Ken Strain

Ken Strain

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

Ken Strain's recent activity

  • 1) use the acutance measure(such as in the acutance profiles), noting that while it compensates for sensor size it does not do so for pixel count, and completely disregard the perceptual megapixel ...
  • Replied in problem
    I meant that the measurement should be valid up to 100 Hz, which should be more than enough to work out what is happening with IBIS.  I guess the upper unity gain frequency of the control law is ...
  • Replied in problem
    OK, this is the zeroth version of what I'd do, subject to improvement.  I'd make a tilt table, probably with a loudspeaker-like voice-coil magnet arrangement driving a piece of plywood or some ...
  • No to the latter (I thought it should have been a static subject) and I don't think so to the former. If I'd ever used Photoshop I might agree - I know what you are saying. Yes, sometimes I just ...
  • Replied in problem
    I don't remember DNG output as an option on any of the software I have used.   As far as I remember, I've only once used PTGUI directly on raw (actually DNG) files, and that was yesterday for the ...
  • Replied in problem
    Not sure that I can help much.  I've been meaning to study the control laws built into IBIS, but have not had time. A few months ago I looked up some of the MEMS 6-axis sensors that I think are ...
  • For a landscape format image, I usually do the first row (finger under the lens), then briefly put my finger on the side of the lens to set the camera angle for the 2nd row, then back to the ...
  • As with most of these programmes (PTAssembler, PTGUI, Hugin,...) although they started as UIs for Panorama Tools, they have now got most or all of the algorithms for aligning, stitching, blending, ...
  • Yes, indeed. There was some ghost imaging faint, but over large parts of the image as if (perhaps) one of the components had not aligned properly. I'll need to spend more time with the programme ...
  • I took two sets of images of the same subject (though with different lighting, as they were not at the same time). One set was 8 handheld 1/500th exposures at 12mm/5.6 fast burst on EM10 (so about ...
  • Replied in problem
    Nice to know - 63Mpixel should be good. It will be interesting to compare. Ken
  • Replied in problem
    Nor have I thought it through, either, for stacking.  I see how well images can be overlapped using SIFT (which I know is used for stacking too). I don't instantly see why the whole image has to be ...
  • Replied in problem
    OK, my confusion is back as to why it takes so long, I'm probably missing something obvious.  However, you have shown that it is nothing to do with superresolution. That's about the time I'd have ...
  • Replied in problem
    My guess (based on a set of considerations that need not be set out in detail) was that computation would be comparable, but I know more about stitching. From the link you provided, it seems that ...
  • Replied in problem
    Hi Anders, although the initial rumours are very interesting, I've been busy with other things and not had time to look into this topic in much detail. What struck me in reading your post is the ...
  • In case that puzzles someone, it is worth recalling that "mechanical" mode only refers to the second curtain.  The first is always electronic in the GM1.  Also the mechanism is completely ...
  • Replied in Why Not?
    The 'scope test is the gold standard but not everyone has one.  It is EXCELLENT to see initiative as is expressed here, entirely a positive thing. In various amounts, even for the same model.  ...
  • You are getting close, with some clear results: nice!  A few of the shots look either overexposed, or slightly mis-focused or both.  E.g. on the 1/320th GM1 the centre of the stripe is very close ...
  • with the advantage that dust stays out of focus. That's better than mine, that tended to get a bit dusty, and scatter, after 3-4 months. I got a GM1 for the same reasons, for use with wider lenses. ...
  • Sorry, I decided not to keep pictures in my gallery here for a particular reason. Subsequently I have seen inside dismantled PM1 and PM2 cameras. At least in those cameras, there is practically ...
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