If anyone needs to use a small extension tube, note this: the Pentax K tube set is cheaper than the KA, and the smallest tube on the K set is smaller than the smallest tube on the KA set. The K tubes do not couple aperature, but my guess is this doesn't matter on a bellows.
-Lon [EMAIL PROTECTED] wrote: > > In practice, it all means that you would need a small extension tube (or set > of tubes) to use the Auto Bellows with the MZ-S. > > The Auto Bellows allows for a minimum extension of about 37mm. Another 8 mm > would make that 45 mm. They provide a maximum extension of about 163 mm, and > the additional 8 mm you would add are no problem here... just bring the > bellows in the extra 8 mm. > > The only remaining question is whether the MZ-S baseplate is big enough to > get caught on the bottom rail of the Auto Bellows. This would limit some of > the functionality of the bellows, which is different from working with a lens > and extension tubes. > > With a lens and extension tubes, you use your feet/body to move in and out, > back and forth while you focus until you have the image size (magnification), > framing, and focus you want. It is a two part process, because anytime you > turn the macro lens to focus it, you also change the magnification you are > getting. So you do a little dance until everything is just right. > > With the bellows, you use the back (camera end) adjustment to move the film > plane back and forth to focus. This doesn't change the magnification/image > size, it just brings it into focus. > > You still do some of the gross moves in/out, back and forth to rough things > out, but you set the image size and composition by fixing/finding the subject > to front lens distance. Once you have that established, you just dial in the > back end of the bellows until the focus is right. If you want to focus 1 mm > deeper into the object, you fine adjust the whole rail on the tripod (lens - > bellows - camera) by 1 mm closer to the subject. The image size > (magnification) and framing stay the same. > > There are probably some combinations of lens - extension - magnification > which are lost when you can't do 37 mm to 45 mm of bellows extension, but I > don't think they amount to much. Apologies for the long winded explanation. > > Regards, Bob S. > > [EMAIL PROTECTED] writes: > > > It means that your bellows is going to be 10 mm farther away the film plane > > than it would be without the tube. In other words the bellows will stop > > short by 10 mm at the closest distance to the film plane and go out 10 mm > > further than before. So unless you have, for some reason such as the size > of > > your subject, to work from a fixed position, it won't make any difference > at > > all. > > > > Don > <<snip>> > > ----- Original Message ----- > > From: "William Robb" <[EMAIL PROTECTED]> > <<<snip>>> > > > ----- Original Message ----- > > > From: Feroze Kistan > > > > > > > Hi William, > > > > Theres about 8mm btw the lents mount outer edge and the > > > > bottom edge of the protrusion- > > > > > > It looks like you need about 10mm of clearance to be able to > > > mount the bellows. > > > > > > > > How would the size of the image be affected by that combination? > > > > > > Not a clue, too many variables. > > > > > > William Robb
