For many refracors fans it is not a big secret, that color correction in APOs can be different. I mean, that with the same glass combo the designer can...
Why is option 1 preferable for narrow band? Because SA is smaller at individual wavelengths? Even at more extreme wavelengths (350-10000nm)? Can you show some...
... At the best visual focus (at 555nm) H-b, O-III and H-a will be at the best focus too and their Strehl will be highest possible in the case of nulling SA...
I would go for visual. Guido ... At the best visual focus (at 555nm) H-b, O-III and H-a will be at the best focus too and their Strehl will be highest possible...
Refractor fanatics divide into two groups, those that do visual imaging and those that do not. I think that the general market trend has been to maximizing ...
... Interesting take Greg.... do you think, as the sensors become higher and higher rez, that we might soon see a specialized camera with high resolution...
I think we're already moving towards fast-views-on-a-screen for crowds etc. I don't do it but the capability isn't hard. I think that when/if there is an...
Does anyone know where these lenses are made and who sells them? On the Astro-foren website they have tested some and their performance is quite remarkable. ...
Hello Tom, look at www.astroselbstbau.de/HCQ.htm ( sorry, it is in German ) On this website, you can find the e-mail-address of Dr. Schröder, who makes the...
They make masterpieces of optics, because they are skilled at it. It's like asking what skilled stone masons do, or skilled fly fisherman. There will always be...
... These results should be taken with a good doze of skepticism. Note, that the document insists, that low order SA is 0.127 magnitude (in waves?). This...
Hi Valery, Optimised for photographic. I also wonder how noticeable the difference would be between an APO optimised for visual versus photography. I imagine...
... With high grade glasses in triplet form one can have both. With a doublet apo, one needs to choose which way to go, but you can always add a mild form of...
I think the word posted here some zillion messages ago was that the TEC140 makes a few concessions to photography and that somewhere on some night while...
... I think it is well established that 1000x is empty magnification for such a aperture and I would debate there is any meaningful visual difference, and no...
... Don, we have a saying here that there are two subjects with the most common exaggerations: 1. The gasoline consumption of your car - extraordinary low...
I think, Don, that it is helpful to recognize irony. Any reasonable reading of the post is that there would be no discernible problems with the 140, although,...
Andreas: Have you ever been tempted to go insane with the magnification on spliting doubles, for example. I'm told that double barlowing and other extremes...
... Greg, I'm afraid having never been concentrating on doubles. My main fields are: 1. the moon, 2. the sun (herschel wedge), 3. Jupiter an Saturn and 4. open...
Yes Don I would agree. Some of the best views I have had of the planets were from a Celestron Nexstar 11. Aperture still rules but an APO needs far less ...
... less ... I think your on track. Mr Yoshida of Japan is a widely known planetary observer who has used a myriad of telescopes. He ranks the scopes he has...
The most impressive thing to me on that list is that the CN poster correctly used "myriad" as an adjective, not a noun. Generally speaking the larger apertures...
... thought ... it ... much. ... Agree, also the Japanese amateurs are not known to own large telescopes because of storage and transport issues. A large dob ...
If it were consumer reports the C11 and Orion 25 cm (10 inch Newt I guess) would be tagged "Best Buy". HOWEVER, if you're going to use impressionistic...
... This means: 1. Mr Yoshida never looked through really excellent telescope larger, than 6". 2. That Tak Mewlon 300 is just as bad, as typical SCT or even ...
... the ... http://www.cloudynights.com/ubbthreads/showthreaded.php/Number/2176180 ... larger ... I agree, Valery. I have compared my own 10" F14.6 MCT to one...
This poll has been set up on the Chinese Refractors group. If people here are interested I will set it up here too. Rich Wood ... <astronut1001@...> wrote: I...
... Yes, Roland, not one of todays refractor up to 10" can beat or even be equal with these Maks. You sure know, but forgot to mention, one more reason for...
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