Search results for 'back focus' - page 1741
Unusual lens problem
I don't think the calibration would cause this Dave, although I can't dispute your findings so far. I've calibrated all my lenses on the K-5 and K-5IIs with no strange symptoms. It sounds more like an electrical issue to me; if it's behaving correctly now I would be tempted to re-do the calibratio...
Posted by dcweather on 25/04/2013 - 01:37
Unusual lens problem
I had a similar experience about a week ago when I tried to take some shots with my K5II + Sigma 150-500mm. AF was all over the place, it would seem to focus OK, then shift the lens a little more making the image in the VF very OOF. The remedy was to remove it and clean the electrical contacts...
Posted by Mannesty on 25/04/2013 - 11:24
Maybe light at the end of the tunnel?
Now there is a mixed response. I'm interested in a FF to try some of my FF lenses as they were designed to be used. As Carl said, I too would not be too upset if Pentax did not release another body for a couple of years as I personally would spend money on other brands to fill in the gaps. ...
Posted by K10D on 25/04/2013 - 13:10
Maybe light at the end of the tunnel?
I like the fact Pentax have never got caught up in the gimmick war or huge pixel counts. I'd even be happy if they gave up on the movie mode. Only shot one movie in 2 years and everyone i know is the same. Basically tried it once to make sure it works, never touched it again. A Nikon rivalling AF ...
Posted by Smeggypants on 25/04/2013 - 23:06
Maybe light at the end of the tunnel?
I think Pentax did a bloody fine job with the K-5II and IIs. They took a camera that was highly regarded by those who own one and lifted it subtly but significantly, especially with the IIs. I have both the K-5 and the IIS and it is the IIs I always turn to when I want that extra little bit of qua...
Posted by davidstorm on 25/04/2013 - 23:32
Maybe light at the end of the tunnel?
Ditching the K-Mount would be the most stupid thing Pentax ever did. Part of the kudos of Pentax is the lens backwards compatibility and if/when they bring out a FF body you can bet that the marketing PR will be promoting the ability to use classic lenses over a period of 4 decades. On that basis...
Posted by gwing on 26/04/2013 - 10:33
Maybe light at the end of the tunnel?
Ditching the K-Mount would be the most stupid thing Pentax ever did. Part of the kudos of Pentax is the lens backwards compatibility and if/when they bring out a FF body you can bet that the marketing PR will be promoting the ability to use classic lenses over a period of 4 decades. On that basis...
Posted by Don on 26/04/2013 - 15:14
Maybe light at the end of the tunnel?
I think it's a shame that it seems to be thought of as "light at the end of the tunnel", which implies at last emerging from dark and dismal days. In fact, the Pentax range is very attractive and there are lots of interesting and desirable products that work well, are made well and sell at someti...
Posted by Dogsbody on 02/05/2013 - 21:01
Maybe light at the end of the tunnel?
Way back when in my film days I had a very expensive foray with a Canon EOS 5, 28-135 IS lens & grip. I thought it was necessary because my Pentax kit was a disparate collection of M, F & FA lenses and my only really good 'modern' body was my Z-1 (supported by a Super-A & MX). These were the days wh...
Posted by johnha on 02/05/2013 - 21:41
K5II - centre focus point - AF at f2.8 - What?
I saw a post elsewhere that commented on how the centre focus point of the K5II will work at f2.8, (in the horizontal plane), and that this was an improvement on the K5 et al. This morning I saw another post where the OP was looking forward to a firmware upgrade enabling his Canikon to focus at ...
Posted by JohnX on 25/04/2013 - 09:34
K5II - centre focus point - AF at f2.8 - What?
It sounds nonsense to be honest. Cameras need light to focus like eyes do and the last time I checked Pentax were advocating lenses of f/5.6 or wider, but the whole world has changed since then. No doubt the current figure is around somewhere, and it might be f/8, but I don't think it has much be...
Posted by johnriley on 25/04/2013 - 09:38
K5II - centre focus point - AF at f2.8 - What?
Maybe what this was referring to was using the 1.7x AF converter. The original instructions say that to ahieve reliable AF the manual focus lens used should be at least f/2.8. As the converter loses light, then at the time it was issued no doubt this was right. Whether even that still holds true ...
Posted by johnriley on 25/04/2013 - 09:42
K5II - centre focus point - AF at f2.8 - What?
I use the 1.7AF converter with the DA* 300mm F4 and it works OK
Posted by mille19 on 25/04/2013 - 10:18
K5II - centre focus point - AF at f2.8 - What?
Thanks guys, but no mention of using a converter, although I can understand how/why this would be better with improved AF.
Posted by JohnX on 25/04/2013 - 13:38
K5II - centre focus point - AF at f2.8 - What?
This morning I saw another post where the OP was looking forward to a firmware upgrade enabling his Canikon to focus at f8. Guessing he has a 5D MKIII. At the moment the MKIII will only AF up to f5.6 with a teleconverter so for instance the 70-200mm f4 will AF with a 1.4x but not a 2x. Canon ar...
Posted by Mike-P on 25/04/2013 - 17:44
K5II - centre focus point - AF at f2.8 - What?
This morning I saw another post where the OP was looking forward to a firmware upgrade enabling his Canikon to focus at f8. Guessing he has a 5D MKIII. That's right. I'm still not at all clear though why/how this works, especially as Pentax say AF at f2.8 is an improvement (this from the o...
Posted by JohnX on 25/04/2013 - 19:02
K5II - centre focus point - AF at f2.8 - What?
I'm still not at all clear though why/how this works, especially as Pentax say AF at f2.8 is an improvement (this from the original specs for the K5II). On the basis that AF gets more difficult/impossible at smaller F numbers, surely then the converse is true, so why shout about 'improving' AF point...
Posted by sbrads on 26/04/2013 - 15:24
K5II - centre focus point - AF at f2.8 - What?
I appreciate all your efforts, but I still am not getting it. I understand f2.8 in relation to lenses, but not an AF system. Surely it's the lens maximum aperture that is responsible for the amount of light 'seen' by the AF system and that would be the same regardless of the camera/AF system...
Posted by JohnX on 26/04/2013 - 15:59
K5II - centre focus point - AF at f2.8 - What?
AF is done at full aperture, so the brighter a lens the more light is available for AF. An f/2 lens would allow more light through than, say, an f/11 lens so AF would find it easier to focus, just like our own eyes would.
Posted by johnriley on 26/04/2013 - 16:03
K5II - centre focus point - AF at f2.8 - What?
AF is done at full aperture, so the brighter a lens the more light is available for AF. An f/2 lens would allow more light through than, say, an f/11 lens so AF would find it easier to focus, just like our own eyes would. It's for this reason that I've switched from using a DA* 60-250mm 1:4 lens to ...
Posted by Mannesty on 26/04/2013 - 16:24
