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
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