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recommendation for field flattener for AT130EDT

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#1 NikonMike

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Posted 23 March 2020 - 12:45 AM

Wanted to get some recommendations on which field flattener would work best for the AstroTech 130 EDT

 

Thanks in Advance

 

 



#2 LPA

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Posted 23 March 2020 - 07:29 AM

See my post:

https://www.cloudyni...-do-full-frame/

The AT FF/FR, which isn't available now, works fine for smaller cameras like the ASI1600. For an APS-C sensor like the ASI071, the AT FF/FR shows some elongation around the edges of the FOV. For that size sensor and larger, like the new ASI2600 and ASI6200, I would recommend the Riccardi FF/FR as shown in my post.

 

Larry



#3 fmeschia

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Posted 23 March 2020 - 10:32 AM

It’s worth mentioning that the Riccardi FF/FR won’t work with the AT130EDT unless you replace the stock focuser like Larry did. The stock focuser takes up too much optical path to allow the Riccardi to reach focus.



#4 LPA

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Posted 16 April 2020 - 09:49 AM

Here is a downsized, uncropped image I took last night of the Rosette Nebula in Ha from my backyard, well within the light dome of Dallas, using the AT130EDT, Riccardi FF/FR, and ASI071 camera. The image was generated from 42x120 sec. subs with basic PP to show how the Riccardi flattens the field across the entire FOV of the APS-C sized sensor in the ASI071. The back focus for my setup is 73 mm, very close to the recommended 73.5 mm for a 130 f/7 refractor. The FeatherTouch is a definite upgrade from the stock focuser. The greater backfocus of the Riccardi gives plenty of space for a filter wheel. Currently I just have a luminance and Ha filter to use with the ASI071, but I plan to add an LPR filter or one of the tri/quad band filters to give me greater flexibility with this setup when I can't image from a dark sky site.

 

RosetteNebula_Ha_HTcsmall.jpg

 

Larry


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