reply to post by Sammamishman
William stuff is mostly ED glass. That said, Trevor Paglen's shots were done off a ED80, but with a good barlow (one of the televue powermates I
The problem with William and most telescope vendors is your connection to the camera will be via a tube. Tak and Borg can be connected with everything
threaded. This is so much nicer in the field, especially in less that idea operation conditions.
Since you have done some photography off a scope, you know that telescopes are designed a little short so to speak. That is, they assume you will have
a prism or mirror diagonal on the back, which much be included in the optical path. For photography, the goal is to get the image onto the focal plane
(i.e. camera sensor), so the extra path is just "air". For most scopes, that is a tube with screws to hold it tight. For Tak and Borg, that is a
threaded tube. In a panorama, you do not want the image to twist as you pan, so having everything tight (threaded) is very useful. In addition, Bord
has oversize T-rings and threaded tubes, which minimizes vignetting.
Borg makes threaded tubes that also fit Takahashi. My recollection is they say Tomy on them, which means Borg is reselling them, or who knows. In any
event, everything is nice and snug. You can even insert 52mm threaded filters in the optical path. Ted at Hutech is the guru for hooking this stuff
I have no first had knowledge of Borg telescopes, but they use a fluorite element, which is better than just ED glass. That Borg 71 might make a
decent Tikaboo scope now that the Tak FS78 is no longer made. It is a bit short on focal length though. You would probably not be able to get a decent
image with a Televue Powermate, but would have to go eyepeice projection or use a Baader flatfield, and I suspect you won't like the current price of
the flatfield. If you went Borg, I'd check with Ted if you could use the Takahashi TCA-4. It is really tight. The one thing I haven't tried is the
Takahashi eyepiece designed for projection. I have used University Optics orthoscopics for projection. OK, but not as good as a powermate.
You can buy/trade all these little optical accessories on Astromart. It is like ebay, but only for astronomy. I think they charge to join now, but the
fee keeps the riffraff out.
One experiment you could try is to use a good camera 2x telecoverter plus those extenders used for macrophotography on the back of the teleconverter.
To some degree, you can add more space at the back of the barlow to get additional magnification. Nikon has a bit of an edge on teleconverters, albeit
at a premium price. Nikon 301 teleconverters are constantly on ebay, and they are very good. I shoot Canon EOS, but I think for a telescope, you could
make one work with adapters.