I noticed front focus on my FA 50/1.4 when I first got the K20D and I was playing around shooting bottles on my bar at f2. I focused on the label of my Scotch bottle and it was out of focus, but the closer water faucet handle was in focus. That was the lens that called for the most correction, -4. I see tremendous improvement in the results from that lens. My other lenses were all 2 points or less off. I hadn't noticed any problems with them but had used them only sparingly on the K20D. I now want to see if my FA50/1.4 is accurate on my K10D. I'm not sure that it ever was, but I rarely shot with it wide open, so it's tough to say. Paul On Mar 8, 2008, at 2:09 PM, Ken Waller wrote:
> Same question to you Paul... > Could you tell visually, before correctiion that you had a focus > issue? (I'm > meaning before checking focus with a target) > If so, can you now see an improvement? (when shooting something > other than > the target) > > Kenneth Waller > http://www.tinyurl.com/272u2f > > ----- Original Message ----- > From: "Paul Stenquist" <[EMAIL PROTECTED]> > Subject: Re: K20D & AF calibration data > > >> So far, of four lenses tested, my largest derivation was the FA50 at >> -4. I had a couple pluses and a couple minuses. >> Paul >> On Mar 8, 2008, at 12:06 PM, Dario Bonazza wrote: >> >>> By using Tim Jackson's chart (thanks Rick for reminding me that!) >>> I've got >>> the following calibration settings for the K20D: >>> >>> DA 12-24 = -6 >>> DA 16-45 = 0 >>> DA* 50-135 = -3 >>> >>> FA 31 = -10 (and it's not enough!) >>> FA 50/1.7 = -10 >>> FA 50/1.4 = -10 >>> FA* 85/1.4 = -9 >>> FA 24-90 = -6 >>> >>> F* 300/4.5 = -4 >>> >>> So my lenses are all front focusing, and not a single one is back >>> focusing. >>> Or maybe my K20D is acting that way. >>> It will be interesting to know how much variation one can find with >>> the same >>> combos made up of different items. >>> >>> Cheers, >>> >>> Dario > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above > and follow the directions. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
