Following up from
my earlier post, I've had a go at using my newly-acquired Pentax K200D with old manual-focus lenses.
Now that I'm familiar with what's needed, I'm starting to get some decent results. Initially I had to work out a few things:
Using old lenses (I have one original SMC Pentax and two SMC Pentax-M lenses) requires operation in manual mode with stop-down metering. While I haven't tested it myself, I
think that lenses with an "A" setting on the aperture ring may allow operation in some of the auto modes, but I don't have any.
Fortunately, the K200D is fairly well set up for this. There's a custom function you set to allow shutter release with old lenses (Custom Function 23 "Using Aperture Ring" has to be set to "Permitted"). Once that's done, and the mode dial is set to M, things proceed pretty smoothly. When you turn the camera on with the lens in place, you are prompted to set the focal length of the lens (and, yes, it does remember the value set the previous time). That changes the focal length recorded in EXIF data and also, at least to my eye, seems to alter the metering (and in a good way, too, when you set it correctly).
Stop-down metering is performed by pressing the "green button" on the hand-grip, just behind the shutter release. That closes the diaphram, meters, and sets the shutter speed according to the metering result. Which is nicer than most implementations of stop-down metering I've seen, where you have to manually stop down, read the metered result then set the shutter speed manually. This does all three things with the press of one button.
This can be done quickly and smoothly with the camera at eye-level if you use a kind of "claw grip" with your index finger on the green button and middle finger on the shutter release. Index finger to set exposure, middle finger to release shutter, one after the other. However, my experience is that the metering is
very protective against blown highlights - perhaps too much some times, leading to underexposure. When I have the time I've taken to checking the metered value and slowing the shutter by a half-to-full stop if that seems appropriate.
What did take me a while to get used to was manual focus. Not the process itself, as it turns out, but the level of care that has to be taken. My first attempt at firing off a few test frames on a walk at lunch-time left me with lots of shots where nothing in particular seemed to be in focus. I was using a 28mm lens and, I guess, thinking that reasonably close was probably good enough - and it just wasn't. I suspect that the APS-C size viewfinder, a focus screen optimised for autofocus and the less-forgiving-than-film nature of digital sensors.
With that disappointment under my belt, I practiced with the appropriate brick walls and focus check charts and suchlike to try to get a better feeling for things. I also suspected (but haven't yet verified) that the relatively wide aperture on my 50 (f1.4 vs f2.8) and higher magnification might help with focus, so I tried a few days later with better success:
With a little more practice (and learning to use the AF focusing aids as well as just eyeballing the focus screen) I thought I'd gained some consistency, so went for a walk in a nearby suburb where I thought there'd be some colour and movement:
(More from the set here:
http://www.flickr.com/photos/mfunnell/sets/72157629500914581/ )
All in all I'm pretty pleased, now that I've knocked some of the bugs out of my approach. The K200D is otherwise a nice little camera. It's small (by eye, roughly 2/3rds the size of my 5D in all dimensions), feels well-built, has weather seals, runs off AA batteries (easy to find in an emergency) and, I think a plus with old lenses, has in-body anti-shake. The camera itself wasn't expensive 2nd hand, and it provides a good digital platform for old Pentax manual-focus lenses which seem to be high quality yet plentiful and reasonably cheap.
It does make a nice digital platform for using some nice old Pentax lenses in digital/colour, to complement my use of the same lenses with B&W film.
...Mike