There may have been advantages beyond lens sales to changing the
register distance. When using long lenses on SLRs with "normal" length
mirrors, you'll see some image cutoff at the top of the focusing screen,
a relatively simple fix is to use a longer mirror, a lot of companies,
including Pentax made a big deal about that. It usually showed up in
their professional offerings. Maybe Canon was able to simplify the
mirror mechanism and still accommodate the longer mirror by using a
longer register distance. Some systems seemed quite complicated to
accomplish the same thing. Things like this are easy when you're
starting with a clean slate.
Kostas Kavoussanakis wrote:
>On Thu, 19 Oct 2006, William Robb wrote:
>
>
>
>>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.
>>
>>
>
>Thanks, I had assumed that there was an advantage to the user from the
>register-distance change that Canon introduced.
>
>Kostas
>
>
>
--
Things should be made as simple as possible -- but no simpler.
--Albert Einstein
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