Search results for 'back focus' - page 738
Front Focus Issue - Help Needed
Does anybody have any idea on what I can do? Are there adjustments that i can do on my own? There is no adjustment that you can do on the K10D that won't affect AF with all lenses. Could this be the time to upgrade to the K20D? It allows correction for individual lenses. Alternatively, I sugg...
Posted by iceblinker on 12/12/2008 - 16:27
Front Focus Issue - Help Needed
There is no adjustment that you can do on the K10D that won't affect AF with all lenses. You can do the adjustment for all lenses yourself using Debug mode, but if you send it to Pentax (from what I have read) they can do the adjustment per lens up to 4x lenses
Posted by NorrisTudor on 12/12/2008 - 16:39
Front Focus Issue - Help Needed
I have carried out a number of focusing tests with several of my lenses and my K10D GP. My original results pointed to back focusing on focal lengths shorter than 28mm and front focusing above 35mm. This pattern also repeats itself with the standard 18-55mm kit lens. I assumed that 30-35mm wa...
Posted by stevejcoe on 12/12/2008 - 16:39
Front Focus Issue - Help Needed
if you send it to Pentax (from what I have read) they can do the adjustment per lens up to 4x lenses Where did you read that?
Posted by iceblinker on 12/12/2008 - 16:56
Front Focus Issue - Help Needed
When looking at these charts, don't forget that there will be more DOF behind the focus point than in front, simply because the area in front is closer. So don't try to equalise the DOF on either side of the zero point.
Posted by johnriley on 12/12/2008 - 17:00
Front Focus Issue - Help Needed
if you send it to Pentax (from what I have read) they can do the adjustment per lens up to 4x lenses Where did you read that? Ok you've just cost me an hour trying to find the posts. :lol: Been ages since I read this stuff Look at: http://forums.dpreview.com/forums/read.asp?forum=1036&message=...
Posted by NorrisTudor on 12/12/2008 - 17:30
Front Focus Issue - Help Needed
Can I ask a newbie question? I'm familiar with the concept of back focusing and use it all the time setting up CCTV cameras ( I wish my engineers could grasp the concept :roll: ). But how do you back focus an SLR?
Posted by Father Ted on 12/12/2008 - 20:19
Front Focus Issue - Help Needed
where can i get a chart please any help most greatfully recieved.:P
Posted by scottthehat on 12/12/2008 - 20:29
Front Focus Issue - Help Needed
Ok, Maybe my english doesn't allow me to explain myself well enough for you all to understand. The two K10d I own are absolutely fine with the sequent lenses 100m Macro f2.8 31mm ltd DA 16-50 DA 10-17 Tamron 18-250 da 18-55 The ONLY LENS that is giving me problems is the FA 50mm...
Posted by nathanever82 on 12/12/2008 - 20:32
Front Focus Issue - Help Needed
Your English was easily understandable. What you may not be understanding is that people are making alternative suggestions while we don't know if your lens is faulty or not. My sugestion to upgrade the camera(s), or NorrisTudor's to send the camera(s) to Pentax, would enable an adjustment to be ...
Posted by iceblinker on 12/12/2008 - 21:05
Front Focus Issue - Help Needed
Pete, I appreciate the alternative suggestions that have been made. If I spend £500 on a new body - I will still have a faulty 50mm - and be out by £500. If I send the two bodies to pentax - even with the lens - I will have two bodies that work with the 50mm, but that front focus with all t...
Posted by nathanever82 on 12/12/2008 - 22:25
Front Focus Issue - Help Needed
where can i get a chart please any help most greatfully recieved.:P Mostly used is one. HIH, Martin.
Posted by Malo1961 on 12/12/2008 - 22:27
Front Focus Issue - Help Needed
cheers martin
Posted by scottthehat on 12/12/2008 - 22:34
Front Focus Issue - Help Needed
The K20D will enable you to set the focus for the one lens and keep that setting just for that lens. The camera will in fact keep the settings for up to 20 lens types. Don't forget though that the slight error in focusing that you observe will be insignificant at normal distances and smaller aper...
Posted by johnriley on 12/12/2008 - 22:35
Front Focus Issue - Help Needed
Dear John, I know that the K20 has the option of focus adjustment for up to 20 lenses. I will not buy it anyway, cause I will buy the next in line.... I agree with your point about 'normal use' but it is also true that I use the lens a whole lot, and usually at f1.4 for close up portrait work...
Posted by nathanever82 on 12/12/2008 - 22:44
Front Focus Issue - Help Needed
I was just wondering if the lens itself had become faulty. We have a FA 50mm f1.4 and focusing has never been a problem with either of out K10D cameras. When you tried the zoom lenses at 50mm it only proved that the zoom lenses focused OK, which doesn't tell us anything about what the 50mm lens i...
Posted by johnriley on 12/12/2008 - 22:50
Front Focus Issue - Help Needed
Are you using auto or manual focus in your testing? Have you tried both methods? If you test using both AF and MF, do you get the same result? Does the lens in question focus to infinity correctly? As far as I know (and I'm willing to be corrected) the available adjustment affects AF accuracy ...
Posted by Mannesty on 12/12/2008 - 22:51
Front Focus Issue - Help Needed
where can i get a chart please any help most greatfully recieved.:P Try http://focustestchart.com/focus21.pdf or http://regex.info/blog/photo-tech/focus-chart/ or http://pentaxdslrs.com/newchart.pdf
Posted by Mannesty on 12/12/2008 - 22:58
Front Focus Issue - Help Needed
It's interesting that it's only become an issue relatively recently. How come we never noticed this with our film cameras? I wonder if it's something to do with the more critical depth of focus issues with the smaller APS-C format. The smaller the format the less error in the positioning of the ...
Posted by johnriley on 12/12/2008 - 23:00
Front Focus Issue - Help Needed
Ok now we're talking - I will try to focus to infinity - I have never noticed issues, but I will check tomorrow morning. - I have not tried MF - mainly because my eyesight is not that good and I wouldn't rely on it for fine adjustment - but what I have done is focus one body with the normal ...
Posted by nathanever82 on 12/12/2008 - 23:03
