One can often figure out the glass type from a combination of the curve, mass, and optical data. By measuring the curvature and the thickness of the a lens one...
... I have offered a few times to have an analysis done if anyone ever has a small piece of a broken lens (God forbid). I receive glass analysis results for 8...
Glenmore; I saw the original post in full and retained it in the Burgess group daily summary this morning. I tend to disagree with you as in this case Burgess...
I am just a bystander here for the most part, being quite happy for now with my excellent but rather colorful f/9.3 5" achromat. I am constantly amazed by the...
It's the old story of tis better to be poor and happy. A guy buys a $500 Orion dob he's thrilled at the views. Five years later he decks out $1k per inch of...
... decks ... It may also be that after years of looking through the eyepiece by himself, he decides to do some imaging in order to share his experiences with...
I got my Burgess 65ED working. It was an interesting project. It gave me a better appeariansion for the sensitivity to element alignment and the problems that...
Sure, there is THAT (automated observing and imaging). But really: some of these things that turn into matters of religious assertion, such as what has the...
It is common knowledge that those of us with poor eyesight can often do better by peeping through the forefinger and thumb held closely together; or looking...
... sky. It may be that you are confusing color with chromatic aberration. A lot of people use the term "color" when they actually mean to say chromatic ...
Higher Oil Prices Long Term May Impede Global Growth By SUDEEP REDDY January 2, 2008 3:29 p.m. [long cut] "If gasoline prices go up, that means less to spend...
Actually Roland, the posted question was, why are refractor owners so prone to these long litigious debates over their intruments. My reply, which addressed...
Thank you. This is a good explanation, and one that (unusually, for me) I was actually aware of. My point was rather different, which is that it is a...
Spectroscopic analysis is offered by http://www.ultraflat.com/new.htm. Bob Caspari a great guy, his team offers this and other sevices and precision optical...
"We're looking at having to raise the prices of our premium refractors," said Steve ... !!!!!!!!!!!!!!!!! just to be on the safe side i checked their web site...
http://www.astromart.com/classifieds/details.asp?classified_id=539670 I thought Teton pulled their ad on Amart? BTW, a blowout is not a sale. By law, a sale...
Ian; I wondered the same thing. The ones they sell at Walmart?! I would note in passing though that the cost of aluminum and copper are up as both metals are...
http://gedas.cc/main.php?g2_itemId=7603 Here's an image of M45 taken with the infamous Orion 102mm f/7 scope. Why the diffraction effect on the stars? Don...
Sometimes too much screw pressure on the element alignment screws can cause this look. Some suppliers use 3 screws and other prefer 4 positioning screws. I am...
Hmm. he says there is no infringement of any kind. "Just to be certain, we have investigated thoroughly the pedigree of these eyepieces(..again!), and find...
Having problems with message search?
Fill out this form to ensure your group is one of the first to be migrated to the new message search system.
