Ken Strain

Ken Strain

Lives in United Kingdom United Kingdom
Joined on Sep 22, 2012

Ken Strain's recent activity

  • There is a photo in my gallery. I'll delete it in a week or so.  Sugru comes in black too. Ken
  • Replied in GX7 or OMD10?
    That's true - though I'd never have noticed as my GX7 is always in 4:3 mode. The GX7 is warmer at default settings, with the same white balance settings as the E-M10. But then it seems to me that ...
  • Replied in 400/4.5
    Hi Danny, indeed it looks like the 600 and 800mm FD lenses both have their exit pupils at least as distant as the 400.  I use the lens with Speed Booster on my EM10, and there is only a hint of ...
  • No - proper fit here to several MFT cameras, just like a lens. Ken Edit - just read your odd (IMHO) post on the Sony forum - it is not clear if you mean Speed Booster (as above) or adapter (as in ...
  • Replied in GX7 or OMD10?
    This question seems quite common, possibly because of how similar the two cameras are - I posted my opinion here and have continued to use both since. The sensors are really very similar, I'd be ...
  • Commented on 400-45_vig photo in Ken Strain's photo gallery

    Image from Canon 400mm/4.5 at f/4.5, infinity focus, on original Speed Booster for E mount. Neutral profile, contrast boosted by about 50%, resized to 50%, saved as medium quality JPEG.

  • Replied in 400/4.5
    Hi Danny, It was on an a6000. I'm sure the effect is due to the exit pupil location and the Speed Booster's aperture. I am sure there would not be any vignetting with a plain adapter, or with a ...
  • Replied in 400/4.5
    A few points about that lens, mainly relating to Speed Boosters The 400mm/4.5 SSC is one of the few FD lenses with exit pupil location outside the recommended range for the Speed Booster (50 to 100 ...
  • Replied in Other.
    I picture a cone extending from the entrance pupil to where I think the point of focus should be.  Then I choose the aperture to get the required depth (my imagined cone shrinks until all the ...
  • These two cameras have far more similarities than differences. Recently I've been using both. I should say that I don't do anything remotely like action photography, so can't comment about focus ...
  • My E-PM2 results looked very much like Christof's to the extent that it matched his better than I think the two E-PM2s that I had previously tested with accelerometers would have matched each ...
  • Hi Anders, there was nothing stamped on any of the parts I could see.  While it shared some features with the illustrative shutter shown in the Copal patent which I recently cited, I found a ...
  • Hi Anders, one more point came to mind. We both found that supporting the camera below the shutter helps a lot.  At first I used a monopod (on the ground or even just held without extending the ...
  • Hi Anders, That's my guess, until I see video or other evidence that suggests otherwise. I don't know.  One guess would be that the design has been over-simplified, eitheras a result of measures ...
  • Yes, and I'd have thought sales were low enough that Olympus would rather have you and other sophisticated camera users happy, but it appears that I am wrong. That is a very good point, and I ...
  • I tried to find out a little more about shutters. There are several patents that illustrate design aspects that appear to be present in the Pen Mini shutter. US4346977 shows an arrangement of pivot ...
  • Hi Anders, I agree entirely. I was quite surprised, but am almost certain that they are plastic foil. They feel like plastic: very floppy, soft and not very springy, they don't crinkle or buckle, ...
  • Hi Anders, I agree with the gist of your argument, but there may be other factors at play. This might be as good a time as any to mention that I had a quick look at the (broken) shutter of an old ...
  • Hi Anders, My 45 was not one of the really good ones as it needed stopped down to f/4 (and the problem was not just a tilt).   I never really got to like it as I've always preferred focal lengths ...
  • The 60mm is an amazing lens, the Lenstip and DXOmark (acutance) results seem fully justified, based on what I see with mine, relative to other excellent lenses. I tried a friend's 75/1.8, but ...
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