David Kieltyka

David Kieltyka

Lives in United States Redford, MI, United States
Works as a Retired programmer/troubleshooter
Joined on Apr 14, 2002

David Kieltyka's recent activity

  • Well, there's more to rendering than OOF quality. The 20mm has a punchy character to it, a combo of color rendition and contrast, that I like. I typically use it well stopped down. Though there is ...
  • My favorite iOS denoiser is the one in Photogene. (The chroma control anyway, which is all I need.) I also use Photogene for much of my iPad pic processing. It can handle 42mp JPEGs from a Sony ...
  • Yup. Lightroom or any other RAW processor that can do lens-specific "corrections." The 12–35mm, as is increasingly the case with newer optics, was designed with software assistance in mind. -Dave-
  • Replied in If…
    The first thing you'd need to do is lose the concept of "crop factor." Once you no longer have a "standard" format (such as 35mm currently) then there's nothing left to factor against. You must ...
  • Replied in If…
    No, there is no "equivalent" field-of-view when you're thinking in degrees. Degrees are format independent. The question becomes: what focal length do I need, with camera X , to get the coverage ...
  • Replied in If…
    …we'd been thinking back in 35mm film days about lens coverage (field of view) in degrees —whether diagonal or horizontal—rather than associating particular focal lengths with particular FOVs, we ...
  • Replied in My minimoog!
    It's old tech and sounds glorious! :-) -Dave-
  • My Zeiss Contaflex SLR lenses won't work either. Some of the lens elements are built into the camera (behind a leaf shutter). Technically that rear section could be duplicated and built into an ...
  • I have two different ones. The first is a Voigtländer and doesn't work with non-focusing-helical 50mm lenses but works great with all others. The second is an Amadeo, which can handle the 50mms ...
  • Thanks, I forgot about the M mount version of the Elmar. Should be well worth the asking price. -Dave-
  • In this case because it easily outresolves the camera's 10mp sensor. And the sensor has no anti-aliasing filter to prevent such artifacts. -Dave-
  • I find with CD-AF that a camera/lens combo will often glitch when contrast is right on the edge of being good enough for accurate focus…but not quite good enough. In such cases the camera can err ...
  • Is this the M mount Tele-Elmar or the earlier screwmount (LTM) version? The older one is pretty darn good…but the later one is really good. I've used my '60s Tele- version on a Sony A7r2 and it ...
  • With my 12mm the focus collar turns freely whether in AF or pulled back MF mode. Of course in MF mode there's a hard stop a bit past infinity. This behavior is the same whether or not it's mounted ...
  • I'll bet video is what they have in mind. I'll also bet this lens design can do AF. -Dave-
  • One of my favorite ways of viewing the Moon is via my 400/3.5 Nikon lens with 2x TC attached and an E-M1 attached to the TC via adapter. I set the LCD for maximum magnification and then enjoy the ...
  • Replied in Yes and no.
    I did, in that I was judging "equal exposure" mainly via the histograms of the pics I took for the test. The Voigtländers definitely vignette at f/2 and faster, which means there was some degree ...
  • Replied in Yes and no.
    Re. Voigtländer…no, the f stop is determined by a physical parameter: the diameter of the aperture diaphragm. "f/1" just means that the focal length (f) and the aperture size are identical. You ...
  • Replied in Yes and no.
    Typically in inverse proportion to the practical significance of the argument. I found it interesting when first trying out the Voigtländer f/0.95 lenses to note the degree to which opening up the ...
  • Replied in Lonely Benches
    This park bench used to offer a lovely view of the lake in front of it. Nowadays, not so much.  :-) -Dave-
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