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Old 13-07-2019, 09:46 AM
Dennis
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Canon EOS R does the Moon and Apollo 11 landing site.

As we approach the 50th Anniversary of the Apollo 11 moon landing, last night I thought I’d attach the Canon EOS R to my telescope as the Moon beckoned through wispy clouds.

Here is what the EOS R saw (with overlay) with a full resolution 1200x900 pixel crop showing the region of the Apollo 11 landing site.

The telescope is a Takahashi Mewlon 210 (210mm dia mirror, at F11.5) although I reduced the focal length to 1932mm by fitting a x0.8 Focal Reducer/Flattener in the optical train, to tame some of the off axis coma inherent in the design of the ‘scope.

I have also attached a couple of gratuitous crops where the image is more sharply defined towards the centre of the FOV.

Cheers

Dennis
Attached Thumbnails
Click for full-size image (Moon M210 0x8 EOS R 1-60 30 Frames ISO100 efl1932mm Apollo 11 Region Overlay Crop 1200.jpg)
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Click for full-size image (Moon M210 0x8 EOS R 1-60 30 Frames ISO100 efl1932mm Apollo 11.jpg)
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Click for full-size image (Moon M210 0x8 EOS R 1-60 30 Frames ISO100 efl1932mm FR1200 02.jpg)
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Click for full-size image (Moon M210 0x8 EOS R 1-60 30 Frames ISO100 efl1932mm FR1200 01.jpg)
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Old 16-07-2019, 09:15 AM
John W (John Wilkinson)
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Great images Dennis - the close up ones show some nice detail. Cheers , John W.
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Old 16-07-2019, 10:50 AM
Dennis
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Originally Posted by John W View Post
Great images Dennis - the close up ones show some nice detail. Cheers , John W.
Thanks John, I appreciate your comments.

For any other EOS R users out there, one crucial camera setting that I discovered during this session (surprisingly) is that Silent Shutter MUST be set to ON to avoid camera shake.

When I took the 1st series of images, I was dismayed to see them all blurred with what looked like a classic case of mirror slap; but as we all know, the EOS R is mirrorless.

I then set Silent Shutter to ON (in EOS Utility as I was tethered to my laptop) and lo and behold the images were sharp once more.

Here are some down-sampled Raw crops showing the difference between Silent Shutter ON and OFF. This was reliably repeatable as I toggled the setting between ON and OFF.

It makes me wonder if it should be ON even when using camera lenses (as opposed to a 1932mm fl 'scope) at lowish shutter speeds.

Cheers

Dennis
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Click for full-size image (EOSR6345 Crop 1200 Shake Comparison.jpg)
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Old 17-07-2019, 12:30 PM
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RB (Andrew)
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So sharp you could cut yourself on those Dennis !!
Simply amazing, wonderful imagery as usual.

I'm so surprised at your discovery about Silent Shutter set to ON.
Who'd have thought it would make such a difference on a mirrorless camera.

I'd be inclined to keep that setting on all the time.



RB
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Old 18-07-2019, 07:34 AM
Dennis
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So sharp you could cut yourself on those Dennis !!
Simply amazing, wonderful imagery as usual.

I'm so surprised at your discovery about Silent Shutter set to ON.
Who'd have thought it would make such a difference on a mirrorless camera.

I'd be inclined to keep that setting on all the time.



RB
Thanks Andrew, it really floored me when I first saw the blurry images coming down the pipe.

There is a mechanical shutter in the EOS R and I suspect it is related to vibration associated with its operation?

Cheers

Dennis
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Old 18-07-2019, 02:20 PM
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Derek Klepp
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Thanks Dennis and very interesting about the silent shutter.I wonder if there is a similar case to be had using telephoto lenses?I have restrained myself from buying one of these until my DSLRs become too long in the tooth.
Derek.
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