I know this is a refractor board, but I am thinking that I could maximize the performance of a reflector by making it long focus along the lines of this large...
I image with both a 4-inch refractor and an 11-inch SCT. Perhaps that qualifies me as somewhat unbiased. You can see the setup at http://dpersyk.home.att.net ...
Years ago I started work on a 12.5 inch f/12 long focus reflector for Mars' opposition of 1988. Didn't get it finished in time. Finally had Barry at D&G...
NGC 4884 is at the center of a group of galaxies in Coma Berenices. I only got 14 minutes of exposure before clouds rolled in but I was surprised at the number...
Dennis: That's an impressive image for a 4" scope in only 14 minutes. I would enjoy seeing your results of 1 to 2 hour exposure. Marv ... Berenices....
Bryan wote in part: <SNIP> ... <SNIP> I agree that long focus reflectors and achro refractors benefit when built with a long focal length. They're easier to...
Mike, I agree with what you say, especially the part about it being hard to beat zero obstruction. I'll split the difference with you as far as what the...
Hi Marv, Thanks for looking. I too was surprised at how deep the 14 minute image was. I do want to revisit that group and image for an hour or two. Clear...
Image at http://home.att.net/~dpersyk/new.htm Barnard dark nebulae are dark patches of sky with dense dust clouds which obscure the stars behind the clouds....
Hello: I would like to know if there are some owners of the A-P 6" f/12 "Superplanetary" telescope and if they still use tham, specially the one that has the...
I just got word that Meade has sadly discontinued their 6" ED-152 and 7" ED-178, their two largest semi apo refractors. Too bad, those were nice middle ground...
... specially ... splendidly. ... Hi Eric. My friend has a Super Planetary that was professionally custom made into a folded OTA some 14 years ago by a...
Hi Steve, I have a FS-102 on a Tak EM-1S mount with FCL tripod. The EM-1S is an older mount, with the same capacity as the EM-10. It just has one drive ......
Squirrel rote in part: Hi Eric. My friend has a Super Planetary that was professionally custom made into a folded OTA some 14 years ago by a previous owner. ...
Hi Squirrel, I have spent the last couple of nights comparing my Tak FS-152 to an 8" Orion Dob and a 10" F6 Dob w/ Zambutto primary (I own all three). I have...
Mike: I do not know, but probably I got one of the really superb NASA glass 6" f/12 "Superplanetary" telescopes, mine does not show color in Venus, Rigel,...
Hi Eric I owned at one time a 6 inch F9 NASA glass AP refractor. I still remember that it performed great; it consistently beat out my friend's new orange tube...
Hi Rat. As the Squirrel said to the Rat...! as indicated in my post, I expect there to be some drop in performance due to the mirrors involved. How much this...
Squirrel: Thanks for your feedback, I think that the folded A-P will have almost the same performance of a straight tube configuration, just depending on how...
About 2 months ago, I purchased a compression ring eyepiece holder for my Guan Sheng Dob's 2" Focuser from Mercury Systems Support. I followed it up recently...
I was very fortunate to purchase a used D&G 5" f/10 a few months ago and have been very happy with the views. The optics in the D&G are outstanding and really...
I was very fortunate to purchase a used D&G 5" f/10 a few months ago and have been very happy with the views. The optics in the D&G are outstanding and really...
... really ... I have had a 10" f/9.5 Newt for about 20 years. My wife has had a 10" f/6 for almost as long, and there is not a big difference between the...
Hi, Can anyone provide some of the advantages for the use of flourite in apo's? Assuming two scopes of identical aperature, one a flourite with a slightly...
Images at http://home.att.net/~dpersyk/new.htm I imaged C/2003 H1 LINEAR last night with the 4-inch NP101 @ f/5.4 and MC716 CCD. The comet was low in the sky...
Not sure if this really answers your question, but in comparing the Vixen 102 F9 Flourite to say the TeleVue 102 F8.6 ED side-by-side you will notice much,...
Hello: Does anyone in the list know how much backfocus does the TV-101 refractor have? Does the TV-101 refractor have at least 2.5" backfocus? JAMES KEVIN TY ...
... James; I am not sure what your application is, but here are the numbers. With the focuser all the way in, the focuser has 2.4" of travel out. The focal...
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