rf-design

rf-design

Lives in Germany Germany
Joined on May 30, 2011

rf-design's recent activity

  • Sorry, I swap for the IRIX lens the center with FF-corner resolution. All further calculation are based on APS-C corner. Thanks for spotting.
  • Her are some MTF50 data from lenstip.com all at F5.6: Center APS-C.Edge FF-Edge Tokina Firin MF 20mm 72lp/mm 52lp/mm 45lp/mm Sony A7R2 Irix 15mm 30lp/mm 42lp/mm 44lp/mm Canon 5D3 Samyang XP 14mm ...
  • Scott, the 32MP APS-C sensor is official. The A7000 with A7 style body, center EVF, 40k60p, zero blackout is rumor based on the capabilities of the sensor. https://www.sonyalpharumors.com/the-full- ...
  • Steve made a very good comparison of a DP0Q with SDQH+1.8/14mm: https://www.dpreview.com/forums/post/62057146 He show to me that 1. The view angle o the SDQH is only marginal wider to the DP0Q at 14mm
  • Please do not fear to send outside UK. You have some days left before HARD BREXIT. :-)
  • I am not so familar with GIMP and look at the manual: https://docs.gimp.org/en/gimp-concepts-layer-modes.html The operation is: E=I-M+128 so a simple substraction in 8bit RGB space with mid-offset ...
  • Are you able to test the Sigma 1.4/16mm and Samyang 2.0/12mm with this mod? I expect the results are far better than actual DP1M  and give an outlook for an L-Mount ILM cam with the 1.4/16+30+56mm ...
  • I do not have the SDQ-H instead the SDQ. The price is about 1.8x and using only full-frame lenses could result in less performance than an optimized new APS-C lens. I did a vigneting check with ...
  • Scott, also for me the versality of the A7R2 is an alternate for SDQ-H. The price is in the same range I would call it. 1329€ https://www.e-infin.com/eu/item/2671/sony_alpha_a7rii_mirrorless_digita ...
  • "more likely" The meaning is that the total resolution is a combination of lens, possible aliasing filter, bayer reconstruction and sharpening. So it is difficult to state would is the performance ...
  • I do not know the Leica series. They have APS-C lenses but my usage is too extensive for the price. I got very interessted into the F1.4 APS-C prime series. I already have the F2.8 19/30/60mm ...
  • Created discussion thread Foveon APS-C L-Mount Camera
    Would be nice to have a compact APS-C Foveon sensor based camera with L-Mount and the 1.4/16+30+56mm series. " Do Sigma and Panasonic see the L mount as an APS-C mount as well? Are you planning on ...
  • Sharing spectral evaluation results is a good thing. The required hardware should be as easy and appropiate as possible. There no doubt about this intention. To compare different ways to achive ...
  • Right, the sphere serve to reduce incidence angle problem, or inaccuracies with the measuring setup. I am interested in incidence spectral sensitivity difference resulting from interpixel, optical ...
  • "2.5" integrating sphere and several distinct components" 1. Sphere opening diameter? 2. Distance to sensor? 3. Intermediate apture? I am locking here: https://github.com/Alexey-Danilchenko/Spectron ...
  • That could only mean that Sigma copied the hole protocol and message fields from the Canon-EF to use in there own SA-mount electrical interface. Or is there a protocol converter, small integrated ...
  • Given the avaibility of LEDs from UV to IR and not needing high power densities of arc lamps you can simplify the setup. If Alexey is measuring with lens and have to use a small apture to narrow ...
  • Understanding the design design decisions. I think you refers by parts to different positions and incidence angles on the sensor and not the different parts of your setup. "With the precise ...
  • The reason for question was to understand the underlying decision to use the monochromator+sphere approach. The question is why this approach are used instead of a some different others. All will ...
  • Could you explain why for final spectral response measurement of photographic sensors not a simple solution is prefered by using a concave diffraction grating . Regarding accuracy the spectral ...
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