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    Sticky: Re: How to Value LF Equipment

    Test examination needs also a look for stress induced birefringence or in german Spannungsdoppelbrechung. This test is very simple and very necessary for longer focal lenses like Dagor-(Protar,...
  2. Re: Is there interest in retrofocus-optics for 4x5 5x7 Graflex from existing len...

    Nodda Duma :

    You write - A methodical approach would be to characterize the aberrations in the lens subgroups being tested.

    This was once my ability, Zeiss ask me once in around 1990 to...
  3. Re: Is there interest in retrofocus-optics for 4x5 5x7 Graflex from existing lens pa

    Dan Fromm and Nodda Duma :

    Thanks for datas. At first is my interest to collect informations about adapters - there is the cheap mass-market and the expensive market like Cine-Industry and...
  4. Re: Is there interest in retrofocus-optics for 4x5 5x7 Graflex from existing lens pa

    Something here seems not to compute. According to the bible, 10th edition, the Graflex SLRs with the shortest flange-focal distance are the RB Ser. D and Super D, both at 6 3/4". It isn't clear...
  5. Re: Is there interest in retrofocus-optics for 4x5 5x7 Graflex from existing lens pa

    Nodda Duma wrote on 10-Feb-2015, 22:09 here in this forum :
    edited the thread title to clarify this is a build-your-own-lens project.
  6. Re: Is there interest in retrofocus-optics for 4x5 5x7 Graflex from existing lens pa

    Oren:

    infinity-distance last glas-surface to screen is s'F'
    s'F' without converter 142,5mm, flat field, vignetting starts few mm before 5x7''
    s'F' with converter 148,5mm, flat field, vignetting...
  7. Is there interest in retrofocus-optics for 4x5 5x7 Graflex from existing lens parts

    The lens-collectors here and lens-designer will know the old wideangle-aplanats or other aplanats with their heavy astigmatism, so much koma sometimes (I mean the older before 1890, not those, which...
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