[Leica] M8 trials and tribulations?

[hoppyman at bigpond.net.au (G Hopkinson)]

Hi Gene, yes I understand. I think the sensor measures light to compare to 
the ttl measurement so the camera calculates the
difference to estimate the aperture for flash exposures. Anyhoo I don't have 
one. Usually I resist M8 thread!
On the Nikon I was just mentioning the old optical reading system as an 
example that it is possible to obtain an aperture reading
with no mechanical nor electrical connection. That D200 system does look to 
be very clever on that modern Nikon.

Cheers
Hoppy

-----Original Message-----
Subject: RE: [Leica] M8 trials and tribulations?

Hoppy,

the cell on the m8 is for flash exposure not aperture calculation.  the 
nikon aperture window works because the aperture ring is
right under the pentaprism, where the aperture ring on m lenses is way out 
on the front of the lens and the window would not work
here.  on the d200 if you have a ais lens you will have aperture info, if 
you program the menue for it.  for other lenses it can
only tell you how far stopped down you are from wide open, not the actual 
aperture is.

gene

-------------- Original message from "G Hopkinson" 
<hoppyman@bigpond.net.au>: -------------- 


> Jerry, it is true that there is no mechanical nor electrical connection 
> with the 
> lens to display the aperture. I think 
> understandable and ingenious that this digital remains compatible with 
> almost 
> all M lenses. However the camera does have the sensor 
> on the top plate which assists with estimating the aperture for flash 
> work. I 
> believe that its readout is considered insufficiently 
> reliable for its information to be included in the EXIF. Do you recall the 
> system that Nikon had on its manual focus cameras with 
> the small window that actually showed a view of a smaller copy of the 
> aperture 
> scale, printed on the rear edge of the lens? So I 
> guess it can be done if thought important enough. 
> 
> Cheers 
> Hoppy 
> 
> -----Original Message----- 
> 
> Subject: Re: [Leica] M8 trials and tribulations? 
> 
> Frank, 
> 
> If you think you are so smart, can you suggest any POSSIBLE way that the 
> EXIF file could even 
> detect what aperture is used on each photo? Shutter speed , of course. 
> Aperture? NFW! There 
> is no connection 'tween the lens and the M8 body except the RF cam and 
> the fixed bar code. 
> 
> Jerry