I wondered if the single ring for focus and focal length along with vari-focus might be the problem. But were that the case one would expect that some missed focuses would be in front of the subject, some behind.
These were all behind. And yes, all low light, wide open, but consistently behind. Could just be a coincidence. I'll have to test under controlled conditions... Cheers, frank On December 13, 2015 2:26:56 PM EST, "P.J. Alling" <[email protected]> wrote: >One of the problems I have with the Varifocal lens is in fast moving >situations there's just too much to do, what with keeping track of >changing light situations, and having to hit the green button, then >refocusing every time there is even a minor change in focal length, a >tiny change can really change the focus point, and the stock focusing >screen isn't a big help there, as it's very forgiving of missed focus, >(you can be quite a bit off in focus and it still looks good in the >viewfinder). > >Dim lighting situations can really get you out of the meter's effective > >EV range, using stop down metering too, which leads to very under >exposed images as well. > >The lens itself is pretty damned sharp at most focal lengths and >apertures, if you get the focus right but it is softer wide open than >stopped down a stop or two, pretty traditional really. > >The biggest problem I find is both my copies are much softer wide open >at both 35mm and 85mm at close focusing distances, and that really >starts to show at K20D and above sensor resolutions. > >On 12/13/2015 11:35 AM, knarf wrote: >> I used to have the hood! >> >> It friction - fit on the filter ring and was secured by a small >knurled screw. Not the most secure system, I lost the hood one day in a >crowd. >> >> Yesterday's foray with the lens was a huge disappointment. It kept >focusing several feet behind the subject. I don't know how that could >happen as I have no problem focusing with my M 200mm and Tamron 90mm >macro, both of which I use often. If it's focused on the focusing >screen why wouldn't it actually be in focus? If the focusing screen is >somehow askew shouldn't all my manual focus lenses suffer similarly? >> >> I don't get it... >> >> Cheers, >> >> frank >> >> On December 12, 2015 6:37:10 PM EST, "P.J. Alling" ><[email protected]> wrote: >>> One other note, the most useful accessory for this lens is the hood >>> originally meant for the S1 90-180mm Flat Field Zoom. >>> >>> On 12/12/2015 12:51 PM, knarf wrote: >>>> Going for image quality over speed and stealth today: >>>> >>>> http://knarfinthecity.blogspot.ca/2015/12/old-skool.html?m=1 >>>> >>>> Could be thought of as OT because it wasn't taken with a Pentax >>> product but obviously Pentax content, so I'm opting for "not OT". >>>> That is one unbelievably heavy lens. I guess a real and actual >metal >>> barrel will do that. >>>> Enjoy! >>>> >>>> Cheers, >>>> >>>> frank -- "Sharpness is a bourgeois concept." -- Henri Cartier-Bresson Sent from my Android device with K-9 Mail. Please excuse my brevity. -- 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.
