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Old 04-07-2015, 08:42 PM
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PRejto (Peter)
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Join Date: Jan 2011
Location: Sydney, Australia
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Question About Flatteners

Let's say I have a flattener that requires BF of 116mm. I'm trying to decide if my TEC180 will have enough focus in travel to accommodate the flattener. How does a flattener change the focal point compared to a scope without a flattener? Do they push the focus out a bit? A Precise Parts fitting on the focuser drawtube adds about 9mm. 116 + 9 = 125mm. Is it safe to assume that if I have over 5" of in travel on the focuser this will work?

Thanks!

Peter

Edit: The flattener I'm considering is for a TOA-130. I wouldn't expect it to give a full frame corrected field on a TEC180, but might it give enough correction to cover a KAF8300 chip? The TOA-130 is for a 2.7" focuser. Should I also worry about vignetting? Ideally I'd use the TOA-67 4" flattener. But with a BF of 106mm it is just a tad to short to fit my current gear. To use it I'd need to get a different camera, or a new housing for the camera I want to use. (Moravian G2-8300. I'd need the model without the inbuilt filter wheel)

Last edited by PRejto; 05-07-2015 at 07:25 AM.
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