Daz Type-R Posted January 11, 2012 Report Share Posted January 11, 2012 Hi all. Is 300x zoom in this country pushing it (on average - I know on the very rare occasion we do get nice clear skies)? Cheers, Daz. Quote Link to comment Share on other sites More sharing options...
+Doc Posted January 11, 2012 Report Share Posted January 11, 2012 x50 mag per inch of aperture is the maximum you can use, but that depends on so many factors such as good seeing, dew, collimation, etc. So in theory your 8" scope should be capable of x400 but you might be able to use that once a year on that exceptional night. Quote Link to comment Share on other sites More sharing options...
Daz Type-R Posted January 11, 2012 Author Report Share Posted January 11, 2012 Cheers Mick, I knew the top range of my scope was 400x but did not mention that cause I thought I would never be able to use that in this country. So assuming dew and colimation is not an issue, the only thing stopping me using 300x zoom would be the seeing conditions, would I get much use at 300x then do you think? Quote Link to comment Share on other sites More sharing options...
Guest Kheldar Posted January 11, 2012 Report Share Posted January 11, 2012 Hardly ever, and pretty much only on the moon (the blue moon in this case!) Quote Link to comment Share on other sites More sharing options...
Daz Type-R Posted January 11, 2012 Author Report Share Posted January 11, 2012 Ok cheers guys, thanks. Quote Link to comment Share on other sites More sharing options...
+Doc Posted January 11, 2012 Report Share Posted January 11, 2012 I used to use x457 with my 16" dob on the moon quite a lot but then thats just over half of it's maximum magnification. Use it on the moon, splitting binary stars and and hunting out those very elusive globular clusters. Quote Link to comment Share on other sites More sharing options...
Guest Dex55 Posted January 11, 2012 Report Share Posted January 11, 2012 The max I have used out on Crete is x254. That is from my villa with minimal LP, talking about a small street light a couple of hundred yards away. The biggest problem I have is with ground heat thermals. Quote Link to comment Share on other sites More sharing options...
Daz Type-R Posted January 11, 2012 Author Report Share Posted January 11, 2012 I used to use x457 with my 16" dob on the moon quite a lot but then thats just over half of it's maximum magnification. Use it on the moon, splitting binary stars and and hunting out those very elusive globular clusters. It's those elusibe globular clusters and the moon that I had in mind. The biggest problem I have is with ground heat thermals. Not a problem in "sunny" Nottingham! Quote Link to comment Share on other sites More sharing options...
BAZ Posted January 11, 2012 Report Share Posted January 11, 2012 Whack up the magnification on M13 in Hercules, when you can get it, it's stunning, just like a firework going off. I did that at 5mm on mine which is 300x, pretty much at it's limit with bright objects. Quote Link to comment Share on other sites More sharing options...
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