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Hi all, here are some tests with my A7r Full Spectrum and some filters (all pictures just set WB to the asphalt): I am thinking about getting the Kolari UV one. I currently have S8612 and Hoya U-360 and U-330 from UVIR Optics but I am always lazy (as you can see I didn't got them this day to shoot) since they are both 52mm and I use 58mm for everything else... So, please, critics on those pictures (and how to process them properly) and is it good or redundant for me to get the Kolari UV one? Thanks all!!! 4486: Kolari IR Chrome 4488: Kolari Hot Mirror (old one) 4490: Hoya R72 4492: Hoya Orange O(G) 4494: No filter (full spectrum)

I wanted to share my last purchase with you - finally decided to buy $6,539.90 (with shipping): https://www.ebay.com/itm/284638686989?hash=item4245c9af0d:g:vBwAAOSwgiZfXERT Wish me all is fine with that lens Also finalizing buy Fuji GFX 50R monochrome from maxmax.com.

I've been searching for a good walkaround lens to use on my APS-C camera for IR but so far not really any luck. According to Christopher Frost, this lens, while being exceptionally cheap is also rather sharp and doesn't suffer from much distortion or other aberrations, so it piqued my interest. I have already tried the Meike 25mm f/1.8 which according to Kolari was good for IR, but A) it's not, it has a large hotspot and B) the image quality is just dreadful, with a lot of distortion, so I am selling it. I will probably buy it if nobody here knows, but I am asking in case anyone does, as to not waste my money, time and energy. Thanks.

Anybody want to sell? I want to buy.

Lens test with 365 Led Light 365nm (with ZWB2), above is the outline of the set and a photo with nothing lens two good APO lenses covering the 4x5 "format It seems to me that Apo Ronnar is the best (you can find it with and without shutter at a good price)

Has anyone tested these lenses for UV transmission? I'm working on a very tight budget and trying to get a lens with a portrait-appropriate focal length which also covers 4x5 with some room for movements. These are the two options I've arrived at, the latter being a crapshoot given that Dr. Schmitt already ascertained that some of the other EL-Nikkors had very poor transmission. My logic in looking at the Tessar is that it will have the smallest amount of glass within, and thus it may allow just enough in that I could use it photographically. Currently, I'm working with the EL-Nikkor 135mm (which accommodates some movements) and the EL-Nikkor 105mm (no movements possible and only covers the film when stopped down). Is anyone aware of any other lenses I might be able to pick up? It's a delicate selection I'll have to make, given that I won't be able to purchase several and cross-compare given where I'm at financially. I'll include some pictures of my portraiture.

Hi, I wanted to buy some glass for my new 50R - original GF lenses are prohibitely expensive, I may buy them in the future, but for now wanted something cheaper. I have adapters from Nikon and M42 and tried all my Nikkon & M42 glass and they are from bad to medium, especially in wide ange. Normal and teles are already usable from Nikon. So the question is: which medium format has quite fast wide angle lenses that are usable on GFX using an adapter? If I want AF, is this too much? Impossible? From my findings I can see that "smc PENTAX-FA 645 35 mm F3.5 AL" is recommended as a very good wide angle lens. I see this comes in MF & newer AF version. I would like to use AF, but MF is also OK (focus helper is great in 50R and wide angle is easy with MF), is there any good P645->GFX adapter that supports AF, if not then which MF adapter is recomended? Or maybe which medium format system has a biggest number of good wide angle lenses and have GFX adapter for it? Last, strange question, I was looking for some kind of database for 35mm lenses image circle sizes (even only for Nikon) and I couldn't find any... I mean this is just a technical parameter - image circle size, say at infinity. I can find a lot of such data for medium & large format, but not for 35mm - Am I miss something? Anybody knows some page that list image circle sizes for 35mm lenses? Is this because all of them are supposed to cover image circle 43mm so not worth saying image circle size? From my initial research on 50R they differ *A LOT* even in Nikon lenses...

Hi Everyone, my first post on this forum, thanks for all your posts that have been very inspiring and special mention to Iggy and Enrico for many tips on camera and lenses that I ended up using. I am a biologist working on butterfly genetics and my team got interested in the study of UVA-iridescence, we published that work here: https://doi.org/10.1073/pnas.2109255118 (this article will be open-access shortly, in the mean time you can browse the main findings here : https://twitter.com/evolvwing/status/1480660574614740994 ) At that time I was happy enough with a reverse-mount El-Nikkor 50mm mounted on belows, and also used a Nikon CFI Plan Fluor ELWD 20x 0.45 DIC L Ph1 DM at some point. I now managed to put my hands on a Mitutoyo M Plan Apo NUV 20× / 0.42, and I was very impressed by the Working Distance and transmission for my specimens. I have not tried it with stacking yet, and should get more tonal range with better light sources, but this is very satisfactory already. I was also very happy to see no vignetting using the El-Nikkor 105mm f/5.6 as a stacking lens, although of course you would need a longer lens if you use sensors larger than the Lumix micro4/3 format. Dimensions : each scale on the image has a vertical width of 80 um. Note: careful on eBay, most items sold as Mitutoyo M Plan Apo NUV 20× appear to be counterfeit. I have a certificate on authenticity on mine, and I cannot comment on whether the imitations are decent for this purpose. Arnaud Diagram legend # Lens unit "Micro-UV" 1 Rubber End Caps 32mm(1 1/4-inch) ID Vinyl Round uxcell / Amazon 2 Mitutoyo M Plan Apo NUV 20× / 0.42 ebay 3 SM1A27 Adapter with External SM1 Threads and Internal M26 x 0.706 Threads Thorlabs 4 SM1 female to M28.5x0.6 male thread adapter rafcamera / ebay 5 U Filter (Venus and Ultraviolet) - 1.25" Baader Planetarium hidden / 6 Baader Double T-Filter Holder 1.25" Adapter # T2-31 Agena Astro 7 Female to Female Double Dual Inner Thread M42 and M42 mm Lens Ring Adapter Amazon 8 M34.5x0.5 male to M39x1 male thread adapter rafcamera / ebay hidden M39 39mm to M42 42mm Adapter for 39mm Enlarger Lens /42mm Focusing Helicoid ebay 9 EL-Nikkor 105mm f/5.6 ebay hidden M39 39mm to M42 42mm Adapter for 39mm Enlarger Lens /42mm Focusing Helicoid ebay 10 M42-M42 Focusing Helicoid Adapter Pixco 11 M42 Lens to M4/3 Focusing Helicoid Adapter Fotasy

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I tried the new filters from Tangsinuo with different combinations, I realized that graphs are one thing ... a practical test is much better. I tested the compatible lenses with my Sony A7 full specrtum, with a combination of Jason's new TSN575 + ZWB1 filter ... these are the results. The first two photos are with L. Meritar 50mm f2.9 Flash light 40Watt - 1/125 "- f: 16 - 50iso - QB39 (~ BG39) Flash light 1000Watt - 1/125 "- f: 16 - 1600iso - TSN575 + ZWB1 (the last photo is without UV + VIS + IR filters) then you will have to find out the numbers of ... Leitz Elmar 50mm f: 3.5 (collapsible of my old Leica IIIF) Helios 44-2 58mm f: 2 Nikkor-H 24mm f: 3.5 Nikkor-H 50mm f: 2 Nikkor-D 50mm f: 1.8 Nikkor-D 60mm f: 2.8 (micro) Asahi Super takumar 35mm f: 3.5 Asahi Pentax SMC 35mm f: 2 Asahi Pentax SMC 85mm f: 1.8 I have no photographic lens measuring tools Please ... i await your considerations. Thanks Antonio

I wanted to show you how Atom Nikkor (35/1.4 Ai - thorum glass version) works on Fujifilm GFX 50R. Full res photos are here: https://teststats.cncf.io/backups/atom-gfx-50r/ Note that the center is sharp, but when you go to edge it becomes a bit soft, and when you go to corner it just becomes unsharp. All photos were shoot in 6x7 mode - normal 4x3 mode causes black corners - vingetting is so high, that on f=16 you just see black circle cut off and on f=1.4 corners are almost black. 6x7 is the biggest you can get without hard black vingette on f=16. The best woudl be to use 1x1 square... which requires 46.6 mm image circle. Most were shot using manual focus aid at f=1.4 and then stopped down to f=8,11 (some may be f=5.6 or f=16). Smaller previews here:

Opteka offers an extremely affordable 15mm full format macro lens: https://opteka.com/products/opteka022346 The technical data correspond to the well-known Laowa lens. The Opteka does not have a shift mechanism. The optical performance as a macro lens is surprisingly good in the VIS range. This lens is great for showing small objects in their habitat. Especially compositions with valleys or mountains in the background can be very attractive. The filter diameter is 77mm, the distance to the front lens at 1:1 is only a (few) mm. That's why I rarely use this maximum magnification. Magnifications of around 1:4 are, however, quite practicable. I have now tested this lens with my Canon 6D-FS in the UV. I use a stack of a ZWB2 and two QB21 filters. The thick stack leads to strongly visible vignetting (with only a slim line filter in the VIS, no corresponding darkening is visible). Since I like to crop the pictures to 4:5 or 1:1, that doesn't bother me. With a construction with 12 elements in 9 groups, you certainly cannot expect high UV transmission or deep reach. My own, qualitative measurement shows a recording of the wavelengths from about 370 nm to 400 nm under the conditions mentioned. Sunlight and white balance on PTFE result in yellow false colors up to about 385 nm, bluish in predominantly longer wavelengths. Attached is a photo of Delosperma Lavander, taken in the botanical garden of the Heinrich Heine University in Duesseldorf, cropped to 5:4. In the background the domed greenhouse, the landmark of the garden. ISO 16ßß ASA, 1s, f11 In addition, a 1:1 cut-out. This is how the scenery looks on mobile (28mm FF equivalent).

Last Update: 03 April 2021 agb/label Finalized: Work in progress. Asahi 35mm f/3.5 Super-Takumar Manufacturer: Asahi Opt. Co. Lens Label: Asahi Opt. Co. Lens made in Japan Super Takumar 1:3.5/35 <serial number> Currently manufactured: No Lens type: Manual focus, Prime, Wide Angle Design: 5 elements in 4 groups Focal length: 35mm Aperture range: f/3.5 – f/16, Preset Manual, 5 blades Optimal magnification *: ? Sensor format/coverage: up to 24 mm x 36 mm Mount: M42 x 1 thread**, others. The mount is internally mounted on a T2 mount structure that can be exchanged between lenses Helicoid: Yes Flange Focus distance: M42/45.46 mm, Front filter: 49 mm x 0.75 mm Introduction year: 1959 as Auto-Takumar. With the same optical design for three versions named Super-Takumar, between 1962 and 1971 This lens produced: between 1964 and 1966 (version 2) S/N of test object: 33858 More info, on the web: https://www.pentaxfo...-35mm-F3.5.html Image of test object: Transmittance Summary Definitions of the parameters below Range: This Super-Takumar 1:3.5/35 lens transmits from 1-71% in an increasing slope from 333nm to 400nm. TVISmax (%) = 87% T400nm (%) = 71% T365nm (%) = 47% This high percentage is an indicator for reasonably short exposure time under typical UV-pass filtration peaking around 360 nm or when using 365 nm UV-LED illumination. λUV HMvis(nm) = 363nm λUV HM400(nm) = 356nm λUV Zero(nm) = 333nm These three values indicate that the lens is working well for upper UV-A photography with suitable filters. Spectral Transmission Graphs UV-NIR, Super-Takumar 1:3.5/35 The transmission measurement accuracy into the end of NIR range is less good due to limitations in the light source. UV, Super-Takumar 1:3.5/35 UV-Log, Super-Takumar 1:3.5/35 Numerical Spectra Data available: Pending General comments about the UV-reach: This lens do not have a great UV-reach, but in the most common cases it still can be good enough. If the sharpness is superior compared to other lenses, that might be a reason to use this lens instead of a less sharp lens with better UV-reach. Filters and how to use them on this lens: The front filter thread is 49mm standard filter thread. It is also possible to use rear mounted filters, either in lens mount adapters for mirrorless cameras like Sony A-series etc, or placed directly in the camera. An alternative, if space in the camera allows, is to putty-mount a filter directly against the lenses rear element mount ring. The rear lens element is recessed and thus safe and the ring provides a good reference plane for orienting the filter normal to the optic axis. Handling and focussing: TBD Flare and sun-stars: TBD Sharpness: High according to sources on the web Lens distortion: TBD Chromatic Aberration in UV: TBD

Most UV specific lenses are in the 50-105mm range. Even owners of the UV Nikkor, Coastal Optics, and Pentax UAT have to make do with accidental UV wide-angle lenses. Could a company build a stellar full frame 24mm UV lens? Is it even scientifically possible for a 24 to match the longer focal length UV lenses, or at least a Kyoei 35? Not that a company is likely to do so, but is it technically possible? Thanks, Doug A

Finalized: Work in progress. Last Update: Note: Additional information or links about this lens are welcomed and will be incorporated into the first post as time permits. Soligor 35mm f/3.5 (KA) Manufacturer: Kyoei Acall Manufacturer's lens designation: Soligor f = 35mm 1:3,5 No. KA<Serial number> Currently manufactured: No Lens type: Manual focus, Prime, Wide Angle Design: 5 elements in 5 groups Focal length: 35mm Aperture range: f/3.5 – f/22, Preset Manual, 8 blades Optimal magnification *: ? Sensor format/coverage: up to 24 mm x 36 mm Mount: M42 x 1 thread**, others. The mount is internally mounted on a T2 mount structure that can be exchanged between lenses Helicoid: Yes Flange Focus distance: M42/45.46 mm, Front filter: 46 mm x 0.75 mm Introduction year: between 1969 or earlier This lens produced: 1971 S/N of test object: KA 70028 ** Mount of test object Comment about types of Soligor 35/3.5 (KA): Over the years several different models of this lens were produced by different manufacturers. They have different shapes and optical performance, possibly including different UV-reach. for more info see the first link below. More info, on the web: https://www.apotelyt...soligor-catalog http://www.savazzi.n.../35soligor.html Image of test object: The shape of the rear lens mount shape this lens have, has often proved to be a good hint of a possibly good UV-performance for similar lenses branded differently like Galaxy and Prinz Galaxy Transmittance Summary Definitions of the parameters below Range: This Soligor 1:3,5 f=35mm (KA) transmits from 1-70% in an increasing slope from 310nm to 400nm. TVISmax (%) = 87% T400nm (%) = 70% T365nm (%) = 62% This high percentage is an indicator for relatively short exposure time under typical UV-pass filtration peaking around 360 nm or when using 365 nm UV-LED illumination. λUV HMvis(nm) = 344nm λUV HM400(nm) = 335nm λUV Zero(nm) = 310nm These three values indicate that the lens is working for upper UV-B photography with some filters and the few for this, suitable cameras. Spectral Transmission Graphs UV-NIR, Soligor 1:3,5 f=35mm The transmission measurement accuracy into the end of NIR range is less good due to limitations in the light source. UV, Soligor 1:3,5 f=35mm UV-Log, Soligor 1:3,5 f=35mm Numerical Spectra Data available: Pending General comments about the UV-reach: tba Filters and how to use them on this lens:The front filter thread is 46mm standard filter thread. It is also possible to use rear mounted filters, either in lens mount adapters for mirrorless cameras like Sony A-series etc, or placed directly in the camera. An alternative, if space in the camera allows, is to putty-mount a filter directly against the lenses rear element mount ring. The rear lens element is recessed and thus safe and the ring provides a good reference plane for orienting the filter normal to the optic axis. Handling and focussing:TBD Flare and sun-stars: TBD Sharpness: TBD Lens distortion: TBD Chromatic Aberration in UV: TBD

Some time ago I was contacted by a person who found this lens among his late father's possessions and sent me the attached pictures. I do not own this lens, so I cannot contribute any first-hand information. Information on this lens is notably absent, for example its is not mentioned in Klaus' database at http://www.macrolenses.de/objektive_sl.php?lang (although a copy of a Rodenstock data sheet that includes the UV Rodagon 80 mm is indeed published on his site). This lens is mounted in a re-purposed barrel originally designed for enlarger lenses of the same age, like all other UV Rodagons I have seen. The lens barrel has been custom-modified with the addition of a vent, probably used to allow air passage to the outside of the barrel for using the lens in a vacuum, or alternatively to replace air in the barrel with a controlled atmosphere, for example nitrogen to avoid ozone formation during exposure to low-wavelength UV radiation. This modification also blocks the aperture ring at f/5.6. If the specifications of this lens are similar to those of the other UV Rodagons of the same age and mounted in barrels of the same style, this lens is designed primarily for use in UVA around 365 nm, and is still quite usable at 310-320 nm (with roughly 50% of its peak transmission, which is at 400 nm). It is not designed for ozone-forming UV wavelengths, although of course you might be able to push some medium-UVB through this lens with a strong enough source. The spots around the periphery of the front elements are a typical example of "Schneideritis", caused by black paint lifting off the painted girdle of the optical element. The rusted screw head is a possible indication of use in a corrosive atmosphere, although excessive humidity and/or a defective chrome plating may also result in this type of rusting. I have a page on the UV Rodagon 60 mm f/5.6, which is externally very similar, on my web site at http://savazzi.net/photography/uvrodagon.htm. Other known focal lengths for UV Rodagons are 105 and 150 mm, so at least four different focal lengths were made.

This is interesting: https://www.43rumors.com/panasonic-develops-low-cost-fir-lens/ Steve

I have found a local seller who is willing to sell me a used Viltrox 0,71x speedbooster for Sony E for around 100 euros. I would probably mainly use it for my Sony a6000 when shooting infrared. Does anyone have any idea how much does this speedbooster alter the image quality and if speedboosters cause hotspots in IR? Thanks.

The Kuribayashi 35mm f/3.5 has an M42 threaded mount, 46mm front filter thread, made by Kyoei for Kuribayashi Camera Company (the older company name for Petri). I believe this lens was originally made in 1959, and for a couple more years. This lens is sharp, has exceptional UV transmission, and practically no focal shift. The Kuribayashi 35mm f/3.5 and the Kyoei 35mm f/3.5 are exactly the same. They have the same exact physical build, the same optics, and function exactly the same. Other than varied mounts and the absence of 'black and white' focus ring cosmetics for the Kyoei brand, they are the same lens. Here are some photos I have already, I may add more later. Kuri side and front: Kuri 35mm and Kyoei 35mm in center. Don't be confused and buy the Kuri 35 at the left, it is not good for UV at all: Kuri 35mm and Kyoei 35mm in center. Don't be confused and buy the Kuri 35 at the left, it is not good for UV at all: Kuribayashi 35mm f/3.5, caps, hood, and case: Kuri and Kyoei: Kuri UV Transmission comparison: 5 Kuribayashi 35mm f/3.5 (one in original leather case) and 1 Kyoei 35mm f/3.5 (upper right) lenses archived in Pelican case: Kuri / Kyoei 35mm elements: Kyoei (shown) / Kuri 35mm elements: How front section with 3 front elements screws out: Front three elements seperated: ...and more here: https://www.ultravio...v-transmission/

Trying out lenses longer than the Meyer Görlitz Telemegor 180. I have a few old school long lenses. First lens will be a 500mm that my Hoya U360/Schott S8612 filtration fits internally. My usual go to test is a Dandelion. They are popping up now, but the 500mm lens has a 10 meter minimum focus. Ouch, no macro photos. So this leaves landscapes. What do I look for? Thanks, Doug A

I didn't have time to shoot lately, but today I tried to use my SvBony lens for general UV photography. The main aberration I see is field curvature, chromatic aberration is there but not that noticeable. All photos were somewhat stopped down (like f/4) and taken handheld. Full-spectrum Canon EOS M, ZWB2 (2 mm) + Chinese BG39 (2 mm). In-camera white balance (it was already set). ISO 12800 and 1/30 s exposure for all photos. Some people would say that this lens has character, like a Petzval lens, known for its field curvature. It does have an "artistic" look, if one likes it.

I am wondering whether anyone has this Lavision 85/2.8 lens or has used it? Dr. Klaus has used it: LINK. According to this review - LINK - the Lavision 85/2.8 is chromatically corrected and can reach 200 nm. It is also quite fast for a UV lens. And, as you would expect for a corrected, fast, sharp lens, the price is sky-high. At the Lavision Shop, the price is listed at €12300. Zowie!! Note that this lens is not full frame.

This is a 60 mm f/2.4 lens good for UV: https://www.ebay.it/itm/QUARTZ-Glass-acromatico-UV-60mm-f-2-4-/313902745969?mkcid=16&mkevt=1&_trksid=p2349624.m2548.l6249&mkrid=707-127634-2357-0 I think it's similar to this one: https://www.ultravioletphotography.com/content/index.php?/topic/5266-zeiss-uv-lens-460mm-m42-on-ebay/ I will not buy it, and I don't know how useful it can be.

Stumbled across this on eBay. Way too expensive, but interesting nevertheless. Zeiss UV-Lens 4/60mm for M42 Prototype UV-Lens Zeiss Jena 1960 https://www.ebay.com/itm/265569210761 Steve

Excitingly, I'm finally switching to a better camera system, better for my kind of hobby that is. Canon EF is a great mount but the mirror is too much of a nuisance for me truth be told. I have sourced a nearly new Sony a6000 and when I receive it and try it out, I will be sending it to https://irrecams.de/en/ for a full spectrum conversion. (Bonus question about that, Mr. Sven Lamprecht says he uses a "280nm longpass" for the full spectrum conversion. Has anyone here used his services and can confirm it works well for UV? He has been very nice dealing with me, even going as far as providing a tech sheet for the material (see below) but he says he doesn't know the chemical composition. I don't want to bad-mouth him in any way, just a little nervous about the fact that I don't know what exactly is being used and I can't look up the transmission graph. Refraciitve Index n (587,6 nm): 1.512 Specific gravity ρ (g/cm³): 2.52 Transformation Temperature Tg (°C): 586 Sag Temperature Ts (°C): 656 Mean coefficient of linear thermal expansion α × 10‑⁷(°C): 81 Acid durability DA: 1 Water Durability DW: 4 50 % Maximal Transmission λt 50% (nm): 280 +- 9 Temperature coefficient Tk (nm/ °C): 0,02 Rambling out of the way though. I am wondering what adapters might be the most useful to me as a new owner of a mirrorless camera. I have quickly looked up what eBay has to offer, and I have found three objects of interest. https://www.ebay.com/itm/182743183652 https://www.ebay.com/itm/303699154264 https://www.ebay.com/itm/282595837363 What do you guys think of those? Anything else I should get? My most preferred feature would be if the adapter could be at least 1mm shorter than the flange the lenses were designed for, to allow for better infinity focus in UV. I have ran into issues with this several times now on the EF mount. But any other recommendations I appreciate, budget helicoid rings would be great, any adapters for other commonly used vintage (or even current) mounts, anything that you have found useful for full spectrum and derived shooting. Thanks.