From: Bruce Walker
On 11-08-25 3:55 AM, Larry Colen wrote:
On Aug 24, 2011, at 9:17 PM, Ken Waller wrote:
I've resisted the jump to newer Pentax models and continue to use
a K20D with a K10D as backup. From a cost vs benefit standpoint
I'd be hard pressed to reccommend the K5 unless you really need
the few siginifcant advantages it has - high ISO performance
being the main one IMO. The K20D is available relatively cheap
and does a good- not great job.
Advantages of the K-5 over the K20: (off the top of my head)
High ISO noise Dynamic range size usable auto focus
Make that "faster auto focus"
usable auto metering
Make that "more predictable auto metering"
Buffer size frame rate
But, if you're shooting in relatively static conditions, with good
light, the K20 does a great job.
Saying that the K20's AF and AE are _unusable_ is *way* overstating
the case. *I* use and rely on them. Yes, AF can be annoyingly slow,
especially with SDM in low light. But it works and is accurate,
just as I'm sure the K10 and *istD models are.
Ok, that leads me to a question regarding the K-5's AF vs K20D AF (or
K-7 or K-whatever).
I'm not using DA (or DA*) lenses for the most part other than the
DA18-55II kit lens (older style with the metal flange) that came with
the K20D.
The rest of my kit consists of the older screw drive AF lenses - mainly
the two Tokina AT-X zooms 28-70f2.8 & 80-200f2.8 and a Sigma 300f2.8. My
other "go to" lenses are all A* primes - 24f2.8, 35f2, 100f2.8 macro.
I have some other AF lenses, but the point is, all of my AF lenses are
screw drive, none of them having SDM.
Does the K-5 offer me any AF advantage using my existing lens kit?
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