I am really hating my Canon 24-70 past 1 meter, please help

E

Ed Ng

Active member
Hello everyone, I am really having a lot of trouble with a clean focus past 1 meter or so. My Panasonic BT-LH80 says a lot on the 1 to 1 pixel and can not pull a great focus past a few feet. Although I am using the Kipon which I know is not the best adaptor, it seems to be the lens.

I love the AF100 but now kind of miss my HPX170 BUT I have not bought any dedicated glass because I use my photography lens.

I just did a shoot and was at f11 hitting two litepanels at 400 ISO from 6 feet away and could not narrow down the focus. I could not get any closer to my subject which hurt the shot but I really did not expect the lens to fall off the way it did. I did use a scene file I should not have by mistake and just ran a test, the scene file makes the focus more critical but still should pull focus better.

Any help, suggestions, alternative lens, advice, a gun to shoot myself or constructive comment would be appreciated.

Cheers

Ed
 
Don't think scene file has anything to do with focus, nor am I clear on what you mean by having a stop set at "f11 hitting two litepanels at 400 ISO from 6 feet away and could not narrow down the focus". Do you mean that you were in auto-iris mode with the camera pointing at the the light panels hoping to achieve a higher aperture and thus greater depth of field? Also, what lens were you using? Sounds like a lens/lens mount/backfocus problem. Also, be sure your ND filter wheel isn't in a 'tween' position. You'd see a 'ND NG' display if that were the case. Also you could be trying to focus inside your lens minimum focus distance.
 
Why do you assume it's the lens and not the adapter? When you use the lens on a still camera, does it focus to infinity? If so, it should be able to do the same on your AF100 if the adapter is in spec.

I would always suspect the cheap, no-name adapter rather than the precise, expensive Canon and Panasonic components unless you absolutely can prove otherwise ... and failure to focus past a few feet is a symptom of an adapter that's a sconce too long.

The scene file couldn't affect this at all.

- Greg
 
If you had the 24-70 on the AF how could you set aperture to F11? There is no adapter on the market that can adjust for this with EF lenses on micro 4/3.

I've tried the 24-70 on my camera and I didn't like. It was kinda dull.
 
editman said:
If you had the 24-70 on the AF how could you set aperture to F11? There is no adapter on the market that can adjust for this with EF lenses on micro 4/3.

I've tried the 24-70 on my camera and I didn't like. It was kinda dull.
Click to expand...

I think everyone kind of hit it on the head but Editman said it was kinda of dull which is what I feel. I was assuming it was the lens but may be the adaptor because it does not hit infinity very well.

What I mean by f-stop was the aperture or iris setting. As for setting aperture to F11, I use my Canon camera to lock down the f-stop using the dof button and then I release the lens. This keeps the iris in its proper setting.

Greg, I would really like a good adaptor and thought "Kipon" was good, $200 was not cheap for me although I have seen some for much more money. I do not know what the spec of the adaptor should be so it has only been an education on my part.

I will do a test and post it tomorrow if I get a chance. I hope it will be comprehensive enough as I will use my light meter, a ruler and speak while showing the test but this may all be an exercise if it is the adaptor.

Thank you for the input.

Cheers

Ed
 
Last edited:
I may be wrong, but I know for fact on some lenses that once you get past the sweet spot, they tend to get soft and dull, Im not sure what the best setting for sharpness is on that lens, But that may be something you want to look into. Some of my lenses appear much sharper between say f4 -f8, then peter off, So maybe try to find the sweet spot and work within it's perimeters using nd filters.
 
You must log in or register to reply here.
Back
Top