Search results for 'back focus' - page 977
DA*16-50 Comments
To test, I used Live view and focussed at f/2.8 and the result was superb! But (big but), using normal focus it was massively out. Actually, to be more precise, my K-5 was out and so was the lens. So, I tweaked about (with some other techniques that I may document sometime!) and got the DA*16-50 foc...
Posted by stevejcoe on 30/01/2012 - 14:45
DA*16-50 Comments
Steve - the forgettory has forgotten :D :P I think I was experimenting with focus adjustment methods. The standard method is to use a focus assist chart at 45 degrees (horizontally preferably as shown by Pentax's service manual, which keeps the camera level). I was probably making use of the p...
Posted by MattMatic on 30/01/2012 - 15:22
DA*16-50 Comments
Mine should be arriving tomorrow, will have to have a go at it :) so far 2 out of 6 of my lenses including my 40mm and the 18-55 WR are off by a little bit. The 50-135 is spot on as are the rest of my pancakes and the 10-20 (although i find it generally a tiny bit soft). If colours and contrast a...
Posted by vrapan on 30/01/2012 - 20:48
DA*16-50 Comments
It's an excellent match to the DA*50-135 :-) LR3 has the correction parameters for it so it does look great when using raw. It's just the blue/yellow LCA that causes a bit of a problem sometimes, but it is such a lovely piece of glass. Bokeh, colour and contrast are loverly!! BTW most of my lens...
Posted by MattMatic on 30/01/2012 - 21:24
Tamron AF 18-200mm
I had a look at these two lenses a while back with mind of buying one or the other, the Tammy seems to get slightly better reviews than the Sigma and that's the one I would have gone for. I ended up buying the Sigma 17-70 2.8 OS HSM for some reason:shock::?. Here`s a link with some cracking shot...
Posted by Cliff-P on 26/06/2011 - 18:59
Tamron AF 18-200mm
When I first got my Tammy 18-250 I struggled to get ANY results at the long end.:( Then I updated the camera firmware and haven't looked back..:D
Posted by Hardgravity on 27/06/2011 - 16:07
Wana buy a lens?
I've been keeping an eye on those sales. As a K series fan there are one or two or thirteen lenses I'd like. Unfortunately, the opening price is about what I'd expect to pay and there are no bargains to be had. Still, I am going to have to be strong or I may have a hole in my bank balance. BTW,...
Posted by womble on 26/06/2011 - 13:51
Wana buy a lens?
BTW, some time back I was asking about the wooden tripod supplied with the older long lenses. The 2000mm comes with one, the first I have seen on ebay. K. So it does... on the 2nd photo... I've never seen one before. Looks quite solid with 2 metal straps holding each leg :shock:
Posted by Algernon on 26/06/2011 - 14:39
Some new lenses
I'd like a go with the 60-250. I fully expect the IQ to be excellent, but I'd like to evaluate the focus speed in terms of my own shooting style. Was this an Ebay job Lot John or did you buy them all separately
Posted by Smeggypants on 27/06/2011 - 02:56
Some new lenses
Congratulations on the lottery win!:wink: The problem I found with the 60-250 is that it initially focusses very quickly but the fine tuning takes too long. I had too many OOF shots because it appeared that the shot was in focus but it was slightly out. Not always obvious at 250mm and f/4.0. ...
Posted by greynolds999 on 27/06/2011 - 09:16
Some new lenses
Very nice collection indeed. I have read in a few places that, for whatever reason, SDM lenses seem to focus faster on the K5 than the same copy of a lens will do on older bodies. Obviously the motor is the same, but maybe the AF is achieving lock quicker or something?
Posted by MrCynical on 03/07/2011 - 18:40
Some new lenses
I spent all today using the 60-250mm at Martin Mere and the focus locked on quickly and positively. Out of 250 shots, just two were out of focus. I'm no expert at flying birds, but one of my first successes came today and I'll post in in the Gallery shortly. Although I've still got to decide w...
Posted by johnriley on 03/07/2011 - 19:36
Some new lenses
Then the only thing I can think of suggesting is to log out and log back in again. Otherwise, a report to IT and I'm sure they will be able to help.
Posted by johnriley on 04/07/2011 - 22:40
Some new lenses
I've got a Tamron AF 28-90mm that I bought about the same time as a Pentax Z1-P It hadn't any aperture scale or distance markings so they were not needed on the later film cameras. The MTF figures do look very odd. Could it be a focus error?
Posted by Algernon on 05/07/2011 - 15:04
Some new lenses
No, there's a star focus point on the chart and focus is done very carefully. In addition, the chart is absolutely huge so there's no real issue with working distance. Just accept it is what it is - the computer does the chart automatically. Magic, it has to watched doing it to be believed. The t...
Posted by johnriley on 05/07/2011 - 15:10
Some new lenses
The MTF figures do look very odd. Could it be a focus error? The centre is sharper from f/4 onwards. John
Posted by johnwhit on 05/07/2011 - 15:11
Some new lenses
The Photozone test shows Excellent in the centre for all apertures...... I still think it's a focus error? DOF would compensate at f/4 onwards Edit: Also Excellent on this test
Posted by Algernon on 05/07/2011 - 15:26
Some new lenses
Unfortunately they are all different lens samples as well as different testers - a direct comparison can never be made. However, comparisions can be made between different lenses tested by the same tester, provided of course that the testing situation has not changed. I would point out that as fo...
Posted by johnriley on 05/07/2011 - 15:34
Some new lenses
John what kind of focus did you use, the Phase AF or the contrast AF in live view? I would suggest doing the later since you bypass all AF calibration errors with that.
Posted by Anvh on 05/07/2011 - 16:06
Some new lenses
I usually find when testing by photographing banknotes etc. 3 shots of every 4 are often out at say f/2. The sharpest is often the one with the biggest file size :shock: MF is usually the most reliable. I've never tried live view. I do use a 2x Refconverter though. The Eye-Fi card also comes in ...
Posted by Algernon on 05/07/2011 - 17:01
