Hi,
The sky is clear but seeing is not good (1-2/5)
I've capture some images.
Telescope : AP Starfire EDT 155mm f/9 stopped down to 50 mm
Filter: Solar Spectrum 1.5/0.3A with CERF prefilter
Camera: Imperx 4M15, 2kx2k pixel, 15x15 mm sensor.
pts
2011 Nov 28 Sun
2011 Nov 28 Sun
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- Oven temperature set at normal 57.0C
- 20111128154333671-570.jpg (387.88 KiB) 已瀏覽 2760 次
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- Oven temperature set at 55.6C
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- 20111128152102.jpg (378.63 KiB) 已瀏覽 2760 次
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- Exposure: 0.9 s
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More images
These are captured using the same equipment, except:
Full aperture of 155mm is used, with a 4X telecentric lens to give an effective focal ratio f/36.
pts
Full aperture of 155mm is used, with a 4X telecentric lens to give an effective focal ratio f/36.
pts
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- 20111128162305.jpg (560.38 KiB) 已瀏覽 2745 次
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- 20111128162128.jpg (678.62 KiB) 已瀏覽 2745 次
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- 201111281644.jpg (614.8 KiB) 已瀏覽 2745 次
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- 201111281637.jpg (184.02 KiB) 已瀏覽 2745 次
More image
Here are more images
pts
pts
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- 20111128162721.jpg (635.2 KiB) 已瀏覽 2731 次
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- 20111128162639.jpg (658.13 KiB) 已瀏覽 2731 次
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- 20111128162450.jpg (680.78 KiB) 已瀏覽 2731 次
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- 20111128162357.jpg (510.75 KiB) 已瀏覽 2731 次
Still more
Another set of images.
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- 20111128164444.jpg (663.38 KiB) 已瀏覽 2719 次
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- 20111128163634.jpg (195.68 KiB) 已瀏覽 2719 次
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- 20111128163412.jpg (167.9 KiB) 已瀏覽 2719 次
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- 20111128162800.jpg (678.82 KiB) 已瀏覽 2719 次
Thank you for your comments. However, there is no gamma adjustment in the Imperx 4M15. I suppose I can do post-processing for this, but i don't have time for that now.noodle 寫:....會唔會個solar spectrum 溫度未到? [疑惑]
0.3A 個對比應該會高d喎。
試試拍攝時調低個gamma睇下會唔會好d。
My problem here is not the contrast, but the optimum optical arrangement. I have to do some machining (for extension tubes) to get to the 220 mm backfocus (the separation of the rear lens of the 4X Telecentric lens to the CCD plane). I was just experimenting with the setup yesterday, to see if I can get proper focusing.
It as already 4 pm when I did this, and the Sun was very low, just a few degrees above a concrete wall. This make the seeing from bad to "extremely bad". The features in each frame of my 50-frame sequences are all jumpy.
I am also trying different oven temperatures to find the optimum working temperature, apart form the 57C given by the filter manufacturer.
One more thing to do is get a larger harddisk. I used up 6.5 GB on Nov. 27, and more than 13 GB yesterday. This was because I use BMP file format (8 bit, 4 MB each). Had I used tiff, the file size would have doubled.
Just wait for some good-seeing days, I suppose I can improve on these.
pts
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- 中子星
- 文章: 1090
- 註冊時間: 週一 11 8月, 2003 16:10
Focusing is sort of problematic, but mostly it was the bad seeing.HK.Raymond.Tse 寫:Was there any problem with the seeing or focusing, or both ?
The larger aperture resolution is still blurred out
Raymond
When pushed to f/36, each pixel seemed jumping around.
I need a day of better seeing to really get to the full potential of my setup.
The telescope was in perfect condition. No colour fringe was detectable at the sun's edges, just pure white when observed with the Baader film filter.
I suppose I just need more time to fine tune the setup, as described in my last message.
pts
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