Re: Need help with new lens -- getting conflicting views on lens to camera datatransmission
This design rarely has problem, so I am sure it should be fine. :) regards, Alan Chan Well, on the 25th, I'll be sure to try it out first thing, and report back. Hopefully it all works out! _ MSN 8 with e-mail virus protection service: 3 months FREE*. http://join.msn.com/?page=features/virus&xAPID=42&PS=47575&PI=7324&DI=7474&SU= http://www.hotmail.msn.com/cgi-bin/getmsg&HL=1216hotmailtaglines_eliminateviruses_3mf
Re: Need help with new lens -- getting conflicting views on lens to camera datatransmission
When the lens was set to 'A', the last contact on the lens mount would "pop
out" mechanically ('A' lenses only) and contact the camera mount. This will
close the circuit and the camera could be engaged in either program or
shutter priority exposure mode. It's just a simple mechanical design that
open and close the circuit.
regards,
Alan Chan
Umm...still lost. What does that one contact do? I wish I had that lens
out so I could see if everything was displayed on 'P' or 'Tv", all my test
shots with it were in Av...I should have known better. I don't like the QC
tolerance, on shaky ground they should be very attentive to quality control
at least.
_
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Re: Need help with new lens -- getting conflicting views on lens to camera datatransmission
It's just the way 'A' lenses were designed. When the lens was set to 'A', the circuit will be closed and the camera will determine the maximum and minimum aperture based on the arrangement of the contacts on the lens mount. F & FA lenses have chips inside to tell the camera what apertures they are so they work even when the lens was set to other than 'A'. But then again, even with F or FA lenses, the displayed aperture might not be accurate (could be 1/2 stop off when the lens was set to non-A). It has to do with the QC tolerance. regards, Alan Chan Yes, that works (Program Mode), but it's just a mechanism on the camera and on the lens, to close down the aperture for a shot. This lens has one contact. I don't know what it does. But it will not display the f-stop in the viewfinder or LCD screen while in Av or Tv mode. I looked at the negs (data imprinting does come in handy!!), and in program it tells you, but in Tv or Av it does not. Just an F--. I talked to another member off-list who has this lens, and has used it with the MZ-S and the PZ-1p, and they get the same result. So, it works, but doesn't display the information I would have thought, and others thought, it should. It doesn't cripple the lens or camera, but it's nice to see that information. _ Tired of spam? Get advanced junk mail protection with MSN 8. http://join.msn.com/?page=features/junkmail
Re: Need help with new lens -- getting conflicting views on lens to camera datatransmission
Variable-aperture zooms have fixed contact patterns, and can therefore only indicate a fixed aperture range. In this case, the incorrect f-stop may be displayed in the viewfinder, and I guess that because of this, Pentax left the feature completely out. Note that due to the TTL exposure metering, the film will be exposed properly regardless of the fact that the f-stop's numerical value may be calculated incorrectly." I think this is one thing the Nikon system works better. When the lens was zoomed, or macro lens focuses to very close distance, the aperture readout would be compensated automatically. Pentax AF system doesn't do that. regards, Alan Chan _ Protect your PC - get McAfee.com VirusScan Online http://clinic.mcafee.com/clinic/ibuy/campaign.asp?cid=3963
