[LRflex] Re: Using R lenses on digital bodies...
- From: Steve Barbour <steve.barbour@xxxxxxxxx>
- To: leicareflex@xxxxxxxxxxxxx
- Date: Sat, 6 Feb 2010 09:16:24 -0800
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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