I have had my Tamron 28-75 for a couple of months now. I love the lens, but I haven't been too terribly happy with the focus. I think I finally figured out it is front focusing. Here's an example:
1/160 f/2.8 800
I'm using the center focal point with focus on here left eye. The cup and her foot seem to be in focus, but her face is not.
Do you agree? Is there anything I can do about it?
ETA: I focused on her eye and then moved the camera for composition. Could that be the problem? Or is my ap too low with 2.8 and that's why when I recomposed it slightly moved out of focus? Guess I should do some test shots...
Last edited by Jeffininer; 05-07-2010 at 06:44 PM.
If you focused on her eye and then moved the camera, then the focus points have changed. Otherwise, I'm not sure why it would be doing that.
But for the baby session I just did, I have a whole set of shots that are totally front focused and it pisses me off!
Check it with this, just print out page 18. My kit lens back focused BADLY I spent a year thinking I was just horrible when it came to hitting the focus...lol.
Last edited by Andie7a; 05-08-2010 at 03:32 PM. Reason: Forgot Link...duh
Andie, that is really cool!
I was wondering if my 70-210 lens was doing something similar recently, but thinking about it, I ws able to get sharp results before and now everything is soft and mushy, and today the AF motor started making a horrible clunky noise. I know my lens is on it's way out. I have ordered a "new" second hand one off ebay, but I will do this test with it 1st seeing as I have 7 days to return it if I am not happy, so thanks for asking the question and thanks to Andie for that link.
thought I'd give a follow-up. I finally printed the test page and did some test shots. I know I wasn't exact with my angle, but I believe I followed all other instructions correctly. Maybe not having the exact angle makes this test null, but I figured I'd give it a try.
This is the result.
It looks like it is front focusing slightly. The bottom 2mm mark looks slightly sharper.