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07-05-2016, 11:18 AM   #1
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Old filters, Impakt sunny/snowy.

Hi

I got a bunch of filters when I bought a bag of old lenses. I bought the bag for the Pentax k 20mm f/4.0 and the pentax k 85mm f/1.8. What I tought was a Pentax 135 / 2.5 was in fact extention tubes put in a 135 / 2.5 container.

But in the old bag there where these filters. Impact sunny and Impact snowy, the filters are crisscrossed with lines in a repeating pattern.
Are these filters to make a specific pattern on light sources, or are they more like a polarizationfilter. Did a few snapps but couldnt see anything special happening

I also got a Hoya Varicross, this I found information about what it does

07-05-2016, 12:48 PM   #2
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With the cross hatch pattern, it seems as if these may be "Star" filters of various types. Put them on a lens and see what the effect is, before and after. Make certain you are pointed at a point light source (a street light for instance). This is where the effect will be most pronounced. The extension tubes are useful too!
07-05-2016, 09:10 PM   #3
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Screen filters are used for a variety of effects. Star filters work best on point lights or specular highlights and when there is enough contrast against the background to see the effect. Aperture size can greatly affect the results.
07-06-2016, 05:57 AM   #4
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QuoteOriginally posted by BigDave Quote
With the cross hatch pattern, it seems as if these may be "Star" filters of various types. Put them on a lens and see what the effect is, before and after. Make certain you are pointed at a point light source (a street light for instance). This is where the effect will be most pronounced. The extension tubes are useful too!
Sadly its summertime and it gets dark in about 4 weeks here, damn you midnight sun, so no pin point light sources outside. And nothing happens when I point it against the sun. Maby I should take a tripp down to the water and see if it works on reflections.

07-06-2016, 12:45 PM   #5
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Or take a shot of a few candles, LED indicator lights in a dimly lit room.
07-06-2016, 07:01 PM   #6
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Inside shots of candles should work well for a test, sparkles on the water should work also.
07-06-2016, 08:02 PM   #7
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If you try one of the filters and get rainbow flares off of the highlights, then it is a diffraction grating and not a star screen. One with a woven translucent pattern could also be some type of diffusion filter, for soft focus effects.
07-07-2016, 05:35 AM   #8
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This is a fun game, "Name that Filter"! If we had some images to work with, we could have more options or narrow them down!

07-07-2016, 02:22 PM   #9
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Ill do some test this weekend to much football the previous nights.
France vs portugal in finals. Would have been more fun with wales vs iceland
07-09-2016, 10:52 AM   #10
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So first filter is Impact sunny and second image is impact snowy
Attached Images
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PENTAX K-1  Photo 
View Picture EXIF
PENTAX K-1  Photo 
07-09-2016, 11:01 AM   #11
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Nicely defined star effects. I guess the sunny has 8 points and snowy has six (like a snowflake?).

The EXIF says you used a MF M or K type lens. What f-stop did you shoot at?
07-09-2016, 06:56 PM   #12
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QuoteOriginally posted by melander Quote
So first filter is Impact sunny and second image is impact snowy
Wow! I don't know what the idea of the naming convention was, but it seems quite obscure! At least you know they are star filters now!

Now, have some fun with them!
07-10-2016, 03:17 AM   #13
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QuoteOriginally posted by Not a Number Quote
Nicely defined star effects. I guess the sunny has 8 points and snowy has six (like a snowflake?).

The EXIF says you used a MF M or K type lens. What f-stop did you shoot at?
I honestly dont remember, rhis was while drinking drinks on the patio. But i would guess f4.0 on my k 20/4
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