M57 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 | : | 8 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 and clouds kept rolling across the imaging area |
| Place of photographing | : | PTC coach carpark in Sai Kung, Hong Kong |
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Remark |
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A test shot to see the image scale provided by this VMC + 0.60x reducer |
Comments after test :
This object was captured at the same night and sky conditions as the M27's. So, the scope was out of collimation.
Ignoring the elongation of the bottom stars due to poor collimation and by considering the exposure of just 160 sec in total, this M57 came out not too bad.
So, this Vixen big VMC should be a good weapon for close-up deep sky imaging if collimated well.
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© All images are copyright William L.T. Ng.