And John, Did you clean the contacts on the camera as well? Regards, Bob S.
On Mon, Jul 15, 2013 at 12:40 PM, John <[email protected]> wrote: > On 7/15/2013 1:03 PM, Zos Xavius wrote: >> >> Did you try cleaning the contacts? There isn't an communication >> between the lens and the camera for an A lens. It just reads the >> contacts and determines aperture range. Try cleaning them. >> > > Yup. That was something I learned from Army radios. > > Don't know why it stopped working. Don't know why it started working > again once I got home. Don't know when it's going to decide to crap out > again. > > But the contacts are clean. > > I (gently) racked the aperture ring several times from 'A' to 2.8 & back > again to see if maybe some bit of grunge was keeping it from registering > the 'A' position internally. > > I guess it's time to start looking for a backup/replacement before it > fails for good. Looks like the only thing available is going to be > either the 28-70 F2.8 SIGMA EX ASPHERICAL (77) or the 24-70 F2.8 SIGMA > DG EX ASPHERICAL (82). > > Anyone have hands on experience comparing either of them with the Tokina > ATX-Pro? > > > >> On Mon, Jul 15, 2013 at 12:59 PM, John <[email protected]> wrote: >>> >>> I finally dredge up enough motivation to actually go out and do some >>> photography. Got on site & my favorite lens takes a crap on me. >>> >>> My workhorse has been a Tokina ATX-Pro 287 28-70mmf/2.8. I got two frames >>> & >>> camera won't fire the shutter. Aperture shows "F--". I do everything I >>> can >>> to make sure the lens is properly seated & that the aperture ring is >>> latched >>> into the 'A' position ... NO JOY! Nothing I can do will make it show the >>> aperture. >>> >>> I have one other 'A' lens (SMC Pentax-A Macro 1:2.8 100mm) in my bag on >>> site, & when I switch to it the aperture works fine. I also try both >>> lenses >>> on my K10D (backup) and get the same results; Tokina "F--" & Pentax shows >>> the aperture selected with the thumb-wheel. >>> >>> I'm back home & I've got a couple of other Pentax auto-focus 'A' lenses >>> to >>> test with. They all show the aperture & change with the thumb-wheel. And >>> just to add insult to injury, I give the Tokina one last try & now it's >>> showing the aperture again. >>> >>> Meanwhile, every bit of motivation has drained away! > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and > follow the directions. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
