M27 with Vixen VMC260L
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Date | : | 29 Aug 06 |
Optical system | : | Vixen VMC260L + 0.60x reducer + unmodd Canon EOS 350D body |
Effective F.L. & F ratio | : | 1800 mm @ F7 |
Mount | : | Vixen old version ATLUX non-goto equatorial mount |
Camera setting | : | Jpeg format @ iso800 w/ NR on |
Total exposure | : | 16 x 20s |
Guiding | : | Unguided |
Stacking & processing | : | Stacking in Registax 3.0, Level & Curve stretching in Photoshop 7.0. |
Sky & Air conditions | : | T = 5-6/10 @ temp ~ 27 oC, clouds kept rolling across the imaging area |
Place of photographing | : | PTC coach carpark in Sai Kung, Hong Kong |
Remark |
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A test shot to see the image scale provided by this VMC + 0.60x reducer |
Comments after test :
This was the first light from this scope in deep sky imaging. When it arrived, the collimation was out very seriously. Just using laser collimator to do a rough re-collimation. Before the commencement of new school year, I really wanted to see how it would perform in deep sky imaging. So, despite of not perfect collimation, I took it out to have a test.
M27 is one of my favourite object. But the sky didn't cooperate with my imaging at that night. Lots of cloud "flying" across the imaging area. I had to chase with the cloud gap to grab the limit time to shoot this object.
Stars at one side (bottom side) showed elongated. That indicated the scope was out of collimation by quite an amount. But, just looking at the M27 object, it stood out quite satisfactory considering a so short exposure of merely 320 sec in total.
So, this Vixen big VMC should be a good weapon for close-up deep sky imaging if collimation well.
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© All images are copyright William L.T. Ng.