[LRflex] Re: Using R lenses on digital bodies...

On Feb 6, 2010, at 8:43 AM, David Young wrote:

> At 2/6/2010, you wrote:
>> There has been  lot of discussion about this topic here. I am 
>> currently using Leitax conversion of R lenses to enable their use on 
>> my Nikon D700. I've been very happy with this solution.
>> 
>> A friend asked about use of R glass on the Canon 5D, with an 
>> adapter, so that he can use the lenses on a ff digital body and also 
>> readily use them on an R8 film body...
>> 
>> My recollection is that works fine if the lens aperture is wide 
>> open, but as you decrease the aperture the in camera light meter 
>> progressively over-exposes the image.
>> 
>> I wonder if someone is using this approach and/or recalls the 
>> details. Is there a way to avoid or correct for this?  Do the more 
>> recent Canon digital bodies avoid this over exposure problem... ?
>> 
>> Do you know if there is a software fix for this metering problem?
>> 
>> I'd be very interested in your input to understand, avoid, resolve 
>> this issue...
>> 
>> many thanks,
>> 
>> Steve------
> 
> Good Morning, Steve!
> 
> If Canon lenses were left to their own devices, they too would 
> overexpose when stopped down.  It has something to do with the 
> metering circuit and Canon opted to go with a software solution, when 
> the EOS system was devised. It was, at that time, the lowest cost 
> solution,and, of course, works perfectly with EOS lenses.
> 
> However, when you adapt other lenses via adapters, the problem 
> appears.   Because is no mechanical link from the "other brand" lens 
> to the "chips" which can be added to the adapters, it is not possible 
> to get around the problem.    When shooting at max or near max 
> aperture, the problem is not significant, but becomes more so, as you 
> stop down.  To  my knowledge, there is no hardware or software fix to 
> this problem.
> 
> Other cameras to which our glass can be adapted do not seem to 
> display this problem.
> 
> This is one of the reasons I switched from Canon to Olympus for my R 
> glass.  (There were others.)

thanks,


what were the other reasons too please?

Steve
> 
> Aram may be able to fill in more info.
> 
> Cheers!
> ---
> David Young
> Logan Lake, Canada.
> 
> Wildlife Photos: www.furnfeather.net
> Personal Website: www.main.furnfeather.net
> A micro-finance lender though http://www.kiva.org
> 
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