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PROSTAR - ASTRO-TECH FIELD FLATTENER - AstroShop


ASTRO-TECH FIELD FLATTENER
A High Performance Economical 2 inch Field Flattener

Model: PS-ATFF2

Recent testing of the Astro-Tech 2 inch field flattener for telescopes F/6 to F/8 yields very satisfactory results. Customer Terry Robison provided these initial illustrations and comments while evaluating our first sample unit.

The tests were performed using an 8300 class 2 chip shot from the city in Melbourne.  As a result, there is quite a lot of noise and sky glow.  I have included a full sized jpeg of the RAW image with no calibrations or processing.

The scope used in the test was the Vixen ED81S refractor.  To couple the corrector to the telescope, heused the Baader Click Lock system that screws securely into the Vixen M60 mm focuser draw tube. 

The  Astro-Tech 2 inch field flattener then slides into the Baader click lock system with a nice positive fit.  The initial test had around 57-58 mm optical back focus distance to the APS sized CCD Chip (18.1 mm X 13.7 mm - 27 mm diagonal distance).   With only one test, I didn’t have the opportunity to test varying lengths to determine the optimal distance.
 

CCD_Inspector_3-D_Plot
Above: CCD Inspector 3-D Plot
CCD Inspector Curvature
 
Above: CCD Inspector Curvature
120-SecTest is the unprocessed RAW to JPEG image used
Above: 120 - second exposure test being the unprocessed RAW to JPEG image used

Above: Aberration Assessment Corners show the stars taken from the extreme corners, top and sides and centre of image.

Above: Quick RGB image of M014 using the ProStar-Astro-Tech 2 inch Field Flattener with Vixen ED81 refractor.
 

We will revise this review as more testing time / results becomes available


 

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Note: AstroShop reviews are only intended to provide prospective purchasers our own first hand impressions of performance and build as has been our long time policy.

 

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