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Many thanks for your comments James and Andrew. I’ll check the linearity and see how it goes!I
Cheers,
Mick
I reckon I can now answer my own question – it’s not worth risking using the corrector as the instructions (which I’ve just found again) state that for “low power visual use”, the sharpest possible images across the “majority” of the field is obtained by first focusing on the central stars and then turning the focus knob approx. 1/12 of a turn CCW. So in effect nothing would be 100% in focus across the field. This might be fine and not really noticeable for general low power viewing but I wouldn’t be happy making variable star estimates using it in this way.
Cheers,
Mick
3 Images taken with Orion 140 Maksutov f14.3, Baader Solar Film and Canon 1000D DSLR from Fulwood Preston.Excellent conditions with hardly a cloud in the sky (rare for Lancashire!) I missed the end of the transit as the Sun had dipped behind the trees.
2nd Contact – 11:15 UT, just after 2nd Contact 11:17 UT and one at 13:11 UT
These new lights seem to be appearing gradually in Preston – two have appeared in my road over the last couple of months. They seem well sheilded, but much brighter. As they are “white” in colour, what are the options for effectively filtering them out?
Mick
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Many thanks Gary…. wow, that’s a big distance range for novae with a similar absolute magnitude! That does surprise me as I thought they might behave in a similar fashion to Sne in that they could be used as “standard candles” . The reason I asked is that I have been considering the distribution of detected novae and, as we appear to lie between two major spiral arms in the Milky Way, I would have expected more novae to occurr in the outer arm than are currently being found. I was anticipating that, although novae occurring toward the galactic centre would be obviously more numerous, they would be much fainter than mag 7-8, but this is obviously not the case! Thanks for helping me get my head around this Gary!Mick
