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Field flattener for AT72ED - Apertura or AT

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#1 adamsdp

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Posted 12 December 2019 - 10:06 AM

I am looking to buy a field flattener as a gift for someone who has an AT72ED and wondering if the Apertura adjustable flattener

https://www.highpoin...table-m48-ffadj

or the Astro-Tech 2" flattener 

https://www.astronom...refractors.html

would be a better choice?  It will be used initially with a dlsr camera.  The Apertura is adjustable so that seems to be an advantage.  I spoke with someone who said the Apertura scope is the same optics as the Astro-Tech so that it would be compatible.  Thanks!

 



#2 petert913

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Posted 12 December 2019 - 12:37 PM

The adjustability of the Apertura is just to insure proper backfocus distance.  The AT unit is already matched to their scope, making adjustability unnecessary.

I always prefer to get an accessory for my scopes from the original manufacturer when possible. 



#3 Peregrinatum

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Posted 12 December 2019 - 12:45 PM

That refractor is an F6, so any flattener that is designed for the same FR should work.



#4 Astronomics

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Posted 12 December 2019 - 01:23 PM

https://www.astronom...ical-tubes.html




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