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Latest Posts
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They typically have lots of chromatic aberration so the focus is quite soft. I use a UV-IR filter to help improve the image. PHD will normally guide well even though the stars look bad. -
I got in my guide scope and camera today, and started messing with it tonight....until the clouds rolled in For a scope, I got Orion 60mm Guide Scope with Helical Focuser, and for the camera, I got the ZWO ASI290mm. If it matters, its sitting on a Zenithstar 73. I entered the camera info in PHD2, but when I went to cycle through pictures for focusing every second or so, the image quality was horrible. Yes, it was a full moon, light clouds and bortle 5 so hardly good conditions at all. One of the issues I saw was when focusing it, I had to focus all the way out, and it was still blurry. I then loosened the thumb screws on the camera and took it out f the tube as far as it would go without falling out. It got better but feel it could still go more. Maybe the two arent compatible? Image below of what I got, and some settings. On top of it all, I could never get PHD2 to pick a star and start tracking. Bob -
Cool. I shall see if I can actually pull it off... Something like this: -
By Tiny Clanger · Posted
Okay, so how about this : some decent 10x50 binoculars ( a good compromise between light gathering and weight) with a monopod and suitable bracket and head to steady 'em ( see binocular sky's website for excellent info https://binocularsky.com/binoc_mount.php# ) , it's not easy to hold binoculars really steady for long without some support. That takes care of wide field , DSOs, clusters etc. And to complement the binoculars , showing objects at magnifications hand held binos can't manage, a 102 mak is small, compact, packable, and can be carried on a fairly modest alt az mount , so would be an eminently portable device for narrow field, high magnification views of planets and the Moon. Heather -
it’ll be more secure too- less likely to drop the mirror onto the primary. If you make it from aluminium then it’ll conduct the heat from your heated stalk and spread it more evenly across the back of the mirror i’d have thought.
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boulderbelly » Cornelius Varley
Hi There!... why was the topic on First light optics closed?· 2 replies
Thanks
David
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Having read Ken Harisson's excellent book Astronomical 'Spectroscopy for Amateurs' at least twice and innumerable visits to Robin's 'Three Hills Observatory' internet site, I have decided to haul myself up on the shoulders of giants and try to make yet another spectrograph this time involving a homemade adjustable slit! After a lot of deliberation I have come up with a modular design based on the 'Watkis Spectrograph'. I am currentlyputting together a heap of parts mostly gleaned from old bits of redundant/broken kit or stuff purchased from the NET in days gone past when I thought 'That's too good an offer to miss' (followed by a long languish in a box in the shed). Each module appears to pass the Transpec V2 spreadsheet test - so fingers crossed. At least I will have a project to keep me going through the winter.· 0 replies
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