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ASTRO: M31 widefield
Have been playing with a setup, which should have the potential to give me
some nice 'widefield' images: STL11000 GM8 TMB115 Williams optics field flattener. Unfortunately (as is always the way), after getting the adapters made to fit it all together, it has been cloudy in the UK, till the beginning of this week, when a couple of 'clearish' nights developed. Fairly strong Moonlight, which didn't help, and then a number of problems getting stuff to work, led to the only useable image, being a set of one each, LRGB of M31. All 200 second exposures, which gave quite a good (but rather noisy) luminance, while the colours were rather underexposed. Decided to assemble the image anyway, though with the noise, downsampled by 25%, to give a rather smoother result. Though the colour sems rather lacking in red especially on the galaxy core, it otherwise gives me significant 'hope', showing the FOV involved. The flattener seems to work quite well, with CCD Inspector showing a slight bulge 'up' in the centre of the image, and a similar upturn at the extreme corners, but less than 20% 'worst case' defocus, which is good on a field this large. Anyway, worth a grin. :-) Best Wishes |
#2
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ASTRO: M31 widefield
"Roger Hamlett" wrote Have been playing with a setup, which should have the potential to give me some nice 'widefield' images: STL11000 GM8 TMB115 Williams optics field flattener. ........ ......and then a number of problems getting stuff to work..... Roger, It only takes one problem and it "doesn't work"........ I would suspect that you have more data hiding in the center of the galaxy and you could stretch this image to show it. However, it is a great image, despite your problems and the moonlight. Last night I had a chance to observe thru a Williams 110mm APO and the owner had some great prints showing M-31 which he had taken with a Canon DSLR (before removing the filter). It was pretty similar to your image. We also had the scope on the moon at around 250x and it provided very nice views. George Normandin |
#3
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ASTRO: M31 widefield
Roger,
that's a very impressive FOV indeed. You have some nice equipment for wide field shots there. Stefan "Roger Hamlett" schrieb im Newsbeitrag ... Have been playing with a setup, which should have the potential to give me some nice 'widefield' images: STL11000 GM8 TMB115 Williams optics field flattener. Unfortunately (as is always the way), after getting the adapters made to fit it all together, it has been cloudy in the UK, till the beginning of this week, when a couple of 'clearish' nights developed. Fairly strong Moonlight, which didn't help, and then a number of problems getting stuff to work, led to the only useable image, being a set of one each, LRGB of M31. All 200 second exposures, which gave quite a good (but rather noisy) luminance, while the colours were rather underexposed. Decided to assemble the image anyway, though with the noise, downsampled by 25%, to give a rather smoother result. Though the colour sems rather lacking in red especially on the galaxy core, it otherwise gives me significant 'hope', showing the FOV involved. The flattener seems to work quite well, with CCD Inspector showing a slight bulge 'up' in the centre of the image, and a similar upturn at the extreme corners, but less than 20% 'worst case' defocus, which is good on a field this large. Anyway, worth a grin. :-) Best Wishes |
#4
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ASTRO: M31 widefield
"George Normandin" wrote in message ... "Roger Hamlett" wrote Have been playing with a setup, which should have the potential to give me some nice 'widefield' images: STL11000 GM8 TMB115 Williams optics field flattener. ........ ......and then a number of problems getting stuff to work..... Roger, It only takes one problem and it "doesn't work"........ I would suspect that you have more data hiding in the center of the galaxy and you could stretch this image to show it. However, it is a great image, despite your problems and the moonlight. Last night I had a chance to observe thru a Williams 110mm APO and the owner had some great prints showing M-31 which he had taken with a Canon DSLR (before removing the filter). It was pretty similar to your image. We also had the scope on the moon at around 250x and it provided very nice views. George Normandin I agree. However the image is so noisy, that I was really only 'interested' as a test of the setup, and slightly pleased by the FOV. Had a chance late last night (cleared for a while), to take a 4 frames of M52. The combination looks a lot more hopeful, and the astonishing thing is that Pinpoint, reports over 28000 stars, even set on a very gentle set of search criteria. Starts to look very interesting. :-) Best Wishes |
#5
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ASTRO: M31 widefield
"Roger Hamlett" wrote
You got the bubble nebula too Roger! Great image!! George N |
#6
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ASTRO: M31 widefield
"George Normandin" wrote in message ... "Roger Hamlett" wrote You got the bubble nebula too Roger! Great image!! George N Yes. This one shows more promise I think. :-) Now all I have to do, is take it all apart, and send the adapters to be anodysed, at which moment, the skies will (of course) magically clear... Best Wishes |
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