Page 1 of 5 123 ... LastLast
Results 1 to 10 of 47

Thread: Using Behind the Lens Filters

  1. #1

    Join Date
    May 2014
    Posts
    50

    Using Behind the Lens Filters

    I recently acquired a Calumet/Xenophone behind-the-filter holder for my 8x10. It fits a 3" square gel filter. I have a 14.75" Caltar lens in an Ilex #5 shutter. Not a lot of documentation about mounting these filter holders. I've read everything from Velcro to double side tape to clipping it on. And I notice the three clips have screws but I have no idea what they're for. I was able to just use the tension of the three clips and fit it around the rear barrel of the lens inside the camera. It stays in there but doesn't feel quite right.

    Also, having a filter inside the camera isn't really conducive to quick changes or adjustments. I do studio portrait work, and if I'm doing a lot of black and white, it can stay in there... I guess. Do people using these typically frame and focus through the filter? Mine is a Wratten #58 gel filter. Everything is green and not as bright in the ground glass.

    Thank you.

  2. #2

    Join Date
    Sep 1998
    Location
    GA
    Posts
    11,292

    Re: Using Behind the Lens Filters

    You must focus through the filter since, besides other adverse effects on the image, it will also create a focus shift. Filters belong in front of the lens unless they are part of the lens design.

  3. #3
    Randy Moe's Avatar
    Join Date
    Dec 2011
    Posts
    9,847

    Re: Using Behind the Lens Filters

    https://www.bhphotovideo.com/c/produ...pter_Ring.html

    https://www.keh.com/shop/large-forma...der-27551.html

    Rare

    I once bought a lens on a Sinar board with a DIY setup, which I removed,

  4. #4

    Join Date
    Apr 2013
    Location
    Kelowna, British Columbia, Canada
    Posts
    505

    Re: Using Behind the Lens Filters

    I have the filter behind my lens quite often, and have never had an issue while focusing through the filter

  5. #5

    Join Date
    Mar 2002
    Location
    now in Tucson, AZ
    Posts
    2,554

    Re: Using Behind the Lens Filters

    The Xenophon BTL filter holder sold by Calumet was designed for the Schneider 121/8 (or 120/8) Super-Angulon lens. Gaffer tape has held mine in place for over 20 years. Not, perhaps, the most elegant solution, but few people have ever seen inside any of my cameras.
    When using that lens I choose the filter first (Kodak Wratten gels), install it, and then focus. Never a resolution issue yet.

  6. #6

    Join Date
    May 2014
    Posts
    50

    Re: Using Behind the Lens Filters

    Thanks everyone. For now, I just have it sort of clipped to the rear of the lens as shown. It's snug, but I don't know if it's the intended way to mount it.
    Click image for larger version. 

Name:	lff.jpg 
Views:	33 
Size:	115.0 KB 
ID:	180413

  7. #7

    Join Date
    Dec 1999
    Location
    Forest Grove, Ore.
    Posts
    3,463

    Re: Using Behind the Lens Filters

    Quote Originally Posted by Bob Salomon View Post
    You must focus through the filter since, besides other adverse effects on the image, it will also create a focus shift. Filters belong in front of the lens unless they are part of the lens design.
    Gell filters are so thin; would the focus shift involved really be that much of a problem?

  8. #8

    Re: Using Behind the Lens Filters

    Quote Originally Posted by neil poulsen View Post
    Gell filters are so thin; would the focus shift involved really be that much of a problem?
    I very much doubt it.

  9. #9

    Join Date
    Oct 2015
    Posts
    523

    Re: Using Behind the Lens Filters

    Quote Originally Posted by neil poulsen View Post
    Gell filters are so thin; would the focus shift involved really be that much of a problem?
    I've used gel filters behind the lens on my 8x10 for 30+ years and I've never noticed any issue with focus shift. Can't say I've tested with/without side-by-side, but I would have had I noticed anything unexpected with my negs.

  10. #10

    Join Date
    Jul 2016
    Posts
    2,483

    Re: Using Behind the Lens Filters

    Quote Originally Posted by Alan9940 View Post
    I've used gel filters behind the lens on my 8x10 for 30+ years and I've never noticed any issue with focus shift. Can't say I've tested with/without side-by-side, but I would have had I noticed anything unexpected with my negs.
    With a thin gel you won't notice a focus shift, because the shift it is said to be 1/3 of the filter thickness. But if you place a thicker filter (like a Pol) behind the lens then you should be able notice the shift, like bob stated.

Similar Threads

  1. Filters behind the lens...
    By Lawrence Francis in forum Lenses & Lens Accessories
    Replies: 7
    Last Post: 9-Aug-2004, 09:53

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •