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Old 23-10-2006, 02:57 PM
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Satchmo
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Join Date: Dec 2005
Location: Sydney
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Quote:
Originally Posted by davewaldo
Hi All.

I'm keen to find out what you guys think would be a better EP than the Andrews 30mm UWA 80 degree EP. I have a F5 dob and I don't really like the level of aberations in the Andrews EP.

.
Hi Dave

You'll have to spend upwards of $1000 for a 31mm Nagler to improve the edge performance in an F5 . At 40mm field diameter the coma and astigmatism is getting severe. But then the field of view is great, I recommend putting a cardboard mask with 7.5" hole over the front , not as much light but the Andrews 30mm will be much sharper at the edge and you'll gain all that extra sharp field at effectively F7.

Mark
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