Actually, I did a version of this and sent my K10D to be corrected. I included my FA50 which they used for calibration and that lens always worked well. The problem is that the K10D did not allow different corrections for different lenses which is a problem that really can't be fixed by anyone. It's really frustrating to do a test and determine the precise nature of a problem that's impossible to fix.
On Fri, Sep 3, 2010 at 10:08 AM, Miserere <miser...@gmail.com> wrote: > On 2 September 2010 23:19, John Celio <n...@neovenator.com> wrote: >> You don't understand. My camera backfocuses like it was *meant* to do that, >> even after sending it back to Pentax twice (both times for other problems, >> but I asked them to fix this, too). The image will look sharp in the >> viewfinder, but when looking at the photo on my computer later it becomes >> apparent that, even though the focus locked on a particular subject (say, a >> person standing six feet from me), the sharpest part of the photo is just >> behind them. Something is misaligned, and Pentax/CRIS hasn't bothered to >> fix it, even though their repair papers said they did. >> >> When I'm focusing manually, I will sometimes take a few extra photos with >> what I see in the viewfinder slightly out of focus, hoping I'll find the >> sweet spot somewhere. >> >> I swear, if I didn't have so much Pentax junk here, I'd go buy a Nikon. >> >> John >> Stuck Being a Disgruntled Pentaxian > > I feel for you, John, as I've has similar problems. I'm going to > outline a procedure below so you can figure out exactly what the > problem is. First you need to print out a focus chart (well, you don't > *have* to, but it makes things a bit easier; if you don't use a chart, > focus on something continuous, like a floor, that will allow you to > clearly see back/front focus). I like Yvon Bourque's: > > http://www.k10dbook.com/newchart.pdf > > 1) Set you camera on a tripod and focus manually on the center point > in the chart (or whatever it is you've decided to use in place of a > chart), which I'll refer to as "subject" with the center of your VF > over it. > 2) Take a photograph. > 3) Rotate your focus ring to infinity, turn AF on and autofocus > (without moving the camera) using the central AF sensor (this is why > in point 1 you had to place your subject in the center of the VF). > 4) Take a photograph. > 5) Rotate your focus ring to the lens's closest focusing distance, > then autofocus on the subject again. > 6) Take a photograph. > > Now comes the annoying part: Repeat the above with a couple other > lenses so you have at least 3 to compare results between allowing you > to rule out the lens as the problem. > > When you review the images on your computer (you should have a set of > 3 for each lens), there are 3 possible outcomes: > > Outcome 1: The manually focused image is in focus but the autofocused > ones are back/front focused. > Outcome 2: The manually focused image is back/front focused but the > autofocused ones are in focus. > Outcome 3: All are back/front focused, although the manual ones could > be front and the AF one back, or viceversa. > > Ideally you would want Outcome 4: All photos are in focus. > > Depending on the outcome from the list above, and assuming results are > consistent across lenses, these are your camera problems: > > Problem 1: The AF sensor is miscalibrated. This is what the micro > adjust feature on the K20D and K-7 is useful for. It's an easy fix for > a tech, and maybe you could do it yourself with the K10D debug > program. > Problem 2: The mirror is misaligned but a lazy tech simply adjusted > the AF sensor to compensate for it. You need a tech to service your > camera. > Problem 3: The mirror is misaligned and the AF sensor is not > calibrated to compensate for the offset mirror. You need a tech to > service your camera. > > Hope this helped. > > Cheers, > > > > --M. > -- > > \/\/o/\/\ --> http://WorldOfMiserere.com > > http://EnticingTheLight.com > A Quest for Photographic Enlightenment > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. > -- Steve Desjardins -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
