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01-21-2010, 09:27 PM   #1
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Success with the SMC 1000mm f/8

Finally got some calm conditions and went out to shoot the moon with my "new" lens, the Pentax SMC 1000mm f/8. Here are some background posts on the lens:

https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/86837-1000mm-goodness.html

https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/87397-7-large-...0mm-f-8-a.html

The second thread talks about my trouble in getting sharp shots with this lens since it's so long and subject to the very slightest shake. Tonight was my best night shooting with it so far. I shot in manual, f/11, ISO 200, 1/10s using the wireless remote for 3s mirror lockup. I also shot both with and without SR (though the camera only recognizes lenses up to 800mm for manual input), and couldn't really tell the difference. Here's one of the shots, cropped (and resized for here - go to my Flickr stream to see the fullsized shot) and processed in LR to remove a touch of yellow fringing.



Anyway, it's a lot of fun when the image comes together.

01-21-2010, 09:30 PM   #2
Ash
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Looks as good as it can be at this resolution (perhaps a little overexposed at the bottom pole), and the CA is only slightly noticeable here.
A good result overall.
01-21-2010, 09:40 PM   #3
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QuoteOriginally posted by Ash Quote
Looks as good as it can be at this resolution (perhaps a little overexposed at the bottom pole), and the CA is only slightly noticeable here.
A good result overall.
The pole is bright, but it's not clipping, so I think it's just inside the exposure box. I was mainly aiming for something sharper than I'd been getting and this is it.
01-21-2010, 10:29 PM   #4
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Forget the clipping, exposure and all that camera stuff. I look at it and feel like I'm in a capsule orbiting a few thousand miles up. Fine shot. Now its off to your Flickr page.

01-21-2010, 11:02 PM   #5
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Excellent shot Russ! I saw that same moon tonight, but it was a bit cloudy.

Did you use LV to zoom and manual focus, or did you find that you didn't need to? Also, did you stop down to f/11 for optical reasons, instead of using a faster shutter speed? It seems to have worked for you since I don't see any motion blur.
01-22-2010, 05:51 AM   #6
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QuoteOriginally posted by PentaxPoke Quote
Excellent shot Russ! I saw that same moon tonight, but it was a bit cloudy.

Did you use LV to zoom and manual focus, or did you find that you didn't need to? Also, did you stop down to f/11 for optical reasons, instead of using a faster shutter speed? It seems to have worked for you since I don't see any motion blur.
I used the VF. I tried LV for some other, earlier shots, and it really jumped around. I probably should have tried it for this shot as it was really calm.

Wide open is f/8 on this lens, so I just stopped down to f/11 figuring it might sharpen it up a tad. No real experience saying that it does. Now that I know I can take a shot like this, maybe I'll repeat with some more defined conditions.
01-22-2010, 09:57 AM   #7
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Try it wide open and with faster shutter.
My ED refractor is 900mm f 7.5 and depending on conditions I shoot anywhere from 1/180 to 1/750.
Main reason I keep the shutter speed up is to try to minimize effects from atmospheric turbulence.
Nice shot by the way.

Cheers, Mike.
01-22-2010, 10:01 AM   #8
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QuoteOriginally posted by rfortson Quote
I used the VF. I tried LV for some other, earlier shots, and it really jumped around. I probably should have tried it for this shot as it was really calm.
I notice that too when I shoot through a telescope with live view, and the LCD zoomed. It shows how much motion is caused by just slightly touching the focus mechanism, even on a massive telescope tripod! It seems to me to be the best way to "nail" the focus through the scope.

01-22-2010, 10:14 AM   #9
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Nice work, Russ! Ain't it fun?
01-22-2010, 12:22 PM   #10
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QuoteOriginally posted by Ex Finn. Quote
Try it wide open and with faster shutter.
My ED refractor is 900mm f 7.5 and depending on conditions I shoot anywhere from 1/180 to 1/750.
Main reason I keep the shutter speed up is to try to minimize effects from atmospheric turbulence.
Nice shot by the way.

Cheers, Mike.
Yeah, I do need to get the shutter speed up. I can get a couple of stops by doubling the ISO to 400 and opening the aperture to f/8. Just those two things would give me 1/40 to 1/60s. It's still clear here, so I may try again tonight.
01-22-2010, 02:59 PM   #11
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QuoteOriginally posted by rfortson Quote
Yeah, I do need to get the shutter speed up. I can get a couple of stops by doubling the ISO to 400 and opening the aperture to f/8. Just those two things would give me 1/40 to 1/60s. It's still clear here, so I may try again tonight.
Yeah...after all, it is the moon! Think desert landscape in full sun. Isn't there something called the "Luney 11" rule for moon shots... ISO 200, 1/250 @ f/11? You should be able to get the shutter speed up quite a bit more.

Steve
01-22-2010, 10:00 PM   #12
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Good to see you are getting better results with this now.
Looking forward to more refined results.
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