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M101 Pinwheel Galaxy (using SV66ED)

Technical card

Resolution: 4409x2939

Dates: June 6, 2016

Frames: One Shot Color: 10x480" ISO400 bin 1x1

Integration: 1.3 hours

Darks: ~32

Avg. Moon age: 0.99 days

Avg. Moon phase: 1.10%

Astrometry.net job: 1499011

RA center: 210.802 degrees

DEC center: 54.350 degrees

Pixel scale: 2.757 arcsec/pixel

Orientation: -86.790 degrees

Field radius: 2.029 degrees

Locations: SDAA Tierra Del Sol, Boulevard, California, United States

Description

My last few posts have ended up being reviews of small aperture scopes/lenses, so here is one for the Stellarvue SV66ED. This is a beautiful telescope that I don't find very useful. It is a two element ED that is good, but not as a good as a three element APO. While only 400mm f/6, it is not that small or light. The biggest problem is it has a Crayford focuser. I would say avoid Crayford focusers for astro-photography. They are hard to lock down, can't support a lot of weight, and suffer from differential flexture. With a 0.8x reducer flattener and APS-C DSLR, this unit sags making the optical train tilted and off axis. Better to get a well made rack and pinon or helical focuser.

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Author

Gilbert Ikezaki
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M101 Pinwheel Galaxy (using SV66ED), Gilbert Ikezaki