M45 with Vixen ED81S apo refractor
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| Date | : | 07 Jan 07 |
| Optical system | : | Vixen ED81S apo refractor + unmodd Canon EOS 350D body + IDAS LPS filter |
| Effective F.L. & F ratio | : | 630 mm @ F7.7 |
| Mount | : | Vixen GP non-goto equatorial mount |
| Camera setting | : | Jpeg format @ iso1600 w/ NR on |
| Total exposure | : | 9 x 60s + 12 x 20s = 540 s |
| Guiding | : | Unguided |
| Stacking & processing | : | Stacking in Registax 3.0, Level & Curve stretching in Photoshop 7.0. |
| Sky & Air conditions | : | T = 5-6/10 @ temp ~ 8 oC, breezy to occasionally windy |
| Place of photographing | : | Tai Mo Shan in Tsuen Wan, Hong Kong |
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Remark |
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A test shot to see how LPS filter did the job in "curing" light pollution |
Comments after test :
Though not so obviously, the nebulosity did was captured. If w/o the LPS filter, that would be possible to get it.
LPS blocked light pollution quite significantly and a neutral background sky resulted, which didn't introduce too much work on neutralizing the color of background sky.
So as to see how much nebulosity of M45 could be captured within the max. unguided exposure of 60 sec at this focal length offered by GP mount, I decided to select ISO speed of 1600 in spite of very noisy image resulted as expected.
If your sky is also light pollution, a LPS filter may help you to block it by a certain amount.
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© All images are copyright William L.T. Ng.