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  1. R

    Technical Camera Images

    We are discussing the 47XL in the Technical Images thread. It could helpfully be placed in a separate thread.
  2. R

    Technical Camera Images

    In my opinion, the sizes of the image circles given by SK in its 2004 brochure are, with the exception of the oft debated 35XL, a good indication. Surprisingly so, given the subsequent increases in sensor size and pixel count. I haven't tried to determine the IC diameter for myself.
  3. R

    Technical Camera Images

    John, that table is from the Schneider lens brochure of 1995, which introduced the new Super-Angulon XL range alongside the existing Super-Angulon range.
  4. R

    Technical Camera Images

    I understand the desire to simplify the complexity by inserting lens parameters into a single reference table. However, the complexity arises because the lens lines from both Schneider and Rodenstock evolved over time, and at different intervals over time. The evolution of different lens...
  5. R

    Technical Camera Images

    SK introduced its new range of lenses for digital photography at Photokina 1998. The line was called 'Digitar'. The shortest focal length lens of symmetrical design in the line was the Digitar 5.6/47. (The single shorter lens in the range was the Digitar 2.8/28, a retrofocus lens.) As we have...
  6. R

    Diagnosing optical performance problems

    Yes, the total thickness of the aperture blades in their operational overlapped pattern must be (?!) significantly greater than the corrections that we've been discussing.
  7. R

    Diagnosing optical performance problems

    So why did Schneider lower the mount surface of those digital lenses destined for electronic shutters and not Copal 0 shutters? One might posit that enough Copal 0 shutters were within specification to not require shimming. However, surely (?) electronic shutters were made to similar...
  8. R

    Diagnosing optical performance problems

    That's a good workaround strategy to have when we need it. Thank you for explaining it again. I was going to write that I doubt that either Schneider or Rodenstock would have done anything similar to shutters that they found to be oversized, but, well, perhaps they did.
  9. R

    Questions about the hyperfocal distance

    Depth of field marks on lenses were based on an assumed Circle of Confusion (CoC): https://en.wikipedia.org/wiki/Circle_of_confusion
  10. R

    Diagnosing optical performance problems

    I have long been puzzled as to how Schneider and Rodenstock dealt with Copal 0 shutters that they found to be more than 20.025mm deep. When the depth of the shutter was less than 20.0mm, they added shims to bring it into the 20+/- 0.025mm specification. What did they do when the depth of the...
  11. R

    Diagnosing optical performance problems

    Rob, in your last comment, please clarify what you meant by your statement 'because of the higher precision needed'.... Higher than what? Copal 0 shutters? The 20mm depth? Of the calibration required of lenses destined for use with digital rather than film?
  12. R

    Diagnosing optical performance problems

    The 20.0mm spacing forms part of the optical formula. One can wonder how restrictive it became over time to lens designers as they looked for new solutions to increase the image field or the resolution for digital sensors. With the reduced depth needed for only an iris, rather than an iris and...
  13. R

    charging Copal 0 on Schneider 35 XL

    Further thoughts to what I wrote above, earlier: I don't see any 'tiny scratches', as you phrased it. I see a large elongate mark with a diffuse edge that has two or three clearer diagonal bands across it. My best guess is that it's a fingerprint. That would be the simplest explanation. Some...
  14. R

    Ciao from Tuscany! Interior & Architectural Photographer here!!

    Well, it's a delightful image. I have the 24XL in Cambo WRS mount, and in a brief test was surprised at how sharp it is. Your images are full of visual interest.
  15. R

    charging Copal 0 on Schneider 35 XL

    Are you saying that you gave the lens to the camera shop to fix the shutter and it came back with this mark on the lens? The mark on the glass might be an abrasion into the coating, or it might be a deposit of some substance that is resistant to whatever liquid was used. What is the liquid we...
  16. R

    Ciao from Tuscany! Interior & Architectural Photographer here!!

    What a great introduction to your outlook and lenses! Which digital back did you use with the 24XL? Rod
  17. R

    charging Copal 0 on Schneider 35 XL

    I urge caution, as the inside lens surface sits proud of the metal housing and is very vulnerable. If it needs cleaning beyond a blower, I recommend following the method that Schneider itself uses (see below), with a cotton bud (USA: Q-tip) wetted with acetone. The cotton bud allows you to...
  18. R

    Ciao from Tuscany! Interior & Architectural Photographer here!!

    Hi Damiano, Welcome from Australia.
  19. R

    Cambo introduces a new technical camera: the Cambo WRC-490/491

    That body rotation mechanism is the same as used on the WRS 1600. The new innovation revealed for the first time in that video is the rotating digital back adapter. Now that looks slick.
  20. R

    Cambo introduces a new technical camera: the Cambo WRC-490/491

    In comparison, the WRS Cambo DB adapter is listed by Capture Integration at USD 653 (for Phase One) and USD 682 (for Hasselblad).
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