focusing accuracy?

[l_n_h]

hello,

i realised that my image is sharper when i zoom in, focus, zoom out and take the shot, compare to just taking the shot at wide angle. is this normal? focusing accuracy depends on lens or body?

[bariq]

Originally Posted by l_n_h hello, i realised that my image is sharper when i zoom in, focus, zoom out and take the shot, compare to just taking the shot at wide angle. is this normal? focusing accuracy depends on lens or body?

Its not normal, you should achieve focus lock on any focal length. Check your AF setting, if its in M/C-AF/S-AF mode. Put it in S-AF mode and try to shoot again. Focussing accuracy depends both on lens and body, its a combination of both.

[pscion12]

Sounds like you have the same problem as I have with my Pentax film cam. There is an article about it but I don't know how it applies to Olympus though..da af article

[doubliewkay]

I have the same issue with E-300 and kit lens.
Especially night shots, I'll need to zoom in, focus, zoom out to take a sharp image.

I usually set my settings to S-AF.
Anyone else experiencing this?

[tao]

is this issue the same as backfocusing?

my question is, can this lack of sharp focusing be seen on the viewfinder?

otherwise, using the said technique described above will be guesswork.

[l_n_h]

i also usually set to s-af mode. i think i read somewhere that at wide angle, the focus tolerance is lower than at teleport. is it true?

anyway, i dun think is backfocusing. if i zoom in, focus, then zoom out, the focusing is accurate. back focusing is when you focus on something but the camera focus on something behind it.

[rionie]

Originally Posted by l_n_h i also usually set to s-af mode. i think i read somewhere that at wide angle, the focus tolerance is lower than at teleport. is it true? anyway, i dun think is backfocusing. if i zoom in, focus, then zoom out, the focusing is accurate. back focusing is when you focus on something but the camera focus on something behind it.

Dear I_n_h,

If you have used manual focus before, you would have to master this traditional technique. E-300 and E-1 use passive AF system. This type of system depends a lot on the contrast of the focusing point. Now, I think you got the answer already. If you let the AF sensor to get closer to the focusing point with zoom-in, it will definitely give you a better result. It is especially true in case of less contrasty or dim object.

Of course, there is still a certain limit for the validity of the above explanation. If the object is contrasty enough and the lighting is normal, you normally don't need to zoom-in first.

[nightpiper]

Originally Posted by l_n_h ... if i zoom in, focus, then zoom out, the focusing is accurate. back focusing is when you focus on something but the camera focus on something behind it.

can meh? this is the biggest thing i can't get used to. last time with my nikon, i zoom in, then focus, then zoom out. but with the Oly kit lens, it doesn't work. i heard thats becos its a different optic design. has been practising MF with AF combo, the results r getting better.

[l_n_h]

Originally Posted by nightpiper can meh? this is the biggest thing i can't get used to. last time with my nikon, i zoom in, then focus, then zoom out. but with the Oly kit lens, it doesn't work. i heard thats becos its a different optic design. has been practising MF with AF combo, the results r getting better.

i am using a sigma 18mm - 125mm and it works. not sure about the kit lens