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Old Jul 31, 2007, 4:18 PM   #1
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I am having trouble getting sharp images from my E-300 camera coupled with a 1200 mm F-5 Dobsonian type scope. To add insult to the problem I get better images from my Fuji 2 meg fixed lens camera when coupled with the same scope with a 20mm eyepiece. Of course I focus through the E-300 eyepiece. With the Fuji camera I focus through the eyepiece and then put the non-focusing camera in place behind the eyepiece. My corrected eye sight is above average. I lock up the mirror on the E-300 and use a 6 second time delay. The scope has been tested to near the Dawes resolution limit and is colluminated properly.

I seem to get better E-300 results when coupled with a 600 mm f-9 achromatic refractor scope. Photo attached. My reasoning was that I should get the sharpest results with the 6 meg. camera directly coupled to a quality scope, instead I am rewarded with better results from a 2 meg. camera with perhaps an additional dozen lens elements between the scope objectives and the camera. Does not make sense. ???? Some of my questions are?

1.People say the E-300 focus elements are not the best in the world, especially
compared with the excellent focus seeing provided directly by the 20 mm eyepiece..

2.Although I lock up the mirror on the E-300 and use time delay, there is still the
mechanical shutter that rattles across the sensor at exposure. The small shutter in
the compact Fuji camera would produce less vibration. This might explain why I get
poorer results at the higher magnification of the 1200 mm scope.

Any ideas Please? An more tests I can do? Thanks a heap. Gene Smith


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Old Jul 31, 2007, 9:45 PM   #2
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Smithhill wrote:
Quote:
I am having trouble getting sharp images from my E-300 camera coupled with a 1200 mm F-5 Dobsonian type scope. To add insult to the problem I get better images from my Fuji 2 meg fixed lens camera when coupled with the same scope with a 20mm eyepiece. Of course I focus through the E-300 eyepiece. With the Fuji camera I focus through the eyepiece and then put the non-focusing camera in place behind the eyepiece. My corrected eye sight is above average. I lock up the mirror on the E-300 and use a 6 second time delay. The scope has been tested to near the Dawes resolution limit and is colluminated properly.

I seem to get better E-300 results when coupled with a 600 mm f-9 achromatic refractor scope. Photo attached. My reasoning was that I should get the sharpest results with the 6 meg. camera directly coupled to a quality scope, instead I am rewarded with better results from a 2 meg. camera with perhaps an additional dozen lens elements between the scope objectives and the camera. Does not make sense. ???? Some of my questions are?

1.People say the E-300 focus elements are not the best in the world, especially
compared with the excellent focus seeing provided directly by the 20 mm eyepiece..

2.Although I lock up the mirror on the E-300 and use time delay, there is still the
mechanical shutter that rattles across the sensor at exposure. The small shutter in
the compact Fuji camera would produce less vibration. This might explain why I get
poorer results at the higher magnification of the 1200 mm scope.

Any ideas Please? An more tests I can do? Thanks a heap. Gene Smith

You can use a piece of cardboard to cover the aperture (blocking but not touching)until the scope damps down.


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Old Aug 1, 2007, 10:00 PM   #3
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Hi Smithhill: I took 5 seconds to download your photo.I adjusted the contrast and gamma levels, and itimproved your photo. (see attached)

Have you tried different camera settings for contrast, saturation, sharpness, etc.?? You gave no indication of how you adjust your camera settings for your telephoto sessions.
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Old Aug 3, 2007, 9:21 AM   #4
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I posted an answer in the Olympus forum where you cross-posted
http://forums.steves-digicams.com/fo...mp;forum_id=22

Jorgen
http://www.photoblog.com/jorgen

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