Comparison C11 with Sharpstar 2032 (Riedl Rudolf)

Celestial hemisphere: Northern · Constellation: Gemini (Gem)

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Comparison C11 with Sharpstar 2032

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Comparison C11 with Sharpstar 2032

Based on the discussion of Niall MacNeill about the resolution difference between Refractors and SC I made a comparison between my C11 running at F7,1 (Fl 2000mm) and my Sharpstar Newton 8" F 3,2 (Fl 640mm). Both scopes have a bigger optical diameter - 280mm vs 200 mm. Resolution of both scopes is better than the seeing conditions.

I made a picture running both scopes side by side. Filters were same type but not same manufacturer. The Sharpstar is much faster therefore I used 800 ASA and at the C11 1600 ASA to compensate a little the F-difference (1 Stop equal to F3,2 to f 4,5). Real difference is F3,2 to F7,1.

The picture is after image integration, background neutralisation and color correction. No further processing.

Left side C11, 5min each, 1600 ASA, total image 335min, D750a with pixel size 5,95 my

Pixelscale for C11 at f 2000mm and D750 = 0,61". Picture is a 200% view!

Right side Sharpstar, 5min each, 800 ASA, total image 225min, D5100a pixel size 4,8 my.

Pixelscale for Sharpstar at f 640mm and D5100 = 1,56". Picture is a 500% view to come to the same size.

The better resolution is the outcome of the pure bigger focal length. Both scopes do have a big central obstruction. The Nikon D5100 has smaller pixels, therefore a bit better resolution.

Background noise is from the different sensors of the cameras.

What is as well interesting with the Sharpstar is that the outer parts of the nebula are a bit better visible, here the faster scopes helps. Otherwise the longer FL has a much better resolution.

Waiting for your feedback!

Nikon Imagers

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Status	Advanced success
Started	...
Astrometry.net job	4184059
PixInsight job	K9A4RGXOD2VI9U8PW1N0EZTNIGRY1AYQ
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	06h21m31s.202
RA (top/left)	06h21m48s.851
RA (top/right)	06h21m10s.490
RA (bottom/right)	06h21m13s.488
RA (bottom/left)	06h21m52s.700

Dec (center)	+23°34′54″.81
Dec (top/left)	+23°37′50″.88
Dec (top/right)	+23°36′27″.84
Dec (bottom/right)	+23°31′57″.78
Dec (bottom/left)	+23°33′25″.54

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Comparison C11 with Sharpstar 2032

Comparison C11 with Sharpstar 2032

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Comparison C11 with Sharpstar 2032

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