[Leica] R glass on Nikon question

[cummer at netvigator.com (H&ECummer)]

Hi Aram,
In my personal experience with Nikon D200, D300 and now D700 cameras, you 
mount the R lens re-bayoneted for Nikon (thank you David Lladro of Leitax) 
set the camera to Aperture Preferred,
and as you close down the aperture, the shutter speed adjusts - in a linear 
fashion (not like the Canon) and you get correct exposures. The D7000 has 
the same ability to use old Nikon lenses as both the D300 and the D700 - 
please see:
http://www.dpreview.com/reviews/nikond7000/page2.asp
and so should work with re-bayoneted lenses in the same way as its bigger 
brothers. There is no need for a communication between the R lens and the 
camera body.
The D7000 and other higher level Nikon digital SLRs can be set for up to 9 
non CPU lenses - focal length and maximum f stop - this is useful for EXIF 
data - and can be easily accessed by assigning the function button (on the 
lower right front of the camera) to non cpu lens data. It is just a push of 
the button and a twist of the rear dial to set for each lens - and if you 
forget to do it - there is no effect on the picture recording.
For details on setting this up please contact me off list.
Perhaps the D90 was set to not fire the shutter when no lens was attached 
and that would explain why it locked up??
Best Regards
Howard
> Date: Mon, 6 Dec 2010 10:37:27 -0800
> From: "Aram Langhans" <leicar at q.com>
> Subject: [Leica] R glass on Nikon question - hopefully the last one.
> To: <lug at leica-users.org>
> 
> Query for those Nikon/Leica shooters.  I converted one lens to Nikon mount 
> for experimenting with.  Finally got a chance to go to Seattle and try it 
> on 
> a Nikon camera as a prerequisite for my getting the D7000.   The best they 
> had on the shelf for demo was a D90, so I gave it a try.  Mounted the 
> lens, 
> checked the infinity focus and it was fine.  Selected A mode and tried to 
> shoot and it would not shoot.  Went to the clerk and he said because there 
> was no communications between the lens and camera it did not know what 
> f-stop it was.  We spun the f-stop wheel and it did not change anything.  
> On 
> my Canon, it just picks an f-stop if you don't have a chip, and you can 
> shoot.  I always choose f-2.0, as that works well.
> 
> I put the D90 it in M mode and still no f-stop, but it would fire.  But it 
> would not show any exposure readings in the viewfinder so I had no idea 
> what 
> the correct exposure was.  I experimented a bit till I got the correct 
> exposure for f-2.0, then worked my way through the f-stops and shutter 
> speeds manually checking for any exposure problems ala Canon.   Spot on. 
> That problem is solved over Canon.
> 
> So, my question to those who use R glass on Nikon, how do you deal with 
> this 
> problem of no f-stop communication?  The clerk said the D7000 and above 
> has 
> a way of setting the f-stop in the menus, but I am wondering if I need to 
> do 
> this for each lens?  Every time I change lenses?  That would be an even 
> bigger hassle than the Canon exposure problem.  How do you do it?
> 
> Aram
> 
>