Archived posting to the Leica Users Group, 2004/01/25

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Subject: Re: [Leica] Re: R lenses on Canon bodies
From: John Collier <jbcollier@shaw.ca>
Date: Sun, 25 Jan 2004 22:06:49 -0700
References: <97E8708C-4F88-11D8-8352-000393778554@netvigator.com> <0C600344-4F91-11D8-AEC2-000A958F513A@jphotog.com> <3C2F0096-4FA4-11D8-B824-0050E42E6E0B@shaw.ca> <26F7F6EE-4FAF-11D8-AEC2-000A958F513A@jphotog.com> <28D55016-4FB3-11D8-BB05-0050E42E6E0B@shaw.ca> <E835B60A-4FB8-11D8-AEC2-000A958F513A@jphotog.com>

The sensor is of course getting light from the lens in all the cameras 
but it's the fact that the camera's electronics are not getting any 
electronic data from the lens which may be causing the problem. There 
are no mechanical connections on EOS lenses. As I said before, some EOS 
cameras are designed with software work arounds if there is no 
electronic data from the lens other EOS cameras are not.

John Collier

On Jan 25, 2004, at 9:34 PM, Eric Welch wrote:

> Well, in that case, I'd still say it has nothing to do with the 
> difference between cameras, since the lens is going to cover all of 
> the sensors in question just fine - because they're identical 
> physically. It's rare that there is absolutely no data reaching the 
> sensor. And I have yet to detect a significant difference between the 
> EOS D60 and D300. Though I haven't shot gemstones fluorescing under 
> longwave UV and shortwave UV light yet. I haven't done any extremely 
> long exposures with it either (15+ seconds). I guess now I'll have to 
> do just that.
>
> Eric Welch
> Carlsbad, CA
> http://www.jphotog.com
>
> "To be is to do"--Socrates.
> "To do is to be"--Jean-Paul Sartre.
> "Do be do be do"--Frank Sinatra.
>
> - By Kurt Vonnegut, Jr
> On Jan 25, 2004, at 7:53 PM, John Collier wrote:
>
>> It is not quite as simple as that. Some EOS cameras do not like 
>> getting absolutely no data from the lens while other EOS cameras 
>> don't mind at all and have software work arounds programmed in. It 
>> all depends on the software feature set of the camera not the 
>> potential capabilities of the sensor.
>
> --
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>

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Replies: Reply from Eric Welch <eric@jphotog.com> (Re: [Leica] Re: R lenses on Canon bodies)
In reply to: Message from Howard Cummer <cummer@netvigator.com> ([Leica] Re: R lenses on Canon bodies)
Message from Eric Welch <eric@jphotog.com> (Re: [Leica] Re: R lenses on Canon bodies)
Message from John Collier <jbcollier@shaw.ca> (Re: [Leica] Re: R lenses on Canon bodies)
Message from Eric Welch <eric@jphotog.com> (Re: [Leica] Re: R lenses on Canon bodies)
Message from John Collier <jbcollier@shaw.ca> (Re: [Leica] Re: R lenses on Canon bodies)
Message from Eric Welch <eric@jphotog.com> (Re: [Leica] Re: R lenses on Canon bodies)