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

  • Few months ago, I did a very simple test of four cheap 1000mm mirror lenses Some Test Shots of Four Cheap 1000mm Mirror Lenses . After a big snow storm, here up in the north finally has sun shine ...
  • Actually many legacy lenses exceeded my expectation.  Of course, this totally depends on the "expectation" in one's mind. Asanuma/INA/Soligor/Vivitar 800mm f/8 is an achromatic 2E/1G design that ...
  • There are two very important factors you have to consider: (1) How much would you want to pay? A medium aperture 400mm lens is usually around 1:5.6.  These 400mm lenses are not very light although still ...
  • If I were you, I would bring my Nikon DSLR body with Nikon lenses.  Currently, I use D7100 and D500 for APS-C type shooting.  I would suggest to looking into the possibility of acquiring the new ...
  • I have one. It does not work with AF-D lenses.  It MAY work fine with AF-P lenses.  I need to check this out.  As for AF, Vello can hunt for awhile and sometime incorrectly focues at wrong spot. Ve ...
  • Four factors are in the calculation of DoF: (1) Focus distance - you know it well (2) Focal length - this is the actual focal length rather than an "equivalent" one
  • I do not have many A-mount and Minolta mount lenses because I do not have any modern Minolta and Sony A-mount bodies.  However, I do have couple A-mount lenses I like very much.  Here they are: (1) Min ...
  • Most early Tamron 400mm small aperture lenses such as 6.7 or even 6.9 are reasonable and cheap.  The one I like the most is the Nestar 400mm f/6.9.  The front section can be collapsed into the ...
  • If you use Mac, this does not work because Mac does not have the All key.  So, check here .  But this depends on the font available of that particular application. CK
  • This d is the length of your extension tube.  Note the f is the combined focal length rather than the equivalent focal length.  For example, suppose you add a front mounting 1.7X teleconverter to ...
  • Danny, to do so would require experience.  Not everyone is as good as you are.  I can do it with a AIS 600/5.6 but it requires practice.  When lighting is good, sometimes I could even do it with a ...
  • Not only it is a good bet but IMO a best bet.  It is not possible to hand-holding, and a monopod IS required.  I like it very much more than the heavier 400/2.8 because in terms of portability ...
  • I did a quick calculation and found the following, which may contain some mistakes. If the minimal focus distance of your lens  is u without extension tubes.  Suppose you know the lens focal length ...
  • My setup: Visoflex II/III Komura 500/7, followed by a Visoflex II, followed by a M-to-NEX adapter works properly to more than 1km.  I took this combo for a quick test and here are the two full ...
  • The wife said I could use living room, study room and even bed room for storage as long as I won't invade her quarter.  So, the only issue is that I need $$$$ to fit the space up. :-) :-P Well, ...
  • Tom, I am going to try it later this week to figure it out as we anticipate some good weather soon.  Well, it is still snow packed though.  I normally did not use a setup like that.  I have a Nikon ...
  • Komura 500mm f/7 in Visoflex II/III mount.  It is mounted on a NEX5 with a Visoflex II and a M to NEX adapter. CK
  • I do have some cool combos: A Canon 500D Close-Up Lens mounted on extension tubes, a bellows and a Sony NEX5 Novoflex 400mm f/5.6 on a NEX5.  This one looks like a automatic assault machine gun. As ...
  • Well, a good soft focus lens only have a very slight touch of SA to soften an image.  In fact, most portrait lenses have this built-in as oppose to the macro lenses of the same focal length.  It ...
  • The one you showed is the well-known EBC Fujinon 85mm f/4 Soft.  I have one for many many years.  However, until recent one or two years no M42 adapters can use this lens properly due to a little ...
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