rf-design

rf-design

Lives in Germany Germany
Joined on May 30, 2011

rf-design's recent activity

  • Bill, if the 13 bad pixels, as shown in the map with unknown criteria, are corrected in the raw, then it should be possible to identify them. The substitution algorithm could be read reverse. So ...
  • For me this thread is very informative. From the difference between what is considered as a bad pixel by Bill's test and the calibration routine which generate a "bad pixel" map someone could guess ...
  • Hi Mizzo, this forum is about Sigma cameras. Nevertheless i have the older F2.8/24-70mm DG HSM and found similar things. I would say that the blur is unpleasant . I think it is because of the lens ...
  • lol export restriction for cut-off the ir filter
    if they use a RGIB bayer it would make sense to notice

  • Shure Scott, stopped down above F5.6 most lenses will get diffraction limited. So there is no big difference to older M42 beside contrast. Today multi-coating is 10x better and allow 20 lens ...
  • Matched performance wise the zooms Art 1.8/18-35mm and Art 1.8/50-100mm I have both and only the 18mm is little soft in the corners. But there is no APS-C zoom with the same performance. For a ...
  • Replied in MC-11 Adapter
    On my A7M2  all HSM objectives, which are not Art or C, are faster on the Sony than on the Quattro SD. On the Sony Nex-6 some objectives are pumping and with false focus. So it seems it depend ...
  • Replied in Sigma SA Mount
    I bought 3/4 of my SA lenses used to significant less than in other mounts. Typical used SA lenses get rare after Sigma decide to left the mount. They state that all new DSLR, not DN, lenses get a ...
  • Created discussion thread Silkypix SD1/SD1M Support
    I have an old version of Silkypix which support only up to SD14. I am interested in an upgrade but found that Quattro is supported but not Merrill. Is that true or an typo?
  • I had a 30D and 40D in the past and remember not using my 90° viewfinder extender which match all optical viewfinder Sigma models, SD9/10/14/15/1M. The 90° viewfinder extender which I use is an ...
  • Some time ago a made AF test with the SDQ on all lenses. The AF performance of the SDQ improves with the 1.05 version. The AF capability with the MC-11 SA/E is similar on the Sony Nex6 (APS) but ...
  • Peter, if the last optical element of the lens is more than about 44-48mm from the image plane the lens could be used for DSLR's and Mirrorless. Shure there is a price in lower performance if you ...
  • A 24MP in crop-mode is 10.67MP. My guess is that FFF take a little longer. So a new APS-C cam from Sigma? Take a SD Quattro, cut off the barrel, exchange the electronics, voila a new Sigma.
  • The diopter range is not negative enough for my near-sight w/o glasses. With my first SLR Minolta XD-7 I use diopter clip-ins. But these restrict the viewable area too much. Later I enjoy the ...
  • Who knows. From the side image it seems that lens construction is not limited to mirrorless. The L-mount only 2x converter extend deep into the telelens! This could mean that a teleconverter is ...
  • Replied in New rant!!
    yes I am not fluent in DNG metadata containers but it make only sense if there is enough info to built algorithm specific for X3F which is in this case only a different package for the same RAW. Ye ...
  • https://www.sonyalpharumors.com/sigma-100-400mm-f5-6-3-dg-dn-os-lens-specs-leaked-costs-949/
  • I guess a DP2 Quattro with a hood with two slots.
  • Replied in New rant!!
    I think there is a good reason why the DNGs do not have the same capability as the X3Fs. The problem is with the physical sensor which is different to all bayer based RAW options. The Foveon is ...
  • I have made a comparison of 4 X3F raw processors in 2017 https://www.dpreview.com/forums/thread/4173523 with a low light image from a SD14. The result was that all 4 show different results in 1. ...
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Last upload Mar 31, 2015