This was what I suggested, wasn't it - slow aperture syndrom? Don't clean the blades. Just exersise the aperture mechanism with your fingers before use (that is if there's no oil etc. on the blades). 100 times usually does it - for a while, anyway :-)
Jens Bladt mailto:[EMAIL PROTECTED] http://hjem.get2net.dk/bladt -----Oprindelig meddelelse----- Fra: Peter Smekal [mailto:[EMAIL PROTECTED] Sendt: 29. marts 2005 16:54 Til: pentax-discuss@pdml.net Emne: RE: RE *istD overexposure with manual lenses Yes, you'r probably on the right track. Its getting gradually worse with smaller apertures. Mmm... I've never cleaned lens blades ... sounds tricky. The question is how much Pentax would take for that kind of job. Peter >Peter, I just checked this and the aperture gets a lot >more time to respond when the green button is pushed >than during actual exposure. >I'd bet on a sluggish aperture. >Is it worse at smaller apertures? >That would be a sure sign. > >Don > >> -----Original Message----- >> From: Peter Smekal [mailto:[EMAIL PROTECTED] >> Sent: Tuesday, March 29, 2005 8:35 AM >> To: pentax-discuss@pdml.net >> Subject: Re: RE *istD overexposure with manual lenses >> >> >> Jens, >> >> its only two of the lenses that behave that way (M28 and M50/1.4). The >> other work just fine. >> >> Peter >> >> Nope! >> >All my old lenses work just fine (A20, A28, M35, M1.7/50, K105, K135, >> >M4/200, M*300) - even my two Tamron Adaptall lenses work fine). >> >A possible explanation could be that old Pentax "slow aperture syndrom" - >> >the lenses stop down to slowly - if the have not been used for a >> long tim or >> >been sitting on a camera. But I guess it would be impossible for ALL of >> >them to act this way?? >> >You must have a firmware problem! >> >Jens >> > >> > >> >Jens Bladt >> >mailto:[EMAIL PROTECTED] >> >http://hjem.get2net.dk/bladt >> > >> > >> >-----Oprindelig meddelelse----- >> >Fra: Peter Smekal [mailto:[EMAIL PROTECTED] >> >Sendt: 29. marts 2005 14:27 >> >Til: pentax-discuss@pdml.net >> >Emne: *istD overexposure with manual lenses >> > >> > >> >Hi folks, >> >I was trying out some of my K and M lenses on the *istD: 24/2.8, M28/2.8, >> >35/2.8, M50/1.4, M85/2. I was really looking forward to use some of these >> >old pearls. The strange thing is that I get very overexposed >> pictures with >> >the M50/1.4 and the M28/2.8. I am using the M mode + the green button. >> >Firmware is updated. Any explanation? >> >Peter >> >> >>
