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telescopes@yahoogroup...
Mar 1, 2008 8:48 am
131944
HI, I'm new to the group, why don't the astronomy clubs like the green laser pointers??? Thanks ... use the finder scope to zero in. Just be aware some...
I an installing my LX200GPS 8" on the top og my vand with a Dome and a complete Amateur radio station to use for the summer at the Boy Scout camp. I will send...
1) To insure no laser beam accidentally in eye ruining night vision 2) To remove the possibly of green beams ruining long exposure astrophotos. 3) Some feel...
... At the recent Winter Star Party down in the Florida Keys, for many years, the staff & attendees of the WSP do not like them at all, and have totally...
Well I'll just be using mine in the back garden and there was me just worrying about my neighbours! Lol, still I'm gonna use it, I thnk they are awesome. Andy ...
... But, if he gets lucky and the seeing is o.k. then the daytime view could be good. Then would he know the optics are good? Plus, it would also give him...
The Orion XT10 (with f4.7 focal ratio I believe) should serve up almost the same wide fields as your Orion 4.5 (with f4 focal ratio I believe). The XT10 will...
... Hi Andy, I doubt your neighbors will notice. You need to be fairly close to the beam source for it to really stand out against the sky. °Florian...
Thats cool. I have wished to bring my scope to one of my troops outings. Especially our summer camp(Ransburg Scout Reservation).. Cant wait to see the...
I assume it's distracting with light beams shooting all over the sky and may play havoc with astrophotography. I can just imagine a plane flying by feeling...
... just ... the beam source for it to really stand out against the sky. ... As I said I love my laser, but I do use it at home mostly. At a public star party...
Hello Andy, I purchased an 'Orion Super-Green Laser pointer' for a 2/28 CLOUDED OUT 'highschool demo night' !! Too costly to 'run that device in the duty...
... the European Astrofest here in London. My spine is fused due to an arthritic condition which makes it impossible for me to crane my neck down to a...
Hello all (thanks for your patience with my incorrect question, Jack K., Normand/Montreal), I've a 6" F/5 achro, SkyWatcher...love the views. I also have an...
Hi again Charlie, Now you make more sense! Geoff should be able to help you with that. If I remember correctly, he at some time had a 5" f8 achromat that he ...
... almost the same wide ... Actually the specs say it is F/3.9 ... Definitely keeping the 4.5 but upgrade the mount a little way down the road. Perhaps add...
Valery recently posted on the Chinese Refractors group that he still had a few Chromacorrs left but he was only interested in selling them with the recommended...
Charlie, The Chromacor was design for an F/8 telescope. This question had been asked in the Aries Yahoogroup and it will not work well at F/5. It can be made...
... That's correct, Rich. I've used a Chromacorr with a Celestron C-150HD for several years. Not only is the distance between eyepiece and Chromacorr critical...
Sounds like an interesting problem! Is this for a school assignment, perhaps? I hope you don't expect others to do all your work for you! Here's a formula...
... Heck, you don't even need basic trigonometry. You know the radius in kilometers of the circle formed by Jupiter with Earth at the center. Given the value...
Ooops! In any case I mis-stated the formula, it should be instead: s = (57.2958 / L) / a where s is the image size in millimeters a is Jupiter's angular size...
Good grief...one last time, I need more coffee and a remedial math course: s = a / (57.3/L) where s is the image size in millimeters a is Jupiter's angular...
Once you calculate size of Jupiter in angular degrees as seen from earth, you can use this: Image scale in mm per arc-second is F/206.265 if F is in meters. ...
Hi, It seems the Chromacorr is not the solution. I don't know how a 6" f5 achromat performs as a rich-field scope, but for me I think a 6" f5 or f4 reflector...
Thanks for this info, Normand and Rich. I'm quite satisfied with visual performance DSO's of the 6" F/5 SkyWatcher (it's 'first light' in Auriga with M36,...
Just curious why you desire this information. Remember that some of the best eyepiece views of Jupiter will include the moons circling 2 or more planet...
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