>>The IS-3 has a sensor in the bottom of the mirror box similar to our OM's.
>>I looked through every page of documentation and didn't read anything about
>>this sensor or OTF metering of any kind. What is it, and what does it do?
>>
>I do not know about the IS-3, but you will encounter this in virtually all
>modern AF SLRs. Metering off the viewing screen is getting rare. Most modern
>SLRs use a mirror that passes part of the light through the main mirror off
>a second mirror to AF and/or metering sensors in the floor of the mirror
>box. The OM-2S and OM-4 use this system. Very few meter OTF except for TTL
>flash. Some older MF SLRs have a sensor in the side of the mirror box that
>is usually for TTL flash OTF. From what I know, you just about have enough
>fingers on one hand to count the cameras that measure ambient exposure OTF,
>and most are Olympus. The Pentax LX is one example from the other
>manufacturers. The Minolta X-700 has a unique system that takes a second
>reading after the diaphragm closes and adjusts the exposure to compensate.
>It is not OTF, but closer than the usual system to actual taking conditions.
Light entering the viewfinder DOES effect metering.
Ken Norton
############################################################
| This message was delivered via the Olympus Mailing List
| To receive the Digest version mailto:listserv@xxxxxxxxxxxxxxx
| with "subscribe olympus-digest" in the message body.
| To unsubscribe from the current list mailto:listserv@xxxxxxxxxxxxxxx
| with "unsubscribe olympus" in the body.
| For questions mailto:owner-olympus@xxxxxxxxxxxxxxx
| Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html
############################################################
|