Wed Dec 25 04:00:44 EST 2013 Joseph McAllister wrote: > Takes a lot of time to develop the skills to place an image you want to > capture. Moving the lens to settle on something has you fighting with > having the lens's mirror at a pretty precise 90 degrees from the > horizon. If you tip the lens down a fraction, it goes astray. > > But it's inexpensive, a frustration to use, fools few when they notice > your antics trying to seem to be pointing the lens at something in front > of you while rocking the camera body left and right to find your true > subject.
Joseph, I guess because as Stan pointed out, vignetting forces one to use telephoto (from other PDMLer who are hiding, I heard something like "70mm and up"), I see how aiming can be a challenge. Wed Dec 25 00:36:44 EST 2013 Stan Halpin wrote: > On Dec 24, 2013, at 9:46 PM, Igor Roshchin wrote: > > > > > Stan, > > A mirror is an optical element, isn't it? > > And the quality of mirrors can range widely. > > > > Igor > > > OK, sorry, When I think optics I think lenses. > The mirror in the 90 add-on I had was not very good. IIRC. You would > not be likely to get a sharp image. > I think 135mm was about the shortest lens you could use without heavy > vignetting. > > stan No problem, Stan. Thanks for pointing out about vignetting. Igor
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