F/8 Autofocusing impressions

[tron]

That's the problem with 3rd party manufacturers. I have a nice Tokina ATX-28-70 f/2.8 which stopped working since my analog days Canon 50E. It continues to work fine on the old 6xx series and my EOS1n though!

Regarding teleconverters however I guess Canon could have done better.

Even if not regarding the f/5.6 constraint at least regarding the design that limits the Canon TCs use on specific few lenses.

 

[Tom W]

When I bought the Kenko (which still works fine), the primary purpose was to allow AF with an f/8 combination on the 5D2. I soon bought the 5D3 and found the performance to be very good with it at f/8.

I've also got my Canon 1.4X II and 2X teleconverters still - no need to get rid of them.

As for micro-adjustment - I just haven't taken the time to perform that function at all with the 5D3, though I probably should at least with my longest lens combinations. There are a lot of competing variables that conspire to degrade image quality when shooting with long lenses (camera shake, etc.) so having the absolute best AF precision would seem to be more critical.

 

[Marsu42]

That's the problem with 3rd party manufacturers.

I'd say this is the problem with *2nd* party manufacturers (I guess the 1st party is us, the customers) - it would be no surprise if Canon, Nikon or whatever changes specs and didn't open their protocols just to +1 their own equipment. Luckily, the 3rd party just got smarter and Sigma now has an usb dock for lens fw updates...

 

[tron]

That's the problem with 3rd party manufacturers.

I'd say this is the problem with *2nd* party manufacturers (I guess the 1st party is us, the customers) - it would be no surprise if Canon, Nikon or whatever changes specs and didn't open their protocols just to +1 their own equipment. Luckily, the 3rd party just got smarter and Sigma now has an usb dock for lens fw updates...

That's a very welcome addition! Let the (lens manufacturers) competition begin

 

[adhocphotographer]

I havn't had a chance to try this yet, but i am looking forward to!