Do you have a cat? I had this once, and found out my cats fur was occupying the space where the cpu fan used to be.
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So, I promised to come back to this topic when my Kenko 3x extender got in. And its in. Its throwing lens errors however, so I had to fiddle around a lot before I could get it to make pictures.
When no lens is attached it errors, and with the Tamron 150-600 it errors. It does however work fine with the 85mm. So i'm not sure whats going on.
I ended up taping up all the pins on a 12mm extension tube, and put that between the body and the kenko.
The moon is still a bit low right now for the best shots (humid air and all that), but I shot a video to show what the field of view is on this combo.
Here is the link: http://youtu.be/Xhz4ux7F8BQ
Moon is bit higher now. i did a shot with and without the kenko from the same position. Lens fixed on the tripod.
The fringing on both setups is about the same. These shots were set to b&w because I like the moon best that way. Apart from that and cropping I did nothing.
Just to point out...the moon is out of focus there. Which is expected, since you used an extension tube...that kills infinity focus in favor of closer focus than the lens' default MFD. You wont' be able to sharply focus the moon until you remove the extension tube.
Really awesome how the first two pictures in this topic have the exact same shadow line on the moon.
I've bought a 3x extender to pair with my 150-600mm for some moon shots. Its still in the mail. I hope it gets here on a clear night so I can snap pictures of the moon. It will give me f/tiny however, so I'm not sure how it will work out.
Two people taking a picture of the same thing at the same time....that could explain why they look the same
I would love to see the shots through your 3X extender... Please post them for us when you get some....
Do you find yourself switching a lot from your 24-70 zoom to your 85 prime for the additional reach? If so, that would be another vote for the 24-105, in addition to the other recommendations already posted.
I'm on my second 24-105, and really appreciate the extra reach beyond 70mm. (I also have 50- and 100mm primes.)
Are you limiting your options to only Canon lenses?