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Astro - Comet Holmes - USM.jpg (1/1)
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Astro - Comet Holmes - USM.jpg (1/1)
Looks like a jellyfish, good detail.
Stefan "Kaptain Klevtsov" schrieb im Newsbeitrag ... |
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Astro - Comet Holmes - USM.jpg (1/1)
Best shot of the multi tails I have seen. They are only hinted at in my shot. I toyed with unsharp masking but didn't push it like you did. Looks like I should have! I'll find the time to go back and see what that does for me. Though the bow shock is well out of my frame. I do need to get something with a shorter focal length! Rick -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
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Astro - Comet Holmes - USM.jpg (1/1)
"Kaptain Klevtsov" wrote .... Now that really shows the inner coma detail!! George N |
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Astro - Comet Holmes - USM.jpg (1/1)
"Rick Johnson" wrote
They are only hinted at in my shot. I toyed with unsharp masking but didn't push it like you did. Looks like I should have! I'll find the time to go back and see what that does for me. Though the bow shock is well out of my frame. I do need to get something with a shorter focal length! Rick, I bet that the same detail is in your data just waiting to be teased out! Do you have a focal reducer? Or you could always go the mosaic route. I've been toying with the idea of buying or building an 8-inch F/4 Newt with coma reducer as a 'wide-field' imager and Milky Way scanner for visual use. Vixen and Parks both sell 8" F/4's and Royce sells a cone-shaped primary. George N |
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Astro - Comet Holmes - USM.jpg (1/1)
George Normandin wrote: "Rick Johnson" wrote They are only hinted at in my shot. I toyed with unsharp masking but didn't push it like you did. Looks like I should have! I'll find the time to go back and see what that does for me. Though the bow shock is well out of my frame. I do need to get something with a shorter focal length! Rick, I bet that the same detail is in your data just waiting to be teased out! Do you have a focal reducer? Or you could always go the mosaic route. I've been toying with the idea of buying or building an 8-inch F/4 Newt with coma reducer as a 'wide-field' imager and Milky Way scanner for visual use. Vixen and Parks both sell 8" F/4's and Royce sells a cone-shaped primary. George N Reducer doesn't help. I'm already using the full field of the LX200R. It is 1.75" across at the field stop which is about 8" in front of the focal point so I'm getting a bit of vignetting on the corners now though it flat fields out. My off axis guider comes in at the short side and the on camera guiding chip is on the other short side. So I can't really use a compressor. I bought one and quickly found out it was useless. I may use it visually to save expensive eyepieces for low power. A mosaic of a comet would be interesting as the overlapping stars wouldn't match due to motion of the comet between the views. I'd need 4 for this guy. The overlap would look really odd I'm afraid. If I rebuild my 6" f/4 it would work. Right now the tube is old and weak where the spider sits allowing flex that causes it to lose collimation just by slewing 40 degrees. A new fiber glass tube and better spider should do the trick if the coma reducer for the STL series does its job. I've not seen or heard much about it. The other problem is I love that scope visually and would hate to lose it. Held in your lap while on my deck in a reclining swivel chair and you can quickly get lost in the universe with that scope. Eventually I'll figure something out. Any cheap FSQs out there? Nope, didn't think so. Rick -- Correct domain name is arvig and it is net not com. Prefix is correct. Third character is a zero rather than a capital "Oh". |
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Astro - Comet Holmes - USM.jpg (1/1)
Kaptyan, Im going to post a reply in image of yours. Ive seen
a number of images like this to date. What intriques me is the structural detail below the surface image. I have labeled voids and layers. I have my own ideas but I will leave the physics to others. Thanks. Jerry Kaptain Klevtsov wrote: [Image] |
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Astro - Comet Holmes - USM.jpg (1/1)
"Rick Johnson" wrote ....... If I rebuild my 6" f/4 it would work. Right now the tube is old and weak where the spider sits allowing flex that causes it to lose collimation just by slewing 40 degrees. A new fiber glass tube and better spider should do the trick if the coma reducer for the STL series does its job. I've not seen or heard much about it........ Rick, I have two friends who bought an old Cave 6-inch F/4 Newt tube and replaced the focuser with a Moonlight duel-speed unit. They use the Baader coma corrector and it works great. However they are using relatively small CCD chips compared to your STL-11k - an old Starlight Xpress MX-716 and another camera (forget which one). I like the idea of trying a short focus 6 or 8 inch Newt F/4. Allen Chen has a home-made 12.5 inch F/4.5 with a FT focuser in place of the secondary mirror. He uses a large chip and Baader corrector with great success. Unfortunately I don't think the design would scale down because the camera would take up too much of the field. George N |
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Astro - Comet Holmes - USM.jpg (1/1)
warner wrote:
Kaptyan, Im going to post a reply in image of yours. Ive seen a number of images like this to date. What intriques me is the structural detail below the surface image. I have labeled voids and layers. I have my own ideas but I will leave the physics to others. Thanks. Jerry The "voids" are merely artifacts of extreme image processing. Note the "voids" around the brighter background stars, as well. |
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Astro - Comet Holmes - USM.jpg (1/1)
Mike Nelson wrote: warner wrote: Kaptyan, Im going to post a reply in image of yours. Ive seen a number of images like this to date. What intriques me is the structural detail below the surface image. I have labeled voids and layers. I have my own ideas but I will leave the physics to others. Thanks. Jerry The "voids" are merely artifacts of extreme image processing. Note the "voids" around the brighter background stars, as well. Thanks for pointing this out. Jerry |
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