cantaxonpen

Joined on Feb 21, 2018

cantaxonpen's recent activity

  • Created question thread FTZ and Sigma 50-150mm f2.8 OS
    Anyone know if the Sigma 50-150mm f2.8 OS works with the FTZ adapter on the Z50?
  • I currently have the Sigma 30mm Art lens for EF mount, and hate the focus inconsistency I get on my 80D, but on the M50 it's pretty accurate. I just now got the 35mm f2 to use on the 80D, but miss ...
  • I would second the 10-18mm stm; the Sigma 18-35 I never could get consistent focus on 2 different copies, so I would discourage anyone from getting it. Portraits? get a 50mm stm. Street? 24mm stm ...
  • No, AFMA always fixed the problem, but it takes me about half an hour to calibrate each one properly. I just don't have the time or will to do it anymore when the m50 is accurate without the hassle.
  • Created discussion thread AFMA calibration
    I may have started a thread here on this topic years ago, or on a different forum, but after spending hours calibrating focus for lenses on a 90D (just returned it, I give up), I have to ask, how ...
  • Interesting, I just slapped on a 24-105mm F4L II on it for giggles, and the edges are much better. I wonder if it's because of the smaller aperture on the zoom lens? Or is it because of the lens ...
  • Created discussion thread Viltrox EF-EOS M2 Speedbooster edges
    I got a Viltrox speedbooster, and the edge of the frame is a disaster on both my M50 and M3. Anything not in the center square of a 3x3 box is a blurry mess. Trying to AF outside of that center ...
  • looks like the death of the 24fps option on all Canon stills cameras. It's not in the M6 spec sheet, so wonder if the 90D will do without it as well. boo on Canon for their senseless crippling of ...
  • I am not disagreeing in practice because I know it holds. But mathematically it holds because that is only true if the CoC scales down 2x on the MFT camera CoC formula = (Dv / 25) / R / M where Dv ...
  • given, H = f^2/(Nc) + f = f^2/(f/D * c) + f = fD/c + f given DoF = Df - Dn = (s*(H - f))/(H -s) - (s*(H - f))/(H + s - 2f) where f = focal length D = absolute aperture diameter s = subject distance ...
  • which was my initial take. in my example 1. constant 2. solve for 3. constant 4. assuming diagnonals(?) so this should be linear 2x 5. constant solving for 2 would be a 2x decrease in diameter for ...
  • thanks. and I get that. but if I allow print size to fluctuate with AoV given the same pixel density, DoF formula says my equivalent picture given the same perspective and framing requires a ...
  • meaning if you pixel peep cameras with different sensor sizes require the square of the crop factor applied to the fstop? That doesn't seem right.
  • hey guys, I need help getting something straight in my head. Take a 5DS(R) (8688x5792) and take a .5x.5 crop (4344 x 2896). In theory this should be equivalent to a crop sensor with a crop factor ...
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