No one ever answered my question - what is the default
Status of the aperture on a canon FD lens when not
Mounted on a camera? ( Stopped down like PK, or wide
Open like M42?)

As far as the registration change, I do not know
For sure why it was done, there may have be
Technical advantages to do so and the FD lenses
May not have been compatible for other reasons
Already in the EOS mount so that the registration change
a was moot issue.
JCO

-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of
William Robb
Sent: Thursday, October 19, 2006 10:01 AM
To: Pentax-Discuss Mail List
Subject: Re: The JCO survey


----- Original Message ----- 
From: "Kostas Kavoussanakis"
Subject: Re: The JCO survey


> On Wed, 18 Oct 2006, William Robb wrote:
>
>> Truthfully, it's like asking Pentax to put an aperture cam follower 
>> onto
>> a DSLR. The big difference between Canon and Pentax regarding this is
>> that it's recent history with Pentax.
>
> I cannot see how an aperture cam removal is the same as a register
> change. To me that's the major difference, not how recently it
> happened. We have discussed economics, so let's not go into the the $5
> times 35 gazilion years argument.

They are both changes to the mount, done for purely economic reasons.
Had Canon so desired, they could have left the register distance alone, 
and it should have allowed adapting FD lenses to EOS cameras, though the

lenses themselves may have needed modification.
It's a pretty simple concept to get ones head around.

William Robb





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