Originally posted by ndevlin Modern leaf shutters are electronic. The mechanical ones in the A-series 645 lenses are ancient.
No kidding, which is why I mentioned the only two Japaneses manufacturers for them: Sekio or Copal. From what I have heard Copal are trying to get out of the shutter business*, what Seiko is doing: I haven't the faintest Idea. So it may be possible, however the question is: what lens should be equipped with a leaf shutter. Personally I would love to see something in the range of 105~150mm f/1.8~2.4 prime lens with a leaf shutter.
Originally posted by ndevlin the 25mm, which was cool (I am told sharp copies existed - a fact I'll take on faith, since both that i used were disappointing)
I have one of the older D-FA low serial numbered ones, It was probably one of the first to come to Australia. I tested it on my optics bench: it truly is
excellent especially when you compare it to lenses of similar focal length from the competition, like the Mamiya 645 28mm f/4.5 D ASPH - I just don't know what went wrong there**. However my principal gripe is that Pentax should have produced more of the 40.5mm filters for it, I'd think in their relationship with Hoya, they could have at least have come out with a variable ND*** with a range of (or set of individual) 1~10 stop ND and B&W contrast filters (which would appeal to the people who like me, are still using the excellent 645NII)
Originally posted by ndevlin IS is nice, but at almost any shutter speed where it matters, shutter vibration will also be a possible issue.
At close focusing distances the stabilized view through the lens is very useful when focusing when hand held. For me It prevents over tensing and fatigue from trying to hold the camera steady and it allows you to conserve your energy for when you finally press the shutter. I'm sure you would agree with me that hand held macrophotography can be just as physiologically taxing as hand held telephoto work.
*or was it
Compur that said that...
**Or did I get 4 bad copies of it? All I can say is that over the years Mamiya has
slipped, and they used to make excellent, though at times quirky Medium format cameras.
***Yes, I know, no-one has
ever made a colour neutral Variable ND filter.