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Latest Posts
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By Kitsunegari · Posted
And yea, People really did use a string as a focuser... The Era of Long Telescopes | SpringerLink -
I suggest that you check with QHY, their 294mono camera is cheaper than the ZWO version, and it includes dew heater etc as well. All accounts point to a big improvement compared to the 1600 sensor. N.F. -
By Kitsunegari · Posted
Strehl ratio changes with color. Usually telescopes are rated for one color of light, typically green. The hard truth here, is that a triplet / quadruplet telescope that was designed for visual use at 450nm -680nm maybe absolute garbage at 390nm. (very important to solar observation) Spectrally a little different for mirrors because they perform the most amazing at blue light, however spherochromatism is going to make or break your enjoyment with imaging and high magnification.... -
By Kitsunegari · Posted
Works great for night time too The first image is h-alpha, the second is calcium k-line. For the first image its a modified Lunt LS50C etalon that i put in a shroud for internal use. (normally is intended for external) That particular calcium filter is something that I developed and cannot be purchased (was my own development). Its called a Skybender. -
Also, what has this to do with strehl ratio ?
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Wohoo! I did my first night time observing in over a year, I think! Woke up early, couldn't get back to sleep. Orion Nebula, M81 & 82, three clusters in Auriga, the Double Cluster and the Orion Nebula in my 10 inch dob. Not bad as I had to fight patches of cloud and am out of practice finding stuff manually! Then to cap off a beautiful morning, I saw the lovely new sunspot on the limb after breakfast using a Herschel wedge.· 0 replies
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Clear sky tonight. Managed to observe one straggler Leonid but as usual my camera was pointing in the wrong direction. Managed to capture two long sequences of exposures. Canon 600d camera - on Star Adventurer driven mount - lens at f=18mm and ISO 1600 -exp 45 secs. & 60 secs. Widefield images of Auriga and the Pleiades. Just completing calibration frames then off to bed. Lovely night with Orion looking splendid.· 0 replies
Night night Stargazers.
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