Does the *ist DS have a body-mounted aperture control that works with A or K lenses!!!????? Jens
Jens Bladt mailto:[EMAIL PROTECTED] http://hjem.get2net.dk/bladt -----Oprindelig meddelelse----- Fra: John Francis [mailto:[EMAIL PROTECTED] Sendt: 16. november 2004 22:32 Til: [EMAIL PROTECTED] Emne: Re: Using pre-A lenses on *istDS (was:*ist-DS english manual) Jens Bladt mused: > > The *ist D does NOT measure light with open apeture (It can, though). I > stops down when the green button is pressed (if Firmware 1.1 is installed) > and meter the light at working aperure - and if "F stop other than A" is > "ON". *AND*, most importantly, the camera is in manual mode. If it's in Av mode, with an old lens mounted, it will meter with the lens wide open (just as it does with an A-or-later lens mounted and set to the A position). Then when you come to make the exposure it will leave the aperture wide open while the shutter operates (although it will then briefly stop the lens down *after* the exposure - weird!) > Most modern camears measure with open aperture, calculating the right > exposure when releassed. I believe this is done bey the aperture simulator, > invented by Topcon many years ago (late sixties perhaps) and later copied > by most other manufactureres - like Pentax and others. But which is only necessary if the camera doesn't already know the aperture. With a body-mounted aperture control no additional coupling is needed. > Older cameras - like the Pentax Spotmatic series, had to be stoped down in > order to measure the light, just like the *ist D with a K or M lens mounted. > It's kind of sad to see, that Pentax took such a huge step backwards, IMO. I dn't think we really need to rehash this one again.
