New photos/text at <http://tech.groups.yahoo.com/group/sct-user/files/LX200-OTA-disassembly/> Original style LX-200 Classic dec. sleeve bearing (with thust ...
110392
Huey Stevens
tasquasar
Jul 1, 2009 5:35 pm
Hello All I own a Bausch and Lomb 8" SCT - which Uncle Rod claims is a vamped up Dynamax 8". It's pretty obvious he doesn't like this scope. So I'm in the...
110393
Richard Richins
badsocref
Jul 1, 2009 6:09 pm
I own a C11 and love it. As with most things, some people need to have the newest technology, and the C11 is becoming a bit dated. Since it's an alt/az mount,...
110394
moshen
paranoidroid1
Jul 1, 2009 8:47 pm
Ok, I'll try. Won't be easy without the compass though :)...
110395
Rod Mollise
rmollise
Jul 1, 2009 9:02 pm
No claim to it. It's based on the Criterion design. Criterion wound up in the hands of Bauch and Lomb in the mid 80s. As for the scope, I'd-a liked it if I...
110396
Jaroslaw Pillardy
jarekpp
Jul 1, 2009 9:41 pm
I used to use my C14 mostly with Hyperstar, but recently I tried to go back to some higher resolution imaging at around f7. Previously I used Canon 40D, and 4...
110397
Robert Piekiel
piekielrl
Jul 1, 2009 10:45 pm
Hi Hugh, I've had one for several years and it's great. Any Alt-Az scope is only good for short exposures because of field rotation. You need to get a...
110398
gnowellsct
Jul 1, 2009 10:50 pm
On an SCT what would cause an asymmetry, wherein on one side of focus the secondary shadow is perfectly centered, but off-center on the other side of focus...
110399
Rod Mollise
rmollise
Jul 1, 2009 11:21 pm
And the only commercial field de rotator I now of was designed for the Meade LX200 and will not work with the NS. Peace, Rod Mollise Rod's new book: _Choosing...
110400
Robert Piekiel
piekielrl
Jul 1, 2009 11:42 pm
Hi Greg, Interesting you should ask this! It's one of the topics in a small new book I'm doing about SCT collimation. To answer the question, it's either a...
110401
Bob G
bj_rcg
Jul 1, 2009 11:45 pm
There are a heck of a lot of these scopes out there ...so finding one for sale is usually not a problem except in my case when I looked and looked then just...
110402
Rod Mollise
rmollise
Jul 1, 2009 11:46 pm
Let me add that there are a few good B&Ls...the 8001 scopes...but those are it. Peace, Rod Mollise Rod's new book: _Choosing and Using a New CAT_ Available...
110403
gnowellsct
Jul 2, 2009 12:18 am
Looks like its time for me to buy a copy. When you say misaligned primary, do you mean not centered correctly round the baffle, or do you mean that there is...
110404
Robert Piekiel
piekielrl
Jul 2, 2009 12:25 am
I mean the tilt of the primary is off. You can actually get away with an off-centered primary, because it is SPHERICAL, as long as it's tilted correctly. A...
110405
Christopher Go
stone_1990
Jul 2, 2009 1:06 am
Seeing was very good this morning. But transparency was very poor! My histogram reading was only 40% at 1/15s exposure time and 100% gain! But because of...
110406
Noel Carboni
noelcarboni
Jul 2, 2009 2:14 am
... "Mr. President, that's not *entirely* accurate." I've done imaging quite successfully with my alt-az setup up to 30 seconds to a minute. Depending on...
110407
Richard Richins
badsocref
Jul 2, 2009 5:51 am
Yes, I totally agree. There are patches of sky that display little or no rotation for portions of the night. You probably need some astronomy software to...
110408
Chris Rowland
scope_sapiens
Jul 2, 2009 12:44 pm
... Looking East And West Chris...
110409
Mark Crossley
crossley_mark
Jul 2, 2009 2:02 pm
There is a graph on Doc Gs website... http://www.mapug-astronomy.net/ragreiner/rotators.html#Graph Mark 2009/7/2 Chris Rowland <chris_group_mail@...>...
110410
Bob
b8231103
Jul 2, 2009 2:31 pm
Excellent work Chris...keep them coming. Two questions: When do you sleep? Do you have a tutorial on your methods of planetary imaging? Thanks, Bob [Non-text...
110411
gnowellsct
Jul 2, 2009 4:29 pm
field rotation is a "definite issue" limiting exposures to 30 seconds or so on mounts that are aligned on zenith wehn you're at N American latitutdes. My...
110412
gnowellsct
Jul 2, 2009 4:47 pm
Bob: Well this problem is episodic, near as I can tell. What do I mean by episodic? I mean that I have the problem when I collimate, but when I run around...
110413
tom_krajci
Jul 2, 2009 5:47 pm
... Part two - now that I've disconnected OTA/stub axles/forks...the thrust bearing on one fork arm...did not have a steel thrust bearing washer between the...
110414
tom_krajci
Jul 2, 2009 5:52 pm
... Sounds like mirror flop - that inherent design problem you find in most mass-produced, moving-main-mirror scopes. So far I've seen two causes of main...
110415
marc patry
marc31patry
Jul 2, 2009 6:06 pm
I did a small animation from Toulouse (France) in the 1st of July, from 4h30 AM to 5h30 AM (european time = TU+2). Each picture is the result of a 600 frames...
110416
Robert Piekiel
piekielrl
Jul 2, 2009 6:07 pm
Hi Greg, you are correct. I would tighten the main mirror lockring a bit if you can. make sure your secondary screws are snugged finger tight, and that the...
110417
Chris Peterson
cloudbait
Jul 2, 2009 6:23 pm
Greg- Field rotation with equatorial mounts is a bit tricky, because the amount of rotation you get depends on where you are pointing your scope. To analyze ...
110418
John Mahony
jmmahony
Jul 2, 2009 6:43 pm
Optec makes one: http://www.optecinc.com/astronomy/pyxis.htm I think you can use that with any scope if you have the right software controlling it. But I also...
110419
Christopher Go
stone_1990
Jul 2, 2009 7:09 pm
Hi Bob, I wake up every 2 or 3am and grab a few image then go back to sleep. It could be tiring at times but I get use to it. I don't really have a tutorial...
110420
Richard Richins
badsocref
Jul 2, 2009 8:19 pm
I routinely do just a polar alignment (not a drift alignment), and can go easily 4-5 minutes without any detectable rotation. Over time, the subs will show...
