Search results for 'back focus' - page 2079
Pentax DA50mm f1.8 new lens green fringing
Ok... dog shot: purple fringe above its right eye and green fringe over snout. That's axial CA from wide open. Expect this - it's quite normal in very wide aperture lenses (as I said). Correct in LR. Oh, and the dog shot looks soft due to motion blur. 1/50 at 50mm isn't fast enough unless the sub...
Posted by MattMatic on 10/10/2012 - 10:23
Pentax DA50mm f1.8 new lens green fringing
This is a good explanation of chromatic aberration and if a Canon EF 85/1.2 L USM shows it I don't think we can complain. http://toothwalker.org/optics/chromatic.html Dean, be careful using AF in poor light or tungsten lighting it's usually inaccurate. Try MF instead. Edit: Matt posted w...
Posted by Algernon on 10/10/2012 - 10:36
Pentax DA50mm f1.8 new lens green fringing
If you look at the pop-up VFA Target Test at the bottom of this frame it's very purple at f/1.8 http://slrgear.com/reviews/showproduct.php/product/1519/cat/45 Ricehigh describes a quick way of carrying out focus adjustment on AF lenses only here: A very important point to note about ...
Posted by Algernon on 10/10/2012 - 11:00
Pentax DA50mm f1.8 new lens green fringing
Algernon I have now calibrated the focus much more prcisely than it was! it needed -4 adjustment in the custom menu 21 on K-r af fine asjustment Thanks for the advise I will see how I get on Many thanks everybody for your advise It would seem that two things were at work here... ...
Posted by disco_1111 on 10/10/2012 - 11:50
Pentax DA50mm f1.8 new lens green fringing
hi guys it seems we have cracked it these 2 crops are the da50mm at f5.6 and the da18-55 kit lens at the same aprrox 50mm focal length and im pleased to say the 50mm prime now appears sharper across the whole frame and this has reduced the green fringing so it would seem the focus calibratio...
Posted by disco_1111 on 10/10/2012 - 12:35
Pentax DA50mm f1.8 new lens green fringing
I'm glad that you've sorted that out, but I think the kit lens shot is out of focus.... better to try it outside. I wouldn't think you'd see much difference. To give you some idea of what to take and because I mentioned how good this zoom was earlier in this thread..... These are just some ...
Posted by Algernon on 10/10/2012 - 13:25
Pentax DA50mm f1.8 new lens green fringing
hi guys it seems we have cracked it these 2 crops are the da50mm at f5.6 and the da18-55 kit lens at the same aprrox 50mm focal length and im pleased to say the 50mm prime now appears sharper across the whole frame and this has reduced the green fringing so it would seem the focus calibratio...
Posted by Pentaxophile on 11/10/2012 - 07:55
Pentax DA50mm f1.8 new lens green fringing
The F 35-70mm is OK, but not remarkable IMHO. The macro setting makes it messy to use under some circulstances. The knock on the door around 3:30pm today was a ParcelForce driver delivering a F 35-70mm that I bought on Friday from SRS. My initial impressions are that it is good. I've only manage...
Posted by andrewk on 15/10/2012 - 19:17
Pentax DA50mm f1.8 new lens green fringing
and the one on the right looks OOF. It does look soft, but I don't think the kit lens was out of focus. I took several shots and they all look the same. All of them looked properly focussed in the split-image screen I have in the K200D and all had focus confirmation. In any case, at f/8 with an ob...
Posted by andrewk on 15/10/2012 - 22:54
Pentax DA50mm f1.8 new lens green fringing
It's worth standing a ruler at 45deg alongside your test item. You can see where the focus is better. This was a quick test with the Chinon 50mm f/1.9 which isn't consistent with the point in focus. It should be at 100mm and the box looks in focus, but the ruler indicates about 80mm The Bri...
Posted by Algernon on 16/10/2012 - 08:16
Pentax DA50mm f1.8 new lens green fringing
I use a K200D, so I don't have the option of micro-adjusting focus for each lens. The best lenses in use are those that produce the best results irrespective of any micro-focussing errors that could theoretically be corrected if I had a different camera. In real use, I usually verify focus both usin...
Posted by andrewk on 16/10/2012 - 08:59
Crash! Bang! Wallop!
Last night, my KR fell off a tripod. It works okay except....my status screen will no longer auto rotate. Any ideas? On holiday a couple of weeks ago, my KR was in the shoulder back which fell off something onto the floor. Later, when I opened the bag, the filter on the front of the Sigma 10-20 ...
Posted by jeallen01 on 13/10/2012 - 12:02
My today's fighting against polarising filter
Another alternative is to press the lens - and hence the filter - down onto a mouse mat. Then grip the lens firmly and try to turn. Of course, if the filter has its own rotating front element - all bets are off. I have had success removing a cross-threaded filter by running the blade of a very s...
Posted by DoctorJeff on 13/10/2012 - 10:06
My today's fighting against polarising filter
I bought an 86mm CPL filter for my Sigma 50-500, just one from eBay, not the cheapest but relatively cheap, and that was quite poor in how it screwed on to the lens. When I tried it at the weekend I also found that it affected focus quite badly, whether that was because it's rubbish, or because it w...
Posted by droopsnoot on 17/10/2012 - 10:56
My today's fighting against polarising filter
I bought an 86mm CPL filter for my Sigma 50-500, just one from eBay, not the cheapest but relatively cheap, and that was quite poor in how it screwed on to the lens. When I tried it at the weekend I also found that it affected focus quite badly, whether that was because it's rubbish, or because it w...
Posted by Daniel Bridge on 02/04/2013 - 22:32
I'm looking for a camera & lens repair guy in London!
Chinons are usually easy to strip. Very often a small screw on the focus barrel which when removed allows all the front to be screwed off. You don't even have to remove the beauty/name ring. Very well made as well.
Posted by Algernon on 13/10/2012 - 12:23
K200 Top LCD Panel
Back to the manual I think, unless someone else who owns the camera knows the answer?
Posted by johnriley on 21/10/2012 - 18:01
DA 300mm - back focusing?
Got my Amazon special today. It's a miserable misty day so probably not the best time to test it, but it seems, to my eyes anyway, to be focusing slightly behind and to the left? It might just be me being fussy, but I've read about back/front focusing, but never actually experienced it. I've p...
Posted by milamber on 23/10/2012 - 11:49
DA 300mm - back focusing?
Looks like a tad of back focusing to me. The last shot - the give away is that the area of tile just to the left of the feet looks sharper than the bird. Simple adjustment in the K5 and K7 - custom menu, AF adjustment (on the last page). You have a choice of "Apply All" (leave that as it is) ...
Posted by MattMatic on 23/10/2012 - 11:55
DA 300mm - back focusing?
Ricehigh has a good method for adjusting the focus: http://ricehigh.blogspot.com/2010/01/k-x-debug-mode-tutorial-af-adjustment.html -
Posted by Algernon on 23/10/2012 - 12:04
