Re: Some technical questions (may be silly)
This lens doesn't automatically stop down when you take the picture. Put a normal f2 lens on your camera, turn it to f8 and you still have a bright viewfinder, but the lens will stop down to f8 when you take the picture. Put the K28/3.5 shift lens on the camera. Turn the shift lens to f8 to get a better depth of field and the viewfinder will grow dark. So you will have to focus at f3.5 and then pre-set your aperture to f8 before you fire the shot. (I have a series of old Asahi Pentax screwmount lenses that work just like this. It is how 35mm cameras worked before we had auto-aperture lenses.) Regards, Bob S. [EMAIL PROTECTED] writes: > 6) the preset diaphragm in K 28/3,5 Shift - what does it mean? how does it work?
Re: Some technical questions (may be silly)
5) the AF/MF clutch in the SMC FA* 24/2 AL (IF) - I held this lens once and didn't notice any AF/MF switch (I might have missed it of course) so where's that clutch and what is it supposed to do? Just pull the focus ring. :-) regards, Alan Chan _ Protect your PC - get McAfee.com VirusScan Online http://clinic.mcafee.com/clinic/ibuy/campaign.asp?cid=3963
RE: Some technical questions (may be silly)
> -Original Message- > From: Artur Ledóchowski [mailto:[EMAIL PROTECTED] > > > 5) the AF/MF clutch in the SMC FA* 24/2 AL (IF) - I held > this lens once and > didn't notice any AF/MF switch (I might have missed it of > course) so where's > that clutch and what is it supposed to do? The clutch is the focus ring. It slides forwards and backwards with a sort of snapping action. The FA 85/1.4 has the same thing. I sent it off to Mike J for a few weeks so he could play with it, and he couldn't figure it out either, so don't feel too bad. tv
Re: Some technical questions (may be silly)
Artur Ledóchowski wrote: 4) floating elements - the feature that appears several times with certain lenses. It's those elements that you can hear and feel rattling inside when you shake an AF lens ;-) Now seriously. It's a "feature" used to focus a lens by moving an internal optical group instead of extending forward the whole lens optical assembly. cheers, caveman
Some technical questions (may be silly)
Hi, I've been recently reading the KMP for the who-knows-what time... but this time paying special attention to some details. There are several things I don't fully understand and so I need a bit of enlightement (I wasn't able to find the answers on the KMP). 1) the dental close-up lens and dental macro lens - you don't try to tell me they are supposed to take photos of one's teeth, do you? what is so special about them, that makes the name "dental" necessary? aren't they just ordinary close-up lenses and macro lenses? 2) "auto bellows (identical with auto bellows M and auto bellows A)" - is "auto bellows" a common name for "auto bellows M" and "auto bellows A" or rather the 3rd kind of the bellows - more like, say, "auto bellows K" (just like the lens series).? Does the auto bellows A support the A-series lenses' features, like KA-bayonet and "A" position on an aperture ring? 3) bellows unit III, macro focus rail III, copy stand III (and IIIp) - what does the "III" mean? Is it somethink like, say, Mk. III or something? 4) floating elements - the feature that appears several times with certain lenses. It has something to do with improving lens' performance at close distances but what exactly is it? 5) the AF/MF clutch in the SMC FA* 24/2 AL (IF) - I held this lens once and didn't notice any AF/MF switch (I might have missed it of course) so where's that clutch and what is it supposed to do? 6) the preset diaphragm in K 28/3,5 Shift - what does it mean? how does it work? I'll be more than happy if some of You can provide the assistance... TIA Regards Artur
