Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
07-05-2016, 11:18 AM   #1
Veteran Member




Join Date: Jul 2008
Location: Sweden, Umea
Posts: 876
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
Site Supporter
Site Supporter
BigDave's Avatar

Join Date: Sep 2010
Location: Hudson Valley, NY
Photos: Gallery | Albums
Posts: 2,626
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
Moderator
Not a Number's Avatar

Join Date: Mar 2012
Location: Venice, CA
Posts: 10,510
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
Veteran Member




Join Date: Jul 2008
Location: Sweden, Umea
Posts: 876
Original Poster
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
Moderator
Not a Number's Avatar

Join Date: Mar 2012
Location: Venice, CA
Posts: 10,510
Or take a shot of a few candles, LED indicator lights in a dimly lit room.
07-06-2016, 07:01 PM   #6
Site Supporter
Site Supporter
BigDave's Avatar

Join Date: Sep 2010
Location: Hudson Valley, NY
Photos: Gallery | Albums
Posts: 2,626
Inside shots of candles should work well for a test, sparkles on the water should work also.
07-06-2016, 08:02 PM   #7
Site Supporter
Site Supporter




Join Date: Jan 2016
Location: Fulton County, Illinois
Posts: 3,727
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
Site Supporter
Site Supporter
BigDave's Avatar

Join Date: Sep 2010
Location: Hudson Valley, NY
Photos: Gallery | Albums
Posts: 2,626
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
Veteran Member




Join Date: Jul 2008
Location: Sweden, Umea
Posts: 876
Original Poster
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
Veteran Member




Join Date: Jul 2008
Location: Sweden, Umea
Posts: 876
Original Poster
So first filter is Impact sunny and second image is impact snowy
Attached Images
View Picture EXIF
PENTAX K-1  Photo 
View Picture EXIF
PENTAX K-1  Photo 
07-09-2016, 11:01 AM   #11
Moderator
Not a Number's Avatar

Join Date: Mar 2012
Location: Venice, CA
Posts: 10,510
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
Site Supporter
Site Supporter
BigDave's Avatar

Join Date: Sep 2010
Location: Hudson Valley, NY
Photos: Gallery | Albums
Posts: 2,626
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
Veteran Member




Join Date: Jul 2008
Location: Sweden, Umea
Posts: 876
Original Poster
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
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
bag, filters, impact, k-mount, pattern, pentax, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Filters: Filter Holder + Multiple Filters Polarizer + LBS Scootatheschool1990 Photographic Technique 31 01-14-2016 06:02 PM
Age old question Filters or not, not! jamesm007 Pentax SLR Lens Discussion 12 10-23-2013 03:30 AM
Filters, Filters and more Filters SMcGuire45 Pentax SLR Lens Discussion 15 08-21-2012 12:46 PM



All times are GMT -7. The time now is 07:53 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top