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cloudsweeper

Bulging Craters, Anyone??

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Posted (edited)

Splendid views of Clavius in the heavily-cratered southern highlands near the terminator yesterday - the arc of craterlets of decreasing sizes within, plus lots of very small ones. 

Anyway.  I have occasionally seen lunar photos and thought the craters appeared to be convex/bulging, and put it down to the lighting conditions, never thinking it was in fact my perception, until that perception changed.  The pic attached is one such - the effect may or may not work with this image.

And last night, while enjoying Clavius and environs, I saw the effect with the Moon itself!  Clavius and all the craters around it all got reversed and bulged out, changing the landscape completely.  A very strange effect, and one I have not experienced before.  Very odd and very interesting - at one point I was able to flip the view more or less at will!

There must be lots of veteran Moon-viewers out there who have seen this (please let me know!), although I don't recall any references to it.  It certainly came as surprise!

Doug.

(Bresser Dob, x212.)

P1070037.JPG

Edited by cloudsweeper
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32 minutes ago, cloudsweeper said:

Splendid views of Clavius in the heavily-cratered southern highlands near the terminator yesterday - the arc of craterlets of decreasing sizes within, plus lots of very small ones. 

Anyway.  I have occasionally seen lunar photos and thought the craters appeared to be convex/bulging, and put it down to the lighting conditions, never thinking it was in fact my perception, until that perception changed.  The pic attached is one such - the effect may or may not work with this image.

And last night, while enjoying Clavius and environs, I saw the effect with the Moon itself!  Clavius and all the craters around it all got reversed and bulged out, changing the landscape completely.  A very strange effect, and one I have not experienced before.  Very odd and very interesting - at one point I was able to flip the view more or less at will!

There must be lots of veteran Moon-viewers out there who have seen this (please let me know!), although I don't recall any references to it.  It certainly came as surprise!

Doug.

(Bresser Dob, x212.)

P1070037.JPG

It happens fairly often to me and I just have to look away from the eyepiece for a few seconds..:smiley:

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I didn't experience the effect last night but I had the problem, if you can call it that, last month. Like you, it happened looking at the heavily cratered area around Clavius. It was so bad at one stage during that particular night that I had problems seeing the craters as concave. They just kept jumping back to convex at almost every viewing after looking away. A curious and confusing at first optical illusion. The mind plays tricks eh.

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