jsmiller

Lives in United States Santa Cruz, CA, United States
Works as a Astronomer
Joined on Jan 6, 2005

jsmiller's recent activity

  • Regardless of what you call it, it is either a sensor fault or associated electronics fault affecting the readout of a several rows as others have said. (It is probably not appropriate to call it ...
  • By sharpening I assume you mean sharpness, how sharp the picture looks and not how well it responds to PP sharpening. It looks to me like focusing accuracy, not lens performance, is the major ...
  • The term "better" is not very specific, but my T2I does show more detail at the center than my 5D III with the same lens and settings. The reason is straightforward. The pixels are smaller on the ...
  • Every camera design is a result of tradeoffs, so what appeals to one person may not to another.  I have both these cameras, and I find the EVF on the Pen-F to be much better, closer to what I see ...
  • Many years ago, when making some very high speed astronomical observations, we noticed that the lights from Los Angeles to San Diego were all in phase in their flickering. This was not a surprise, ...
  • But the fact that the bands look almost completely uniform across object boundaries and virtually the whole frame argues against this.  There are other very curious features.  For example, the ...
  • You would need just two flickering sources interfering, maybe the Christmas tree lights and another source already there. This is just a long shot, a wild guess. Another even longer shot is if ...
  • I think this is the best explanation. One way that you would see it only rarely and only part of the time is if there were two flickering light sources at almost the same frequency. Most of the ...
  • These artifacts have a few possibilities that can be investigated with further tests. I find it very interesting that the banding patteren is rather similar on all the exposures, but occurs in ...
  • That's an excellent question. Diffraction isn't simply a lens aberration or some artifact of the digital camera, but a result of the wave nature of light. It cannot be avoided, and it is not ...
  • Replied in PEN-F or EM-5
    I have an original EM-5 and recently bought a refurbished Pen-F from Olympus at a great sales price. (First, thanks to Forum posters for alerting me to this sale. The camera looks pristine, and ...
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Total messages 822
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Last post 3 weeks ago
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Last post Mar 1, 2016
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Photos uploaded 12
Last upload Dec 30, 2011