Search results for 'back focus' - page 2091
K-5 Focus Questions
I think Gary is right to a large extent and Smeggy too. The new K-5II bodies are so much more accurate and consistent in their focussing, but I have to say that since calibrating my lenses on the original K-5 I now turn to it with much more confidence than I used to have, especially with lenses tha...
Posted by davidstorm on 25/04/2013 - 23:38
K-5 Focus Questions
I think I've posted this before but worth another post IMHO: http://www.dpreview.com/articles/7333489584/variation-facts-and-fallacies I have no trouble calibrating all the 3rd party AF lenses I've tried, these include Sigma 10-20, Sigma 24/2.8 AF, Tamron 90/2.8, the Tamron being the only one ...
Posted by johnwhit on 26/04/2013 - 19:52
K-5 Focus Questions
That certainly was worth posting again
Posted by gartmore on 27/04/2013 - 10:08
K-5 Focus Questions
Following recent posts and focussing issues I've been having with my K-5, I wonder whether anyone knows the answer to the following question: Would it be technically / theoretically possible for the Pentax engineers to release a firmware update for the K-5 mk1 that would improve the AF performanc...
Posted by davidstorm on 29/04/2013 - 21:17
K-5 Focus Questions
I've been trying to get to grips with calibrating the focus on a DA*50-135mm I picked up off eBay a couple of weeks ago. I've since tried to calibrate all my lenses. What a can of worms it's turned out to be. I'm really glad to have found this thread and discovered the focus correction feature ...
Posted by WaypointCharlie on 29/04/2013 - 21:40
K-5 Focus Questions
David, I think a possible improvement would be to tweak the algorithm so the focus is much the same if approached from the long end or the short end. But even if it were possible technically do you suppose it would get past the marketing department? It would cannibalise sales. Improved focus accu...
Posted by WaypointCharlie on 29/04/2013 - 21:46
K-5 Focus Questions
I've been trying to get to grips with calibrating the focus on a DA*50-135mm I picked up off eBay a couple of weeks ago. I've since tried to calibrate all my lenses. What a can of worms it's turned out to be. I think the problems described in this post are the reasons I haven't tried to calibrate ...
Posted by johnha on 29/04/2013 - 23:37
K-5 Focus Questions
Hi Charlie Firstly, as detailed on numerous posts recently, the K-5II and K-5IIs are in a different league to the Mk1 K-5 when it comes to focussing. The biggest issue I have with the K-5 is not so much the focus accuracy once calibrated, but the inconsistency. Sometimes it's off, sometimes it'...
Posted by davidstorm on 29/04/2013 - 23:39
K-5 Focus Questions
Thanks David. Do you also use zoom lenses or is it mostly primes? I'm wondering how consistent the focus is at various focal lengths and subject distances. By the sounds of it a II/IIs could fix the problems I'm having with auto focus, but I'd like to try before buying.
Posted by WaypointCharlie on 30/04/2013 - 07:38
K-5 Focus Questions
Hi Charlie, I use both primes and zooms, mostly zooms unless I'm on a particular shoot where a prime is vital, like for example a wedding where the Sigma 105mm DG EX Macro has proved itself to be something of a superstar, particularly when fixed onto the K-5IIs. My other main lens is the DA 17-70...
Posted by davidstorm on 30/04/2013 - 22:04
K-5 Focus Questions
Thanks, you've convinced me. I suspect there's nothing particularly wrong with my 18-250 lens as I notice a similar focussing (or lack of it) characteristic with the DA*50-135. Now it's a question of a II or a IIs. If it wasn't for the potential aliasing the IIs would be a no brainer. I wond...
Posted by WaypointCharlie on 30/04/2013 - 22:46
K-5 Focus Questions
I've PM'd you Charlie with hopefully what will be useful info, particularly on the K-5IIs moire issue (or should I say non-issue as there isn't a problem in real world use) and the DA*50-135 lens. Also, you should not experience any indifferent focussing with the 50-135 at any focal length; if you'...
Posted by davidstorm on 30/04/2013 - 23:39
K-5 Focus Questions
Hi David, What is critical focus and how does one achieve it? Thanks!
Posted by major on 05/05/2013 - 23:48
K-5 Focus Questions
Hi David, What is critical focus and how does one achieve it? Thanks! I'm not sure if this question in tongue-in-cheek, but I'll answer it as best I can. What I meant by critical focus is pin sharp in the right areas. It is achieved if the lens is good, is calibrated correctly to the camera and th...
Posted by davidstorm on 06/05/2013 - 10:05
K-5 Focus Questions
I can assure you it was not, David! :cry: My lack of experience, knowledge and skills was not obvious to you and others, probably!! But that's OK by me! I find that you are one of the most helpful chap (amongst many) on the forum. I learnt something new today, which leads me to my next ques...
Posted by major on 06/05/2013 - 11:26
K-5 Focus Questions
how do I know if my lenses are correctly calibrated to my camera. I have a K5-11s, 18-135 and 15mm. That is a very good question and is not easy to answer. The only way is to test the lenses methodically. The way I do it is as follows: 1. Set camera up on a tripod 2. Get a subject that aid...
Posted by davidstorm on 06/05/2013 - 12:15
K-5 Focus Questions
I much appreciate and thank you for taking the time to outline your method of calibration . I'll have a go although the process looks beyond my technical ability! :| However, you may well be right about doubting whether my camera needs adjustment! I just needed to be sure that my equipment...
Posted by major on 06/05/2013 - 23:46
problem with AF-360 FGZ Flash
I guess I'd have to agree, if behavior was consistent and made sense for three years and is different now, sounds like a problem. The only thing I find that affects the shutter speed and might lock it at 1/90 is the trailing shutter-sync switch. It may be that the switch is faulty. Although if tha...
Posted by amoringello on 02/04/2013 - 22:30
What has caused this effect?
I had the same with uv/skylight filters, not just with the sun either, so took them off now, still carry the uv for the hazy days but I don't think it has been back out of its box.
Posted by InFESTation on 05/04/2013 - 09:08
What has caused this effect?
It is a ghost image caused by light reflecting from the lens back onto the rear surface of the filter, yet another good reason for not using them! :wink: I have a few genuine Pentax Ghostless UV filters which are curved to prevent this effect happening. Although no longer made and they only come...
Posted by gartmore on 05/04/2013 - 10:14
