2 Important K10 Issues that need to be settled for good!! (Please read!)

Started Jan 5, 2007 | Discussions thread
Brett St Pierre
Brett St Pierre Veteran Member • Posts: 7,033
Re: Sinan, Brett

JeffJS wrote:

Brett St Pierre wrote:

JeffJS wrote:

Brett, Yes, I'm aware that contrast is required for AF to work
reliably. Your description though Might serve to explain why it is
that the kit lens (f3.5) and the Tamron Di 70-300 rarely fail. That
is, if I understand what you're saying correctly.

Yes, you are understanding me correctly then but my proposal is
still speculation that gets debated here as I said. On the other
hand, a night bright viewfinder from a fast lens with small DOF is
a better way to manually focus!

This theory and discussion has me wondering... The FA 50 is meant,
or designed to be used, on a film camera. Whereas the DA Kit lens
as well as the Tamron Di are both meant for digital (using examples
from my own camera bag). What I'm wondering, is if the larger image
circle on the FA has stray light bouncing around inside the camera,
tending to confuse the AF system on the camera. These 3 are the
only autofocus lenses I own at the time so I can only go by what
I'm seeing (or not seeing)..

Nope, don't think so. I have a number of fast lenses for 35mm film format and I haven't had an issue with them (and very rarely the 50/1.4) but all of them a more contrasty in themselves wide open (e.g. 31/1.8 and 77/1.8)....

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Brett
http://www.pbase.com/shreder

The Journey is the Thing

 Brett St Pierre's gear list:Brett St Pierre's gear list
Pentax K-1 Pentax smc DA* 55mm F1.4 SDM Pentax smc DA 15mm F4 ED AL Limited Pentax smc DA* 50-135mm F2.8 ED (IF) SDM Pentax smc DA 21mm F3.2 AL Limited +7 more
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