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UltravioletPhotography

Filter Transmission Charts #1


Andrea B.

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Here in one location is a collection of transmission charts for the various UV-Pass filters and filter stacks we use.

The Index is at the end of this first post.

 

Note: Our UVIR Filters Sticky has more links to filter sellers, data and charts.

 

If you have a chart not shown here, please post it in this thread or in its own topic. Later I will add it to the Index list.

 

Many charts here have been provided by Uviroptics (Ebay) and UVR Optics (UVR Defense Tech).

Thank you!

 

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Here is a link to the Schott chart making program. You can enter Hoya data also. Or any data you might happen to have.

 

Go to Schott's Download Library at this link: http://www.us.schott...load/index.html

There you will see a drop-down menu from which you should select "More Downloads".

 

You will then see a checkbox list containing the "Optical Filter Glass Calculation Program US".

Check it and a Download button will pop up.

 

Click the Download button to complete the download of a Zip file containing the program.

The Program is in the form of an Excel spreadsheet, so Excel will be needed to open and use it.

 

For more on entering Hoya data, see Post #23 below where I have copied some hints from Ebay Uviroptics.

 

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Here is a link to UV photographer Boon Tang's blog about various UV-pass filters: http://myphotojourne...s-a-comparison/

A nice Rudbeckia is used as a test subject for the stacks.

 

 


 

 

INDEX of POSTED TRANSMISSION CHARTS

 

UV-PASS Filters: already assembled

HOYA Glass: UV+IR as basis for UV-Pass

Made in Japan? Hoya does have divisions in other countries.

See also Stacks below.

Warning: The U-340 in a 1.0mm thickness LEAKS in the 550 range.

THE U-340 (1.0mm) IS NOT RECOMMENDED! Go thicker.

SCHOTT Glass: IR-Block

Made in Germany.

See also Stacks links below.

SCHOTT Glass: UV+IR as basis for UV-Pass

Made in Germany.

See also Stacks links below.

ZWB Glass: UV+IR as basis for UV-Pass

Made in China by Optima and other manufacturers.

Please read warning and notes!! ZWB filter glass varies by manufacturer/vendor. Some ZWB glass has excessive striations or other flaws. Please check the forum discussions for the latest information about ZWB filters and where UVP members are buying them.

UV/IR-Cut

Baader UV/IR-Cut

Neewer Bk UV IR Cut

 

 


 

 

 

GLASS EQUIVALENTS

These charts correlate the manufacturer's names for various filter glass.

Full charts are available at

Some chart excerpts are shown here:

STACKS

COMPARISONS

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Schott

BG3 = UV+Violet+Blue+IR

S8612 = IR-Block

So, BG3 + S8612 = UV+Violet+Blue

 

BG3 (1.5mm) + S8612 (1.5mm)

BG3 (2.0mm) + S8612 (1.5mm)

BG3 (2.0mm) + S8612 (2.0mm)

 

BG3 (1.5mm) + BG39 (2.0mm)

BG3 (2.0mm) + BG39 (2.0mm)

 

BG3+S8612_multi.JPG

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Schott IR-Block

BG38 (2.0mm)

BG39 (2.0mm)

BG40 (2.0mm)

S8612 (1.0mm)

S8612 (2.0mm)

 

irblockers.jpg

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Hoya

U-340 = UV+IR

 

Schott

BG39, BG40, S8612 = IR-Block

 

U-340 (2.0mm) + BG39 (2.0mm)

U-340 (2.0mm) + BG40 (2.0mm)

U-340 (2.0mm) + S8612 (1.5mm)

U-340 (2.0mm) + S8612 (1.0mm)

U340+BG39_U340+BG40_U340+S8612.jpg

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Hoya

U-340 = UV+IR

 

Schott

S8612 = IR-Block

 

U-340 (2.0mm) + S8612 (1.5mm)

U340+S8612_V2.JPG

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Hoya

U-360 = UV+IR

U-360 (1.0mm)

U-360 (2.0mm)

 

Schott

UG1 = UV+IR

UG1 (1.0mm)

UG1 (2.0mm)

 

UG1_U360.JPG

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Hoya

U-340, U-360 = UV+IR

U-340 (2.0mm)

U-360 (2.0mm)

 

Schott

UG1, UG11 = UV+IR

UG1 (2.0mm)

UG11 (2.0mm)

UG1_UG11_U340_U360.JPG

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Schott

UG1 = UV+IR

BG38, BG39, BG40, S8612 = IR-Block

 

UG1 (2.0mm) + BG38 (2.0mm)

UG1 (2.0mm) + BG39 (2.0mm)

UG1 (2.0mm) + BG40 (2.0mm)

UG1 (2.0mm) + S8612 (1.0mm)

UG1 (2.0mm) + S8612 (1.5mm)

UG1_withBlockers.JPG

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Schott

UG1 = UV+IR

UG1 (1.0mm)

 

S8612 = IR-Block

S8612 (1.75mm)

 

UG1 (1.0mm) + S8612 (1.75mm)

UG1+S8612.jpg

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Schott

UG5 = UV+IR

S8612 = IR-Block

 

UG5 (2.0mm) + S8612 (2.0mm)

UG5 (1.5mm)+ S8612 (2.0mm)

UG5 (1.0mm)+ S8612 (2.0mm)

UG5 (.75mm)+ S8612 (2.0mm)

UG5+S8612.jpg

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Having a program at hand is nice, and I'll scout the Schott site later for my copy. However, compiling all charts into a single location is pretty useful as well.
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Here is some information from Ebay Uviroptics about entering Hoya data into the Schott program which is linked in Post #1.

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Hoya data can be entered into the Schott program as I do, however a couple things to keep in mind with Hoya data are these:

 

1) Hoya data has less resolution, every 10nm for most of the graphs span (Schott data has 1nm resolution for most of the span).

 

2) Hoya drops the data entirely in sections, such as the U-340 datasheet (just as an example) shows no data at all from 390nm to 660nm, the result of this is that blue-edge and red-edge slopes are not accurate at points diminishing below the last data provided, 390nm (.24) and 660nm (.04) in the case of U-340.

 

You can see this on a graph when you compare directly to UG11. One could assume that the edge slopes of U-340 are the same as UG11, given all other slopes are the same, other than peak amplitude. Such low transmission data becomes more important on a graph when the thickness is thinner.

Link to Post with the U-340/UG11 chart: http://www.ultraviol...ndpost__p__7827

 

This is the draw back of Hoya data.Schott data provided in the program has no drop-out of data like the Hoya data sheets.

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I've added the Schott program link info to Post #1 and also some info about using the program for Hoya data in Post #23 (just preceding this one).
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  • 1 year later...

UVR Optics (UVR Defense Tech, Ltd)

AndreaU MK-II = UV-Pass

StraightEdgeU = UV-Pass

 

AndreaU MK-II 359FWHM48

AndreaU_MKII.jpg

 

StraightEdgeU 379FWHM52

StraightEdgeUgraph.jpg

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UPDATED: 29 Jan 2020. Added that the warnings apply only to DIY filter stacks.


 

From Ebay and Alibaba, here is some information about dual bandpass ZWB glass manufactured in China. I find several different Chinese optical glass suppliers offering dual bandpass ZWB glass, but note that the Kopp equivalency charts list ZWB glass under the manufacturer Optima.

 


Warning: Chinese manufactured ZBW glass may all not be of good quality. It depends on the vendor. We have user reports of unacceptable levels of striation and pitting. Remember, a small bubble or two *is* OK in either filters or lenses, but other glass flaws like pitting and striations are not.

 

24 August 2021 Update: Recently UVP members are reporting that their ZWB filters perform well and are relatively free of striations compared to earlier reports. But there are still some bad ZWB filters being sold with no chance of refund. Check the forum discussions for updates on ZWB filter glass and where UVP members are buying it.


 

IMPORTANT: The following leakage warnings only apply for use of ZWB glass in DIY filter stacks. Professional manufacturers using ZWB glass as a stubstrate would typically apply a coating to prevent the visible light leaks. Of course, they would also apply an IR-blocking layer or coating also.

 

ZBW3: The 2mm thick dual bandpass ZWB3 glass passes a significant amount of visible light - almost 30% transmission in the violet area. This ZBW3 filter glass could perhaps be for used as a UV+Violet+Blue+Green filter when emulating "bug vision" when stacked with an IR-blocker. ZBW3 in any thickness is not useable in a DIY filter stack for UV-only photography even when stacked with an IR-blocker. The same holds for Hoya UG5 or Schott U-330 glass, both of which are also UV+Violet+Blue+Green.

 

ZBW2: The 1mm thick dual bandpass ZWB2 glass transmits 8% visible as per the specs below. This is too high for a UV-only filter, so ZWB2 (1mm) is not useable in a DIY filter stack for UV-only photography even when stacked with an IR-blocker. Look for a thicker version and check its transmission chart for visible leaks before buying to use in DIY filter stacks.

 

ZBW1: Like the Hoya U-340 or Schott UG11, the ZBW1 also leaks some visual light (mostly green in the 550 nm range?) up to 1%. This will of course affect UV-only photography. We do not have any comparative examples yet showing how much and what kind of effect there is from the green leak. To effectively use ZBW1 for UV-only photography in a DIY filter stack you would need a much thicker version than 1mm and you should stack it with some type of IR blocker.

 

Other thicknesses of ZWB filter glass may improve these transmission characteristics?

 

Note that the transmission peaks of this filter glass, as is the case with Schott or Hoya filter glass, may be shifted to the right when you stack it with some kind of IR-blocker made from blue-green glass.

 

zwb_trans2.jpg

 

ZBW_Trans.jpg

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