Ching-Kuang Shene

Ching-Kuang Shene

Lives in United States Houghton, MI, United States
Has a website at http://www.cs.mtu.edu/~shene
Joined on Jan 21, 2000

Ching-Kuang Shene's recent activity

  • Sorry to hear about this. :-( But, when you are using a heavy lens, the support should go to the lens rather than the camera.  Most heavy lenses have a tripod mount that should be used.  If you ...
  • I have both Z6 and Z7 that can be used with all of my Nikon AFS and AF-P lenses as well as most of my other legacy lenses.  None of the AF adapter from Nikon lenses on a Sony body is reliable ...
  • The word "compatibility" is a little ambiguous here because of "compatible" to what?On the surface, none of the Pentax lenses, whether it is a M42 or PK, cannot be mounted on any Nikon DSLR.  The ...
  • I can tell you one thing as I have both 600mm and 800mm that both are not as good as the made in Japan mirror lenses mentioned in my earlier post.  Furthermore, both Vivitar lenses have a ...
  • I have close to 20  500/8 lenses of various brands.  Here is my assessment: (1) Carl Zeiss Mirotar 500/8 is the best with high contrast and better resolution than the others.
  • Peaking is never accurate.  It is just an focusing aid to tell you that you are close to the place where you will get an accurate focus.  Magnification is a much better and more accurate method ...
  • This is not a particularly interesting lens. But, I am sure that many here may not have heard of this odd lens before. This is a plastic lens of one element. Whether this is a doublet is doubtful. ...
  • I am traveling and do not have any longer than 300mm lenses with me. But, I do have some moon shots posted here before. Hope this is qualified to answer your question and talk to you. OK. The ...
  • Images were sharpened way too much.  As a result, halos are everywhere.  Do you have images that were not sharpened as much, say set to normal or neutral? CK
  • The assumption is that you have these commonly seen little things.  If that is the case, a Canon 500D is about $100+. I do not have this Vivitar 120-600mm, but I do have a Pentax 135-600mm 1:6.7. ...
  • Replied in Telescope
    Alan, the C90 is not as good as the older but more expensive version of C5.  I have a post on these telescope lenses: Some Test Shots of Four Cheap 1000mm Mirror Lenses but a complete one, which ...
  • Forget about the high ratio zoom lenses as none of them has good enough image quality.  If your budget is around $300, I would suggest an old simple super-telephoto lens.  In the late 60's and ...
  • As shown in your first image there is a M42 to LM adapter between the lens and your camera(?).  If you can screw the lens completely into your M42-LM adapter, it is a M42 lens. If after one or two ...
  • CZJ Tessar 85mm 1:2.8 is an article (in Chinese) about the indicated lens.  Cameras used were Nikon D50 and Pentax K100D Super.  Note that the former (i.e., Nikon D50) was not able to focus to ...
  • While there are some outstanding teleconverters such as Nikon TC-E17ED 1.7X, none of the wide angle converters that I have impressed me.  In fact, the wider a wide converter is the worse image ...
  • Replied in Favourite lens
    Yes, it is better than the Spiegelobjektiv 1000mm 1:5.6 fro the East.  I have a post here briefly reviewing the East version.  According to Carl Zeiss' MTF charts, the Mirotar 1000mm 1:5.6 is ...
  • The 200mm 1:2.8 APO is a Minolta lens. You may blame Minolta for lying and praise the Chinese for their APO design. On the other hand, from what you replied to my posts here and elsewhere I do ...
  • I do believe you have had a Canon 200mm 1:2.  Don’t you? I’d like to have the Canon 200/1.8.  The major issue is that I have already had 3 200/2 lenses, getting another 1.8 seems to be more than ...
  • OMG $700 for a 200mm 1:4 APO MF lens, when a Minolta AF 200mm 1:2.8 APO can be obtained for about $500.  Additionally, this Minolta lens has length 135mm and 790g. People usually falls into the ...
  • Nothing special.  Just wished to show the quality of the lens at closer distance and at infinity.  Only minimal exposure adjustment was applied. f/8 f/8 f/3.5 I am evaluating this Travegar 75mm ...
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