The Nature of USM focusing

sjprg · #8 03-26-2009, 03:46 AM

OK I'll contact you when the camera is returned from Canon.

sjprg · #9 03-26-2009, 07:04 PM

Fed-EX dropped off the camera about an hour ago. I went out in the street with the 16-35II and rattled off 77 shots @ f2.8 panning rather rapidly. Not too scientific but all shots were 100% in focus using AI servo and the ring of fire. So far so good. I'll know more after my hike this weekend.

Dennis_Vied · #10 03-26-2009, 08:01 PM

Great. Ours went out this afternoon.

Noel_Carboni · #11 03-27-2009, 12:07 AM

Just FYI, I was way more impressed with the el cheapo 50mm f/1.8 than with the "higher quality" 50mm f/1.4 I replaced it with.

I shot some stars with it at f/1.4 and was absolutely appalled with the results.

Not Canon's best lens for sure.

-Noel

Dennis_Vied · #12 03-27-2009, 11:42 AM

Do you think it was inaccurate focusing, or other factors like fringing? I wouldn't think it would be adequate for an astro lens, and that likely was not a design goal for it.

We decided to order the Zeiss ZE 50mm 1.4. I'm sure the Canon 1.8 is a good lens, but the environment is a rigorous one and I think the Zeiss is the way to go.

Dennis_Vied · #13 04-08-2009, 12:49 PM

Got the 1DsIII back yesterday, (great and speedy Canon service), and the Zeiss lens arrived last week. Tests will be flown as soon as the weather improves a bit.

sjprg · #14 04-08-2009, 01:29 PM

Dennis: I'm having a problem creating a new thread or contacting the webmaster. Could you please pass along this errormessage. Thanks
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