Re: Stellar View binos n' scopes


Message posted by lone wolf on May 07, 2005 at 1:17:40 PST:

APO has become a rather generic term. Generally the good glass has a fluorite element, something I don't see mentioned on the Stellervue website.

For Tikaboo, you really need to limit yourself to about 600mm of focal length because the scope needs to fit in a back pack. Diameter and weight is up to you, but I'd say around 80mm is a good target. The focuser should have the ability to fit 2inch optics if you want to use it "prime", i.e. without additional magnification.

Those mounts shown on the stellervue website won't cut it for good terrestrial photography. You need a geared head, such as a bogen 410 at a minimum.

You need to look at the scope as a system, since you will need some magnification beyond that of the telescope to do a decent job on Groom Lake. You need about 2000mm equivalent focal length at a minimum, which means you need to photograph with a barlow and extension tubes or an eyepiece projection system.

If the manufacturer can't provide a system diagram, I'd be leary. Here are some examples:
http://www.sciencecenter.net/hutech/borg/80b-sys.gif
http://www.takahashiamerica.com/charts/FS-78%20Photo%20Visual%20System%20Chart.pdf

Also check out
http://www.televue.com/engine/page.asp?ID=237
to get an understanding of how these optical systems interact. BTW, I've done comparisons and eyepiece projection with a simple orthoscopic eyepiece is better than a Televue powermate and much cheaper.


In Reply to: Stellar View binos n' scopes posted by Apracticalguy on May 06, 2005 at 22:08:54 PST:

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