Thanks again for your suggestions. I decided as I still have a warranty that I should let them check it again. This they did and told me that the camera was slightly forward focusing and that testing the camera with the chart in a position where the camera is pointing down at a 45 degree angle will not give an accurate result and that they place the chart in an upright position and set the camera facing forward at a 45 degree angle to the side. I don't know what to say about this!!!

Can anybody explain this?

Focusing seems sharper now but the images at iso 100 seem noisier.

Thanks again for the replies

Thank you for your replies. I have looked at the hack info but the problem is that i have a mac and the software is for PC. I still have warranty but I am loath to let them touch it as they have tried twice already and it's still not focusing plus I thought to set the focus the camera should be set to centre point rather than the 11 point focus setting, I did this when testing, but both times when the camera was returned it was set to segment focus.
Can anybody tell me.Why???

I bought the 70mm Ltd expecting after reading many reviews that I would get sharp photo's,( it is supposed to be a sharp lens isn't it???), but they are soft and lacking detail I mean my daughter has cotton for eyelashes soft. Atleast before when I shot at 2.4 there would be some point in focus even if not the centre. Is it possible to over adjust it??

Any helpful comments would be much appreciated.

I recently purchased a 70mm f2.4 ltd lens for my k10d and found the out of focus. I use centre point focus and wide open. The images were out of focus in the centre. I went back to the shop and he took a photo of text at an angle and it looked ok so he refused to change it. It wasn,t until I had left the shop and checked the data that I realised that he had set the f stop to 3.5. So I downloaded the test sheet for checking focus, everything as per instructions and found that my camera was backfocusing 25mm. Fortunately my equipment is still under warranty so I asked Pentax to check it and they found both lens and body to be backfocusing. They fixed the lens there and then. Can anybody tell me how? They kept the body for 2 weeks. I collected the body yesterday and when I checked it was front focusing about 20mm so I went back and they checked and it was front focusing. They said they could repair it in 10 mins. After all this I still have a camera that is still front focusing about 10mm and since they did this ten minute fix the photos all seem to be under exposed by about 1 stop. Also when I zoom into the photo the centre doesn't seem to be in the centre. The Focus here marker that I fix the centre point on moves down the screen when I fully zoom in. I have read that the focus is adjusted using software through usb connection. How does it work? Is the center point marker moved to a different position? And why would the Pentax technicians use 11 point setting to set the focus?? If any body could answer these questions I would be very grateful.

k10d, Pentax50mm f1.4, 70mmf2.4 Ltd, Sigma 17-70mm f2.8

Thank you for your help. I have since taken some shots in a high contrast situation at different f stops from f1.4 up with the 50mm lens and decided that when wide open it suffers from terrible CA in high contrast situation when wide open. eg tree branches against a bright sky are completely purple. Being a newbie i am probably using this narrow depth of field in the wrong situations. F2.8 is the widest lens I have used before.

Thanks for the info Pete. I have joined photobucket and uploaded an image.

I hope this can shed some light on the problem.






Mike

Thanks to all for the replies so far. Unfortunately I can't upload an image so the best I can do is give the following info from the first image I noticed this problem.

Shot as high qual jpg in low light

auto white balance, 1/20 shutter speed, 1.4 aperture, iso 100. Indoor - no artifical light.

I have noticed that this happens if there is a lot of greenery in the back ground/foreground.

but I'm afraid that without an example image this may be a fruitless exercise.

Thanks again for the posts.

I am quite new to digital photography so would be very grateful if anyone could give me advice regarding a problem I am having with my K10D.

I recently purchased a Pentax 1.4 50mm AF lens because I wanted to take shots of my 2yr old daughter. Some of the photo's are fine but occasionally my daughters dark brown hair and eyes have a purple cast. As a beginner I am not sure if this is an extreme case of CA. These shots are taken at 1.4. I also noticed this in shots of a building site mainly in the shadows.

I read somewhere that if there is a lot of green in the shot it can cause this effect.

Is this a white balance issue or a lens issue???
Any advice would be much appreciated.