Can you refocus for blue or does this cause other problems? Refocusing should greatly reduce the size of the violet ring. Scott Walker ... From: ancient.sull ...
I'll try. The way I took those images was to focus (FocusMax) at regular intervals with the L filter, then image in R, G and B. I didn't refocus with each...
That is a very good image of the Eskimo, and yes, the blue around the stars is chromatic aberration. Rolando ... image) ... not ... country. ... Eskimo ... the...
... Your doublet is actually very sensitive to decentering, and really cannot rattle around inside the cell. Even .001 decentering is quite ruinous to the...
In a message dated 3/1/2008 4:55:10 P.M. Central Standard Time, ... Your doublet is actually very sensitive to decentering, and really cannot rattle around...
Well that's good news in a way. I had a rattle, sent the scope off to TNR and it got un-rattled. It was a recent acquisition at the time and I wanted someone...
See... http://tinyurl.com/2o26t8 or, if you want to see where you are being redirected and approve to continue... http://preview.tinyurl.com/2o26t8 Clear...
Intersting . Thanks for the post. ... From: Alan French To: Refractors@yahoogroups.com Sent: Sunday, March 02, 2008 8:01 AM Subject: [Refractors] China is...
... No, it's the triplet oil-spaced designs that are much more tolerant with regard to the cell design. Whether triplet or doublet the air-spaced elements can...
Hi, This is my first post to this forum. I have been doing a lot of research on choosing a "grab n go" refractor for those nights when I don't have the time...
Jim; I have the 90T and like it a lot. Mine is an early example w/o the binoviewer compatible removable tube section. I also have the M1 mount on the older SV...
Rich, Thanks for your help. I want to be sure that it is not undermounted; it has to take the weight of a pair of Denk II binoviewers too. I might wait for...
Jim There is a used 90T for sale in the Dallas area at a considerable savings if you are interested. Contact me off line if you want. Wes ... research on...
Has anybody spent any time behind the eyepiece of one of these? Just wondering if they're worth it. I love rich field viewing, and a quality refractor of...
I have not used the scope, but I would expect a lot of chromatic aberation. In general a Petzval design only provides about a 25% reduction in chromatic...
From measurement sent to me by one purchaser of this scope, it appears to be a 6" F8 front lens with a smaller compressor lens permanently mounted down the...
Jim; So far as I know there is no version of the TV NP101 that will work with a binoviewer without the addition of an optical corrector assembly to move the...
Hey that's pretty good Drew. Noel Carboni has Photoshop actions and one of those is reduce violet halos around stars. It probably would help. I think basically...
Thank you Rich. it looks like it isgoing to be the SV90T on an M3 mount. Jim Walsh Rich Wood <astronut1001@...> wrote: Jim; So far as I know there is no...
Rich, Will do. Right now Vic said to expect about four months, as my order will be from the next batch of lenses. Jim ... mount. ... Congratulations, Jim. Let...
This is probably not want the guru's want to hear... but here goes... I've had several refracrors - some large and some small. And I do NOT have unlimited...
Warp, Sounds like you got a scope with a great objective lens! I agree with you that due to variations from scope to scope in the manufacturing process, some...
Hi , Has anyone tried this eyepiece yet (Baader Hyperion-Aspheric 72° Modular Eyepiece, 31mm ) ? Looks like it could be a winner . Thanks for any information...
I agree whole heartedly with your accessment of the mass produced scopes out there. I have had similar experiences with refractors and when one finds that...
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.
