Richard Turton

Richard Turton

Joined on Dec 17, 2013

Richard Turton's recent activity

  • Be careful about assuming that anything you read about ETTR automatically applies to your camera.  I don't have any OM-D cameras (yet), but I have investigated the often repeated assertion that ...
  • I should have said explicitly that I was referring to read noise after processing by the camera software, as it would appear in the raw file for a dark frame exposure. Your top right graph shows ...
  • Since posting my question about the read noise characteristics of different cameras, I have thought about it more and come up with what seems like a plausible explanation to me. For a system ...
  • I have found your charts to be a very useful source of information on the characteristics of a large number of different cameras.  They are also very well presented.  But can you explain why the ...
  • As I understand it, CCD and older CMOS sensors have an analog output, followed by an analog amplifier with a number of switchable gains used to implement different ISO values, and a separate A/D ...
  • Replied in Woodpeckers
    I unintentionally deleted the EXIF data when exporting these as jpeg's.  They are all ISO 400, f/8, at 1/320 to 1/640.  Since I discovered from testing that the E-5 has only three hardware ...
  • I have done all my lenses two or three times.  I find it difficult to get repeatable results. 50-200  0,-2 (T, W) 50-200+EC-14  -4, -2 12-60  0, -2 9-18  0, 0 70-300  -6, +6 The difference is ...
  • Replied in Woodpeckers
    E-5 with ZD50-200 and EC-14, processed in LR 4.4. Female Downy.  Taken from very close range.  These birds are quite approachable. Male Red-Bellied.  The red eye is very striking. Female ...
  • The male Red-Winged Blackbirds have returned to southern Ontario.  They were probably shocked by the unusually cold weather they found.  The females have not arrived yet.  In any light other than ...
  • The 70-300 is quite soft wide open at 300mm.  Stopping down to f/8 or f/11 produces a noticeable improvement in sharpness.  Beyond f/11 performance deteriorates due to diffraction. Because the ...
  • Replied in Mourning Doves
    Yes it is the ZD50-200+EC-14, recently acquired as a replacement for the ZD70-300.  I have four years worth of pictures taken with the 70-300 that now look quite disappointing compared to those ...
  • Replied in Mourning Doves
    They seem to spend a lot of their time sitting in one spot, feathers fluffed up and half asleep.
  • That plumpness is all feathers and air for insulation.  The same birds in summer look a lot thinner.  And when they are molting, you can see that there is a skinny lizard like creature under all ...
  • I have been seeing a lot more cardinals than usual this winter in southern Ontario (Canada), maybe because the unusually severe winter weather is bringing them out of hiding.  E-5 with 50-200+EC-14. ...
  • Replied in Woodpeckers
    All E-5 with ZD50-200+EC-14. A male Red-bellied woodpecker, a cautious bird that likes to keep its distance and hide behind branches. A rare clear shot A male Downy woodpecker.  These birds will ...
  • One of the reasons cameras switched to CMOS is that CCD sensor readout is too slow for video or live view.
  • I understand that the nominal ISO is just a number chosen by the camera manufacturer to produce what it considers to be the appropriate brightness for a given exposure. I can also see that when ...
  • The 70-300 is a very useful and versatile lens and scores very high on price vs performance.  The AF/MF switch shows that it is not a native Four-thirds design and is thought by some to be a full ...
  • I bought this lens plus teleconverter recently to replace the ZD70-300. Reading this thread ( http://www.dpreview.com/forums/post/52911124 ) helped me in making my decision. I hesitated to sink ...
  • I have been trying to understand the reason for the shape of the read noise and dynamic range curves for various cameras. As I understand it, in the past digital cameras have used an image sensor ...
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