Search results for 'back focus' - page 797
can back focus be fixed?
There was a wonderful link a little while back to this topic. Essentially, lenses are made to within a certain tolerance, and so are camera bodies. This gives the possibility that if a lens is at one extreme of its tolerance, and the camera body at the other, the combination will seem awful. If, ho...
Posted by ericp on 13/07/2009 - 00:55
can back focus be fixed?
Hopefully someone will find the link to the article which was about all makes of camera / lens. Good luck with it all. Kris.
Posted by womble on 13/07/2009 - 03:43
can back focus be fixed?
Nathan gave us the link but I can't find it now. It explains a lot about how different people get different reactions to lenses. Mike
Posted by mikew on 13/07/2009 - 07:25
can back focus be fixed?
I had the same problem on my 16-50 DA*, it can only be fixed by adjusting the focus of the CAMERA and not the lens. You either need to have the camera and lens calibrated by a Pentax service center, or you can do it yourself. I downloaded a small application from the web, plugged my camera into th...
Posted by Ambuscher on 13/07/2009 - 08:36
can back focus be fixed?
But if all other lenses focus fine and this one doesn't isn't there the risk getting this one right screws up the others? With the K10 you only have one adjustment I believe. I can't see why Pentax can't adjust the lens but that's probably my ignorance. Mike
Posted by mikew on 13/07/2009 - 08:39
can back focus be fixed?
You do have a point there, in my experience all my lenses were out to varying degrees so I made an average adjustment for all my lenses with consideration for the one I used the most. The adjustments are so fine you bascially are adjusting mm at a time which is only really visible when shooting clo...
Posted by Ambuscher on 13/07/2009 - 08:56
can back focus be fixed?
Tolerances in manufacturing are inevitable - nothing in this world is 100% accurate at any price. However, you should expect that a lens will work fine on your camera body and usually they do. In cases where they don't, then recollimating the lens will no doubt put it right. The K20D goes a st...
Posted by johnriley on 13/07/2009 - 08:57
can back focus be fixed?
Nathan gave us the link but I can't find it now. It explains a lot about how different people get different reactions to lenses. Mike This is the link that Nathan posted http://tinyurl.com/cwmjgo. The problem arises when the camera and lens are are opposite ends of their tolerances ranges. In ...
Posted by stevejcoe on 13/07/2009 - 09:00
can back focus be fixed?
Thanks Steve both for the link - which I think could be made a sticky somewhere and for confirming that my thoughts on the K10 adjustment were correct. Mike
Posted by mikew on 13/07/2009 - 09:08
can back focus be fixed?
But if all other lenses focus fine and this one doesn't isn't there the risk getting this one right screws up the others? With the K10 you only have one adjustment I believe. Mike Correct. So on my K10 I measured many of the lenses in my collection that had a focal length of around 50mm and then ...
Posted by GlynM on 13/07/2009 - 09:30
can back focus be fixed?
Thanks for posting the link to the article again Steve. It is a very good read and explains quite a lot. But if its an f1.4 lens with a very shallow depth of field, the front focusing will be noticeable: the subject will be out of focus and soft. I have two lenses at f2.8 and one at f1.4 and have...
Posted by ericp on 13/07/2009 - 10:53
can back focus be fixed?
I am curious though, has anyone had any problems suddenly after upgrading to a new body or noticed a lens works perfectly on one body but not the spare? That's one of the first things i did after i got my k20.It's quite a few pictures to take if you've got a few lenses. All seems fine:wink:
Posted by sanderscapes on 13/07/2009 - 15:52
can back focus be fixed?
It's a fine link that Nathan posted about front and back focusing but it doesn't explain what effects that tolerance in the lens. In a way the AF unit in the camera works like our eyes, it looks through the lens and confirms focus that way. So if the Lens is out with -10 (don't know what would b...
Posted by Anvh on 13/07/2009 - 17:49
can back focus be fixed?
as your all probalbly aware and feed up of hearing about my sigma 150-500mm which is back at sigma again for recalabration as the could't get it right in the first place, sigma now have my k20 to focus the lens to the body, this makes the af adjustment in body usless, if they cant 0 calibrate a lens...
Posted by scottthehat on 13/07/2009 - 17:57
can back focus be fixed?
kris here are all the back focus issues https://www.pentaxuser.com/forum/search/back-focus jack.
Posted by jackitec on 13/07/2009 - 18:04
can back focus be fixed?
I am curious though, has anyone had any problems suddenly after upgrading to a new body or noticed a lens works perfectly on one body but not the spare? That's one of the first things i did after i got my k20.It's quite a few pictures to take if you've got a few lenses. All seems fine:wink: I am sur...
Posted by ericp on 13/07/2009 - 21:55
can back focus be fixed?
.....(My 16-50mm is for sale by the way if you do end up back on the market for one, but that's not the reason I am writing this, m'lud, honest)..... Thanks :D I want something brand new so I can blame Pentax if it is not sharp :lol:
Posted by ericp on 13/07/2009 - 22:04
can back focus be fixed?
I've got a 16-50mm too. Just new. Seems great so far. I have heard about all these quality control issues as well which has scared me a bit. One thing i can't get me head around is this back focusing issue with the lense. What is exactly going on and is it tested on various levels from manual to mul...
Posted by mattox on 14/07/2009 - 18:38
can back focus be fixed?
I too am a recent owner of the 16-50 and I have to say mine focusses perfectly. Just make sure any testing you do is under natural light, not the kitchen lamps in the evening !
Posted by pschlute on 14/07/2009 - 20:20
18-55 WR
Well the K7 and kit lens arrived this morning following a tour of Lincolnshire courtesy Parcelforce and as yet the battery is still charging so no comment on the K7 apart from my disappointment with the little nasty rubber doors (one of the reasons I rejected Nikon) still I will have to learn to lov...
Posted by Thordell on 13/07/2009 - 12:46
