K10D front focus test; is this a pilot error?

Started Dec 14, 2006 | Discussions
pstseng New Member • Posts: 12
K10D front focus test; is this a pilot error?

Hi,

I did the dreadful focus test and notice (what I preceive) some front focus with my 2 wk old K10D. This is how I set up my test.

http://www.pbase.com/pstseng/image/71655073

Basically, I am focusing on the left most AA battery. All pics are taken with 18-55mm on tripod, Av F/4; ISO 400; 33mm. The following are two shots of the results

http://www.pbase.com/pstseng/image/71655067
http://www.pbase.com/pstseng/image/71655068

As you can see, focus is clearly on the 2nd to the left battery. This is about 1/2 inch (ie the diameter of the battery) FF. I have a few questions.

Is this somethig I should worry about? Should I consider request the body to be recalibrated? Or is the FF within the tolerance ? Is the calibration a hard/delicate work which might damage the camera? Is my test sufficient to prove that the camera is FF?

After thinking about DSLR for a few yrs and finally decide to go with K10D, I have to admit I'm a little bit disappoint if it turns out to be FF on the camera.

Please advise!
Thanks!
Pstseng

kristian2000
kristian2000 Veteran Member • Posts: 5,615
Re: K10D front focus test; is this a pilot error?

Do you have a problem in everyday, real-life shooting? if no, why are you testing? If yes, send the camera back.

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Laurens Senior Member • Posts: 1,391
Re: K10D front focus test; is this a pilot error?

How did you focus on the battery? With one of the AF points at the end or focus and recompose?

Secondly IMHO you can't focus on a battery, it's round, so you don't know where the point of focus is to an accuracy better than (battery diameter) 2

Laurens

pstseng wrote:

Hi,

I did the dreadful focus test and notice (what I preceive) some
front focus with my 2 wk old K10D. This is how I set up my test.

http://www.pbase.com/pstseng/image/71655073

Basically, I am focusing on the left most AA battery. All pics are
taken with 18-55mm on tripod, Av F/4; ISO 400; 33mm. The following
are two shots of the results

http://www.pbase.com/pstseng/image/71655067
http://www.pbase.com/pstseng/image/71655068

As you can see, focus is clearly on the 2nd to the left battery.
This is about 1/2 inch (ie the diameter of the battery) FF. I have
a few questions.

Is this somethig I should worry about? Should I consider request
the body to be recalibrated? Or is the FF within the tolerance ?
Is the calibration a hard/delicate work which might damage the
camera? Is my test sufficient to prove that the camera is FF?

After thinking about DSLR for a few yrs and finally decide to go
with K10D, I have to admit I'm a little bit disappoint if it turns
out to be FF on the camera.

Please advise!
Thanks!
Pstseng

Albert Aguilar
Albert Aguilar Forum Member • Posts: 81
Re: K10D front focus test; is this a pilot error?

For a more acurate test, take a look at:

http://focustestchart.com/chart.html

It's intended for Nikon D70, but will work with every camera.

Best luck
--
Do not take life too seriously; you are not going to end it alive.

SteveB Veteran Member • Posts: 3,087
Re: K10D front focus test; is this a pilot error?

Just a thought, that very bright reflected light from a curved battery surface could play tricks on the AF as it's virtual image isn't on the surface of the battery. Anyone know for sure if this is ever a factor?

dieda Regular Member • Posts: 245
and some says the other way around... and a Q

There was another post done with a test chart showing FF, someone just suggested the battery-test...

But I posted actually to ask a question: the FF problem is an AF matter. So how comes no one who experience these problems describe how the AF was done? Was it actually manual focus with focus point confirmation? Was is a selected AF point (that would be the best)? Is there a post describing the MF confirmation point sensitivity? Like how much can you play around with the focussing ring to still get the red-square-blinks confirmation on a selected target?

Someone please enlighten me. Or put down a strict list how you can test this thingy in a nice way and what tolerance you should accept and what not. Given you are dissatisfied with real life pics... I am not with k100d, but I always need to check if the focus is on the target I wanted to pick.

TX.

David
--
http://www.dieda.freeweb.hu

dock
dock Veteran Member • Posts: 5,287
Re: K10D front focus test; is this a pilot error?

The focal length of the lens used on each camera is different and the f stop is different so the results are apples and oranges.

gavinhw Regular Member • Posts: 126
Re: K10D front focus test; is this a pilot error?

Assuming you used the center AF point, and that you held focus, you're basically getting something similar to what I'm experiencing with my 16-45mm.

Provisionally, looks like you have a FF issue. Worth investigating.

As for me, it matters because my photos don't look as sharp as they could be.

OP pstseng New Member • Posts: 12
Re: K10D front focus test; is this a pilot error?

Yes! I am using center focus point. It's auto focused and focus is locked when I press the shutter....

Alfisti Veteran Member • Posts: 6,649
Re: K10D front focus test; is this a pilot error?

Did you re-compose though?

If no, as I said, you have a problem.

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