Search:

If they do, I would hope it would have different adjustment values for different focal lengths, different focusing distances, and different apertures - since I know the focus shift present due to...

That's the answer I was looking for, thanks! Although one other quick tidbit: since depth of focus does change with aperture, I'm assuming it always measures from full aperture? That would make the...

So I have a simple question about autofocus microadjustment on the bodies that have it.... the values that you dial in to calibrate lenses, what do those actually refer to? They aren't just arbitrary...

I work in a camera store selling photo equipment. Long story short, someone came in who is a member of CPS, and he said that the employees at CPS view the 24-70L classic as "the worst L lens ever...

Hmm true. I'll check it out with my 35-70 (which is also very sharp). Too bad the 40D doesn't have AF microadjustment...

Manually focusing doesn't help, so its not an AF accuracy issue. And stopping down helps a little, but I bought this lens to use it at f/2.8, so I'd like to be able to shoot wide open at f/2.8 and...

The other day, my 40D and 24-70 took a tumble onto concrete from a height of about 5 feet. Everything seemed mostly fine at first. The hood was cracked, which I glued back together, and one part of...

Never mind, fixed it! AF mode has to be set to One Shot, NOT AI Servo, for AF assist to work. Hope this helps others with this issue.

Hi gang, I'm having a bit of difficulty... for the life of me I can't get the AF assist on my 430EX II to fire when mounted to my 40D. I've made sure the custom functions on both the body and lens...

I just got my pre-owned Canon 70-210mm f/3.5-4.5 USM in the mail the other day. This is my second copy because my first copy eventually had its aperture blades begin to stick and refuse to stop down....

Just arrived in the mail yesterday was something that I couldn't resist getting - a lightly used Canon 70-210 f/3.5-4.5 that I found on B&H for a great price. Supposedly this lens was made from...

Oh, more about the testing:


It was definitely axial CA because it gradually got better as I stopped down from f/1.4 to f/5.6. It also appeared all over the frame, not just in the corners....

As I understand it, axial CA improves from stopping down, but lateral CA doesn

Hmm. Interesting. I

Interesting, thanks for the info guys.


I

It seems on shots where I was more backlit there was more CA. Which would make sense due to the high contrast border between the player and background, but I guess I was just shocked because I...

Notice all the bokeh and axial CA in the above photo. This was shot with my Rebel T1i and Canon 50mm f/1.4 USM. I was looking at Bryan

/cfs-file.ashx/__key/CommunityServer-Discussions-Components-Files/8/3716.CA.PNG

The T1i has a special center AF point that has enhanced sensitivity when using lenses with a max aperture of f/2.8 and faster. As a shooter of Canon

I was talking about equivalent focal lengths when I said what I said - shoot a subject with the 60mm f/2.8 Macro on a 50D and the 100mm f/2.8 Macro on a 5D and look at the background and calculate...

Wish I could do that with that stupid live view button on my T1i, I have it disabled because I NEVER use it but wish I could set the button to something else...

The T1i is not fully automatic for stills, quite the contrary... I have a T1i and its a great body. The only features I wish it had are ones found on the 50D.


First of all, I would not recommend...

Personally I don

Thanks, that was the answer I was looking for, and I see how it makes sense. As for the DOF advantage, crop bodies would have it, but you can also stop down full frame cameras farther before...

I was just wondering, the MM spec for EF lenses, would that be different if the lens was mounted on a 1.6x crop body for example? I've been studying the diagrams and formulas in this old photography...