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Samir Kharusi | all galleries >> Galleries >> Focal Lengths and Deep Sky Astrophotography > C14 Prime Focus 4125mm on APS M13
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28 May 2005 Samir Kharusi

C14 Prime Focus 4125mm on APS M13

Azaiba, Oman

Globular clusters really are more suited to large mirror telescopes, in this case a C14. At 4000+mm focal length we get major headaches with tracking, camera shake, mirror slap, shutter shudder, etc. For long exposures autoguiding becomes a must, but luckily star clusters can be imaged with very short sub-exposures, as short as 10 seconds each for the above.

Hutech Canon 20D without UV/IR Blocker,C14 at prime focus
29x10sec @ ISO 1600 full exif

other sizes: small medium large original auto
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Guest 19-Nov-2008 00:02
What a great shot!