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Old Jun 17, 2008, 1:04 AM   #1
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Just experimenting again. On this shot I used the Canon 40D (1.6 crop sensor), the EF400 5.6L, the Tamron 2X extender, and a Sigma 2X extender -- for a total length of 2560mm.

ISO 1000, F11, 1/640 Shutter priority, Manual focus. Uncropped, slight sharpening.

A lot of noise due to the high ISO and the use of 2-2X converters.

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Old Jun 17, 2008, 1:10 AM   #2
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Then I decided to use the Tamron 2X TC and a Kenko 1.4X TC with the Canon 40D and 400L lens. Total length = 1792mm.

ISO 800, F11, 1/160th, Shutter priority. Manual focus. This was, of course, cropped.

Much less noise and, even though it was cropped, is somewhat sharper than the 2X by 2X setup.

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Old Jun 17, 2008, 4:49 AM   #3
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Thanks, Walter, for yet more fantastic shots, beautifully illustrating almost the whole Earthwards view, but still hinting at the existences of phases, with the tiny dark sector.

Does anyone know the nature of the clearly defined 'rays' radiating from each (supposedly) impact crater, gloriously illustrated in this 'challenge', especially in the second shot here.

(To save me looking it up on t'net or Patrick Moore's "Astronomy" book)? Are there any comparable features left on Earth?
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Old Jun 17, 2008, 12:04 PM   #4
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Nice shots and yes, I agree, the 2nd one is sharper.....

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Old Jun 17, 2008, 12:48 PM   #5
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Great photos, very cool.
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Old Jun 18, 2008, 12:23 PM   #6
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Great shots. As expected, the second shot is a bit clearer. The more glass you place between your lens and the camera or in front of the lens, the less sharp the image and the more light loss. Nonetheless, both shots are great.

I was hoping to shoot the full moon tonight but I don't think the weather is going to cooperate.:evil:

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