[LRflex] Re: Using R lenses on digital bodies...- programmed chip
- From: "Aram Langhans" <leica_r8@xxxxxxxxxxx>
- To: <leicareflex@xxxxxxxxxxxxx>
- Date: Mon, 8 Feb 2010 07:43:02 -0800
Hi Herman.
As far as I can see, this is the instructions to program the chip for a
particular lens and will not do anything to correct the exposure problem
while actually using that lens.
Related, has anyone tried to program their particular chip to the actual max
aperture of their lens? If I try that, I get an incorrect exposure wide
open. Example. I have the 180/4, so I programmed my adapter as such. But
when I put the lens on the camera, and shoot wide open at f-4, my pictures
are very overexposed. I reprogrammed the adapter for f-2 - the Canon
default, and when I shoot wide open at f-4 the pictures are properly
exposed.
No matter what lens I use, I must have the adapter set to f-2.0 for the
exposure to work. I have 3 different chipped adapters from three different
companies and they all work at f-2.0 no matter what lens is attached.
Strange????
Aram
--------------------------------------------------
From: "Herman Kempers" <info@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
Sent: Sunday, February 07, 2010 10:43 PM
To: <leicareflex@xxxxxxxxxxxxx>
Subject: [LRflex] Re: Using R lenses on digital bodies...
>
> Hi Steve,
>
>
> Mayby this can help, but not sure it works with an adapter from a
> different brand. I have no expierence with this way of working......
>
>
>
> http://www.optixpcb.com/
>
>
>
> and Richard; I agree with all your points, but there was a question. I
> only answered that it was because the lack of EXIF.
>
> (when it's getting dark, it's probally sunset. If you want to keep on
> reading, turn on the lights...)
>
>
>
> best to all
>
> herman
>
>
>
> On Feb 7, 2010, at 1:15 AM, Herman Kempers wrote:
>
>> Hi Steve,
>> Yes, that is a problem. Because there is no EXIF information from a R
>> lens (ROM isn't working) to the 5d, the body doesn't know what lens is
>> used and goes to a standard setting of 1.8 (if I'm correct...) With lens
>> open the exposure is -almost- correct in most cases, but stopping down
>> makes the exposure value changing to much for correct metering.
>>
>> (the problem with todays camera's; they think to much.....but don't know
>> everything)
>>
>> I have read a way to set a compensation in the camera, but have to find
>> it back on the inernet.
>
>
> please let me know...
>
> thanks,
>
> Steve
>>
>> Give me some time.
>>
>> Herman
>>
>> -----Oorspronkelijk bericht-----
>> Van: Steve Barbour <steve.barbour@xxxxxxxxx>
>> Verzonden: za 06-02-2010 17:28
>> Aan: LRF reflex <leicareflex@xxxxxxxxxxxxx>;
>> Onderwerp: [LRflex] Using R lenses on digital bodies...
>>
>> 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------
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- » [LRflex] Re: Using R lenses on digital bodies...- programmed chip - Aram Langhans
