On Apr 22, 2006, at 10:00 AM, Denny B wrote:
I am anticipating purchasing a Pentax Digital DS2 body.
Can I use my manual Pentax lenses I have collected over
the last 35 years on the DS2 body, Some lenses
are A-lenses, some are just SMC non A-lenses.
Can I focus these lens manually and observe through the viewfinder
that the lens is focused but even though I manually focus
still get electronic signal (light or beep ) that the lens is
focused?
Yes. It's generally best to ignore the focus confirmation when
working with fast lenses, however.
Can I use all light metering functions ( matrix, center weighted,
spot ) with the A-lenses and some metering functions with the non A-
lenses.
A lenses obtain all metering functions, both ambient and flash.
Pre-A lenses get spot and centerweighted, work fully in Manual or B
exposure mode. (They also work in Av but only wide open, and all
other exposure modes default to Av.) Instructions for using pre-A
lenses:
---
M/K-Bayonet lenses without an A position on the aperture ring can
only be used in Manual exposure mode, effectively. They'll also work
in Av mode but only at wide-open aperture. To use them:
0: set the custom function for Using Aperture Ring to "permitted". Do
this once and leave it that way.
1: Set camera to Manual exposure
2: Frame and focus on subject
3: Set desired aperture on the lens
4: half press shutter release to activate the meter.
5: frame subject, press AE-Lock button to take a meter reading
(lens will stop down briefly and the correct shutter speed will
be set)
You're ready to take a picture.
The built-in flash with pre-A lenses operates unmetered at full
output; Pentax-dedicated external flashes will support TTL metering
on the DS/DS2. There's a table in the instruction manual with guide
numbers to allow you to set the aperture per distance.
Godfrey
