Search results for 'back focus' - page 1220
SDM Problem with DA* 50-135mm
Yes, my old 16-50 was notorious for this. My method was to have AF on, half press the shutter and manually turn the focus ring (quick-shift) to and from the extremes a few times. Lens would eventually wake up. It went on for years like this and never failed entirely.
Posted by pschlute on 14/09/2021 - 20:56
SDM Problem with DA* 50-135mm
Yes, as above, rotate the focus ring through the whole range with the AF button pressed and the lens cap on. Option 2 is to convert to screwdrive. Option 3 is to remove the mount and rotate the motor manually with a screwdriver. This might have the effect of loosening the grease in the unit (t...
Posted by HarisF1 on 14/09/2021 - 23:20
SDM Problem with DA* 50-135mm
It's not terminal as both my 50-135mm and 16-50mm have done the same thing for years. I have found (on the K-1 at least) that they wake up a lot quicker if you use liveview first. Alternative is to change them over to screw drive with a hack available on Pentaxforums. Yes, my old 16-50 was notori...
Posted by malfis on 15/09/2021 - 17:17
SDM Problem with DA* 50-135mm
It's not terminal as both my 50-135mm and 16-50mm have done the same thing for years. I have found (on the K-1 at least) that they wake up a lot quicker if you use liveview first. Alternative is to change them over to screw drive with a hack available on Pentaxforums. Yes, my old 16-50 was notori...
Posted by Mike-P on 15/09/2021 - 19:25
Tair-3 300mm f4.5 GRAND PRIX Brussels 1958
I owned one of these strange lenses many years ago and never really got on with it, but with more experience and a different expectation I now know to use lenses for their character rather than just looking for ultimate sharpness. The copy I picked up yesterday was under £50 so I thought I'd give...
Posted by LennyBloke on 16/09/2021 - 13:56
Pentax HD DA 16-85mm F3.5-5.6 ED DC WR Lens
Well, with your encouragement and accepting my LBA has come back, I have just splashed out £570 on this lens. My most expensive photographic purchase EVER!! Just been for a quick wander outside. Takes nice pix ;-) Yew berries Nasturshnam Hollyhock
Posted by GrumpyGrandPa on 16/09/2021 - 14:33
Damaged Lens
My all-round zoom lens DA 16-85mm ED DC WR is damaged. My KP fell off the tripod's quick release and now it won't focus properly. It only goes down to 35mm manually and doesn't work with auto ficus. My local dealer daid it was a broken zoom hood. Contacted John Pye and they said they would have to s...
Posted by rodcy on 28/09/2021 - 19:50
Tamron 17-50mm f2.8 lens- replace or fix?
Hi, I have a Tamron 17-50 f2.8 lens which I use for weddings. Or used up until this issue For a while it's acting strange- doesn't focus. I sometimes have to focus (tends to focus better at shorter lengths) and then zoom in, which it's ideal and maybe bad for focus. It's not an expensive lens s...
Posted by dinneenp on 11/10/2021 - 16:58
Tamron 17-50mm f2.8 lens- replace or fix?
First or all - have you tried giving the contacts a good clean on both lens and camera? The only way to know if it's worth foxing or not is to get a quote. I'm not sure if places will charge just for that or provide one for free. If you do replace it, I would recommend the Sigma 17-50/2.8 ove...
Posted by Jonathan-Mac on 12/10/2021 - 08:12
Pentax SMC A 28-135 f4
https://chiswickcameras.co.uk/products/pentax-a-28-135mm-f4-smc-lens/ Had one a few years back, the big plus is the constant aperture throughout the complete zoom range, but it needs stopping down to get best sharpness and it used to purple-fringe a lot (more than I was happy with fixing in PP).
Posted by LennyBloke on 15/10/2021 - 09:53
Full Frame Telephoto Zoom
Sigma 100-300mm f/4.0 APO EX DG (mark 2 version) which performs very well with the matched, 1.4X APO DG teleconverter. These do come up in PKA mount from time-to-time, but tend to sell quickly. I've had one from new and it'll probably be interred with me :lol: Tamron 70-200mm F2.8 Di LD Macro - f...
Posted by prsjnb on 20/10/2021 - 20:16
In stock now
I'm tempted but might wait until there are some cash back offers. I'd really like a standard walkabout zoom that I was happy with. When I bought my K-3 I bought a Sigma something or other and I never bonded with it. I haven't used it for a few years. Mostly I use the 31mm as a standard lens. I...
Posted by womble on 31/10/2021 - 08:00
Dzofilm Vespid or Meike lenses
While I've not heard of the Dzofilm Vespids I've seen a lot of positive reviews for the pro mist filters. You could look to expand your choice of lenses with some vintage/film era lenses, as I know some people have adapted them for film use by adding focus pull rings to the existing bodies. If yo...
Posted by Benz3ne on 02/11/2021 - 08:26
Back Focusing HD DA 70mm F2.4 Limited
I've never been fully satisfied with the sharpness of my HD DA 70mm Limited that I had bought this summer. When I took a candle lit photo of my grandson last weekend with the lens wide open it was apparent the focusing was definitely out. I've had a play around today checking for back focusing by ...
Posted by PRYorkshire on 09/11/2021 - 22:28
Back Focusing HD DA 70mm F2.4 Limited
This is the first time that I have found a lens to be this far out, particularly with it being a new Limited. Back/Front focus issues have been with us since AF first appeared in the 1980's. Only with higher MP cameras and the ability to pixel-peep do we notice them as much. They can be caused by...
Posted by pschlute on 09/11/2021 - 23:15
Back Focusing HD DA 70mm F2.4 Limited
Front or back focusing is quite common but can be remedied, though it's been my experience that the AF systems on my K200D and K-3 still aren't precise enough to always hit the mark. Focusing on a ruler is not a good way to do this because the AF "point" is not really a point at all, rather an ar...
Posted by Jonathan-Mac on 15/11/2021 - 14:10
Back Focusing HD DA 70mm F2.4 Limited
I have done extensive testing on My K1. It suffers with a general BF. I need on average +7 for accurate focus, but on some lenses it requires +5 and on a couple +10 is only just enough. Have you considered using the debug menu to adjust the fine tuning to include this offset? It doesn't take long at...
Posted by HarisF1 on 15/11/2021 - 15:38
Back Focusing HD DA 70mm F2.4 Limited
I have done extensive testing on My K1. It suffers with a general BF. I need on average +7 for accurate focus, but on some lenses it requires +5 and on a couple +10 is only just enough. Have you considered using the debug menu to adjust the fine tuning to include this offset? It doesn't take long at...
Posted by pschlute on 15/11/2021 - 18:45
1930s Meyer Trioplan on a Pentax K1
Having spent quite a bit of time looking at these super sharp shots, I have reached a decision, I am placing all my lenses in a box and hiding them away. I will go back to drawing things instead. And sulk as well. So there.
Posted by takuman on 15/11/2021 - 10:01
Pentax DFA*50mm 1.4
I’m just curious about it, I’m thinking of purchasing the dfa*50 1.4 ,maybe by Christmas I’ve very recently got my hands on a k1ii with 400 odd shutter count and I’m thrilled to be back in full frame or 35mm as was to myself in the film days. I know some of the members on here have far more skill...
Posted by Flan on 15/11/2021 - 20:52
