self focus adjust

Started Feb 11, 2007 | Discussions thread
Pete Fang Senior Member • Posts: 1,900
Re: incandescent light

sinahua wrote:

all my glasses have the same focusing quality, as far as i tested.

under daylight, they all focuses very well. however, under
candecent light, i need to adjust the focus correction to -80 um to
reverse the front focusing. all my glasses ff under candecent light.

I did some test late last night with the FA* 85/1.4. It always front-focus under incandescent light on the *ist D and the K10D. In the service menu, I had to register a -140 um for a totally accurate AF compared with manual focus using split-screen. However, under natural sunlight this morning, I can clearly see that at -140 um, the 85 would back-focus quite a bit. In fact, in my brief test, the 85 did alright when I put the calibration back at the value of "0".

Peter

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Peter Fang - Pentax user for more than two decades: K10D / *ist D / MZ-S / Z-1 / SFX / LX

 Pete Fang's gear list:Pete Fang's gear list
Pentax K-5 Fujifilm X-Pro1 Fujifilm X-T1 Fujifilm X-Pro2 Pentax K-1 +13 more
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