Quote:
|
Originally Posted by Wally
Lomitus. As far as eye relief goes, you won't find any spec's listed. You just need to keep in mind that short focal ep's will have very little eye relief, while long focal ep's will have lots of relief. Also, as far as eye glasses go, if you're near or far sighted, you'll never have to wear them for viewing thru the scope because you can adjust for your bad vision via the focuser. However, if you have astigmatism, then your out of luck, and eye relief is/will definitely be a concern for you.
|
Most manufacturer's list the eye relief for their eyepieces, some vendors do as well, and you can look some of them up in tables (maybe in Starware, or maybe Harrington has it on his web site), or ask online (a very active group is talking telescopes on yahoogroups). Some styles of eyepieces are advertised as having long eyerelief even in short focal lengths (Televue Radians is one, Orion sells a set from Vixen IIRC, etc.)
I'm near sighted, no astigmatism, but I often wear my glasses for observing for two reasons: if I am at a star party or observing with others, it makes it easier because they would have to refocus if I had it focused for me without my glasses; and sometimes when I'm hunting things down (may not be an issue if you are using autostar) I need to go back and forth between the Telrad, the finderscope, and the eyepiece, and it's extra trouble to keep putting the glasses on and taking them off.
I guess one question to ask is whether the 9mm eyepiece is comfortable to use, if so, then this probably isn't a big issue.