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Dang! I was going to sell it!
Posted By: rfortson, 01-28-2007, 08:22 PM

I was planning on selling this cheap 2x Vivitar teleconverter, but I stuck it on my SMC 300mm f/4.0 and pointed it at the moon. This is what I got:



A little bit of fringing, and not the sharpest picture, but not bad for wide open. Also gave me a chance to try out my new tripod/monopod combo with ball head, and it worked like a charm! The moon was basically directly overhead, but the ballhead held firm with the camera and ~2 lbs of glass hanging off of it.

I guess I'll have to keep the TC. It's pretty convenient and easy to stick in your pocket.
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01-28-2007, 08:46 PM   #2
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Not a bad shot- what shutter speed were you using? I have a feeling that the only reason this shot is a bit blurry was that your tripod (like mine) was probably shaking.

I also took a few shots of the moon on Friday using my SMC K 500mm with the same Vivitar converter! Wide-open, but without the TC, I got an extremely sharp shot. When I put on the TC, IQ fell dramatically, even at a slower aperture. See here for more details: https://www.pentaxforums.com/forums/post-your-photos/2641-new-lunar-shots.html

I've also learned that shutter speed is much more important than aperture value in these lunar shots. I'll do a bit more experimenting next weekend, but so far I've found that the fastest shutter speed possible coupled with wide-open aperture works the best.

I'm currently using a gearhead, but I didn't want to run the risk of smashing 7 lbs of glass, so I waited until right before midnight to get the shot. IMO a ballhead would have been a bit more handy, but the 500mm has a built-in sight on the top, so that helped a lot with actually finding the moon at 1000mm

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01-28-2007, 08:53 PM   #3
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Hi Mo,

I think this shot was a 1/50sec. I had another that was at 1/60s, but it had crept out of the center of the frame. This was the one that was closest to the center, and I figured that was the sweetest spot I was going to get on this setup.

The tripod was pretty steady and I used the 2-second timer with a remote release. However, ALL the weight was on the ball head since the moon was almost directly overhead. That's a tough task with 2lbs of glass hanging off at an angle, so the ball head could have been moving a little bit.

I also tried with my Sigma 135-400 without the TC, but I messed up the metering and all the shots were severly overexposed.
01-28-2007, 10:28 PM   #4
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Wow, that's really something! Were you using SR?


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01-29-2007, 11:07 AM   #5
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what did you use to add the 600mm into the exif??
01-29-2007, 04:19 PM   #6
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QuoteOriginally posted by roy Quote
what did you use to add the 600mm into the exif??
Shake reduction...and yes, I always forget to turn it off. Mainly because I always forget to turn it back on.
01-29-2007, 05:06 PM   #7
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QuoteOriginally posted by rfortson Quote
Shake reduction...and yes, I always forget to turn it off. Mainly because I always forget to turn it back on.
what did you use to add the 600mm into the exif??

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