Re: Some technical questions (may be silly)

2003-05-31 Thread Rfsindg 
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)

2003-05-31 Thread Alan Chan 
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
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RE: Some technical questions (may be silly)

2003-05-31 Thread tom 
> -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)

2003-05-31 Thread Caveman 
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