Originally posted by Paleo Pete I don't have any M42's, all mine are K mounts, but I can't wait to snap on the 135mm and see how it does.
While you wait, check out the various "club" threads in the Lens forum for sample images taken with various different lenses. There's a 135mm club, an "M" club for the M-series lenses, a K-club for the pre-"M" "Pentax SMC" lenses, an "A" club for the "A" series, etc.
Quote: Not sure how the 2x converter will do
In general, probably not as well as simply cropping in PP. This may have been enough of a pain with film to make the TC seem like a more viable solution, but with digital, it's usually the other way around. Some specific lens / TC combos will indeed perform better than simply cropping (assuming the loss of a stop or two of light isn't a deal-breaker right there), but don't count on it.
Quote: I'm the same, I always try to keep the ISO low as possible, I guess it's too ingrained after 20 years of 35mm...
It's still very good advice. it's just that the specific numbers may have changed. You *can* safely use ISO 1600 and expect results as good as ISO 400. that's mostly a great thing, as it potentially allows you to shoot two stops faster shutter speed for a given aperture, or two stops smaller aperture for a given shutter speed. Meaning you can get better shots in lower light than you would have with film on the same lens - assuming, of course, you're OK with the change in field of view due to so-called "crop factor".
Actually, though, in many cases (eg, telephoto) it's even cooler than that, because if you want to get a similar FOV, you would use a shorter lens, and chances are that shorter lens is maybe half a stop faster if it comes from the same basic lens line. Like the M135/3.5 versus M200/4, M100/2.8 versus M135/3.5, or M85/2 versus M100/2.8, or M50/1.7 versus M85/2. Of course that breaks down as you get to the wider angles. But it does mean that whatever shutter speed you might have managed with an M135/3.5 at f/3.5 and ISO 400 with film, you'll get an incredible *six times faster* shutter speed by instead shooting a M100/2.8 at ISO 1600 with digital, and the image will be essentially the same in FOV, DOF, and overall IQ (eg, grain/noise). Those of us who do a lot of short-medium telephoto shooting just love this sort of effect. But if you're more of a wide angle person, the "crop factor" will of course be a big downer, but you'll still benefit from the fact that ISO 1600 is as usable as ISO 400 was with film, which at least *partially* makes up for it.
Quote: I'm basically a purist, so I avoid most changes in camera settings, and until I study th manual quite a bit more and find out what they are and what they do, I won't be experimenting.
Just as well, IMHO. Whether shooting digital or film, the only things that really matter are ISO, aperture, and shutter speed. I basically never mess with anything else. Well, WB (which is like changing from daylight to tungsten film), but I prefer to shoot RAW and adjust WB if necessary in PP. AWB does a decent enough job in all settings except tungsten lighting.