Terry Posted December 7, 2018 Share Posted December 7, 2018 Why is there not much information on Minolta lenses for use in UV photography - is there something I'm missing? I have quite a few Minolta's from the years gone by and they seem to work great on my Sony.I have just purchased a Minolta 100mm f3.5 macro which is not as good as the f4 but is a quarter of the price. Haven't been able to test it with UV yet as I need a 55 to 52 step down ring but it doesn't seem too bad in FS. Attached photo taken with the Minolta 50mm f1.7 on a Sony a5000 FS TV1/5 AVf2.8 ISO400 Kolari Vision UV filter Link to comment
Cadmium Posted December 7, 2018 Share Posted December 7, 2018 Looks good, but it looks like you have a possible light leak, on each side, the fuzzy/fogginess shows up in background dark areas, vertical bands on each side.Also, your white balance could be slightly different, with more gray/black foliage, would be the norm, instead of the violet/purple foliage, it should be gray. Link to comment
Terry Posted December 7, 2018 Author Share Posted December 7, 2018 Thanks Cadmium, I must admit I was shooting IR so WB was set for that.Will give it another bash :) Link to comment
Andy Perrin Posted December 8, 2018 Share Posted December 8, 2018 Can you get any false yellow? Link to comment
Terry Posted December 8, 2018 Author Share Posted December 8, 2018 in camera or in PP? Link to comment
OlDoinyo Posted December 8, 2018 Share Posted December 8, 2018 I have the 50/1.4, the 35/2, and the 24/2,8 "beer can" lenses. They are reasonably good for visible photography, but their UV bandpass and sharpness are notably inferior to the lenses I have accumulated for the purpose, so I tend not to use them for that. That is not to say they cannot be used, just that there are reasonably-priced alternatives that are better for UV. Link to comment
Cadmium Posted December 8, 2018 Share Posted December 8, 2018 There would be no UV yellow in that scene or that flower... I have a Rokkor-TC 100mm f/4, which as I recall transmits UV quite well, but I can't find a Sparticle test of it, I will make one later tonight and post it.I know it isn't really in the same ball park as a 50mm and such... but does UV well, if I am not mistaken, will test it later and share.It is a nice little 100mm, I should take it out for a spin sometime soon. Here is a really old pre-Sparticle UV test, the green dot is 340BP10. Link to comment
Terry Posted December 8, 2018 Author Share Posted December 8, 2018 Thanks for the input - I have no idea what a sparticle test is so please enlighten me. (I am assuming its some sort of variable test to check bandpass?) Definitely have an issue with light leak which I hadnt noticed with the IR (much higher shutter speeds no doubt) and it stems from the NEX to MD adapter. I suppose having body and lens of the same brand such as Nikon avoids all these issues. I have a D200 FS but as Im a Canon shooter, I only have one lens for the D200 and seeing how its not the ideal body without live view I had no intention of buying any additional lenses. @OIDoinyo - what are the better alternatives in the same price bracket? What would be the ideal starter lenses in your opinion? In the first image I wrapped the adapter and the second it is open. Clearly this is a huge issue :( Link to comment
Andy Perrin Posted December 8, 2018 Share Posted December 8, 2018 No, any false yellow at all, after white balance. In ANY flower. Not the original. The question was really an oblique way to ask what the band pass is. Link to comment
Terry Posted December 8, 2018 Author Share Posted December 8, 2018 ok, no yellow, cool - I'm just not sure what I should do with this info Andy - what does it mean if I get yellow? Link to comment
Andy Perrin Posted December 8, 2018 Share Posted December 8, 2018 Yellow is good. It means you are getting at least less than 370nm. That dandelion looks like you might get yellow if you white balance it. The center should be black. Link to comment
Terry Posted December 8, 2018 Author Share Posted December 8, 2018 I assume you mean something like this?(excuse the focus, it was hand held) Link to comment
Andy Perrin Posted December 8, 2018 Share Posted December 8, 2018 Yeah, I’m not near a computer so I can’t play with it. Maybe? That example looks like it has a color cast also. Are you using a program that can set a UV white balance? Photoshop can’t... Link to comment
Terry Posted December 8, 2018 Author Share Posted December 8, 2018 no I am not, what software would you suggest? Link to comment
OlDoinyo Posted December 8, 2018 Share Posted December 8, 2018 @OIDoinyo - what are the better alternatives in the same price bracket? What would be the ideal starter lenses in your opinion? I have the Asahi 20/4.5, the Asahi 35/3.5, and the Steinheil Cassar-S 50mm as my three workhorse optics for UV (all in M42 mount.) The 35 was very inexpensive when I bought it; the other two were under $300 each as I recall. Some here use the Tamron 20/4.5 as well, but that lens is not as sharp as the Asahi. Link to comment
Andy Perrin Posted December 8, 2018 Share Posted December 8, 2018 I like PhotoNinja but there are other options. I think there is a sticky somewhere. Link to comment
Terry Posted December 8, 2018 Author Share Posted December 8, 2018 This any better in terms of yellows? Link to comment
Andy Perrin Posted December 8, 2018 Share Posted December 8, 2018 Ahah! Yes. That is what it should look like. As an aside, the center looks reddish still, which might indicate some IR getting through the filter? Link to comment
Terry Posted December 8, 2018 Author Share Posted December 8, 2018 not sure, I was under the impression that the Kolari filters let very little IR through? Link to comment
Andy Perrin Posted December 8, 2018 Share Posted December 8, 2018 I would have thought so also, but there shouldn’t be any red here. I don’t know, maybe someone else will have an idea. Link to comment
Terry Posted December 8, 2018 Author Share Posted December 8, 2018 Thanks for your help Andy - I am still looking for an alternative to Photoninja - do you possibly know if The GIMP would work? I haven't used GIMP for years but it was great before I got PS/LR etcThis white balance stuff is doing my head in with all the jargon/abbreviations on here Link to comment
Cadmium Posted December 8, 2018 Share Posted December 8, 2018 Red? That dandelion center looks green to me, similar to a UG5/U-330 stack (UV+Blue+Green).Doesn't look at all red to me.This shot?http://www.ultravioletphotography.com/content/index.php/topic/3081-minolta-lenses/page__view__findpost__p__25008http://www.ultravioletphotography.com/content/index.php/topic/3081-minolta-lenses/page__view__findpost__p__25008 Link to comment
Andy Perrin Posted December 8, 2018 Share Posted December 8, 2018 Yes, and I’m known to be red green colorblind although I only have trouble a small percentage of the time. This may be one of them. So maybe that filter leaks a little violet? Link to comment
dabateman Posted December 8, 2018 Share Posted December 8, 2018 I thought this question was a little odd. I have found this site to be one of the best without brand loyalty.If you find a uv all star lens give us the heads up. Especially if its cheap. If its really good performer best to PM us before the ebay price shhots up :) Link to comment
Andy Perrin Posted December 8, 2018 Share Posted December 8, 2018 Terry, I have no idea about GIMP. If you need a free solution, I think sometimes the manufacturer-provided RAW converters can manage it? Link to comment
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