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W.O. x0.8 Flattener II - Which Refractors?

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#1 Tom Wade

Tom Wade

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Posted 18 February 2018 - 12:05 AM

I have a William Optics X0.8 Flattener II made for a 66 APO.  My question is, can I use this with a Zenithstar 61mm?  Or is this specifically for use with a 66mm refractor?

 

Thanks.



#2 orlyandico

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Posted 18 February 2018 - 06:48 AM

Generally a flattener is made for a particular focal length. The ZS66 has a 388mm focal length, and the ZS61 has a 360mm focal length. Close enough, it should work.

 

I had one of these and used it on even a 900mm focal length telescope (an Orion 100ED) and it wasn't terrible.


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