Search results for 'back focus' - page 2059
Fitting old lenses on DSLR
A dealer set up my K20D with my old Super Takumar 1:4/150 I cant get it to focus but it used to. Any suggestions? It should focus just the same as it always did, manually! Do you mean you cannot get the full focussing range from it, or perhaps you mean get a correct exposure reading using it. Just...
Posted by JAK on 09/12/2011 - 21:50
Fitting old lenses on DSLR
Check the M42 to K-mount adaptor. If it is the type that fits entirely inside the K-mount on the camera (i.e. the camera body is flush with the back of the lens) then it should focus as normal. If it is the type that has a wide flange that sits against the back of the lens and makes the lens sit s...
Posted by davidstorm on 09/12/2011 - 23:56
computer problem.
Thanks. I have followed all the obvious checks. I am inclined to believe that the Bios is the problem. As this machine is a local business built one and not purchased from one of the usual makers I am at a loss to know how to uncorrupt the Bios. All attempts to bring the machine back to life a...
Posted by thoramay on 13/12/2011 - 15:47
Focus Adjstment - K7 with 55-300.
I believe my 55-300 is focusing behind the subject that is in focus (to the best of my ability) in the viewfinder. Some help please: At what focal length should I test-focus the lens? At what aperture? Is the process reversible? I'm using the Tim Jackson test chart, version V2.00. ...
Posted by coker on 17/12/2011 - 17:41
Focus Adjstment - K7 with 55-300.
Test it wide open at 55mm and 300mm .. if you get the same result then make the alteration on the K-7. If you get a different result for each focal length then decide which you use the most then adjust for that (I use mine almost exclusively at 300mm) or find a happy medium. Yes it is fully re...
Posted by Mike-P on 17/12/2011 - 19:09
Focus Adjstment - K7 with 55-300.
Thanks, Mike. Will let you know how I get on! Roger.
Posted by coker on 17/12/2011 - 19:27
focus adjustment 2
this may seem a silly question but at what distance from chart do you test. have seen varying methods from use min focus then back off a few inches to 50x focal length of lens so that would put 300mm lens 15 m from target,don,t have that amount of room.also what size should the chart be. as i have n...
Posted by redbusa99 on 19/12/2011 - 13:05
focus adjustment 2
I usaully move in as close as possible, to minimise depth of field, which I find gives the best results. A standard A4 printout is fine. Points to note Set the aperture to wide open. Use natural light Make sure the camera is secure on a tripod and set very accurately at 45 degrees to the chart...
Posted by stevejcoe on 19/12/2011 - 14:00
focus adjustment 2
thanks steve . i thought 50x focal was a bit far.
Posted by redbusa99 on 19/12/2011 - 19:12
New Tamron 17-50mm Lens - is it a bad copy ?
Dear Fellow Pentaxers, I purchased a new Tamron Lens ( 17-50mm ) from Hong Kong for my Pentax K100D. I used 'automatic mode' on the my pentax k100d and took a snapshot. The picture was not sharp and it was slightly blurred. Does this mean it's a bad copy?. Is there any way I can test it ? - some...
Posted by k-5 on 20/12/2011 - 09:51
New Tamron 17-50mm Lens - is it a bad copy ?
what mat says, yes They sometimes need substantial AF adjustment. Mine has -8 at the moment. The front element can depart from the lens. It will feel loose. There is a simple fix somewhere.... I would take a pic of something on a wall with the zoom at 35mm and the aperture at f5.6. Us...
Posted by dougf8 on 20/12/2011 - 10:59
K-r plus Sigma 50-150mm f2.8
Each Sigma lens has a code which relates to a model in their range which tells ACR what lens was used for the picture. Unfortunately (with Pentax) it seems they have used the same number for a few different lenses ... the 50-150mm, MKI 70-200mm f2.8 and 100-300mm f4 all have the same code. Ver...
Posted by Mike-P on 20/12/2011 - 19:49
Front focus problem
Hi all, After having a Katzeye screen installed for over a year, my K200D has suddenly developed a front focus problem when manually focusing using split prism. The screen was previously perfect without installing any shims. I haven't made any adjustments to the camera or screen to cause this a...
Posted by Jonathan-Mac on 21/12/2011 - 09:44
Front focus problem
If the screen is the same as the K10D/K20D then I have a LL-80
Posted by Mike-P on 21/12/2011 - 11:26
Front focus problem
Doesn't look like it is the same so ignore my post. :D
Posted by Mike-P on 21/12/2011 - 11:30
Front focus problem
I think the K200D screen is a bit smaller than that of the higher grade cameras, which is why neither the screens nor the shims from them will work :(
Posted by Jonathan-Mac on 21/12/2011 - 14:10
Front focus problem
Somewhat later than planned, I've finally gotten around to changing the shim. I ordered a full set from Johnson's Photopia (who were excellent to deal with) and had to wait around six weeks for them to receive stock of a couple of the shims before they sent them. The full set cost around 35 quid w...
Posted by Jonathan-Mac on 25/03/2012 - 13:28
Front focus problem
Dont procrastinate, get that lens
Posted by gartmore on 25/03/2012 - 21:45
MF on lens or body?
I have a K20d with DA16-50 currently fitted I seem to remember reading if you have manual focus switch on the lens you should use this over the one on the body? Not sure if that is correct, however if I use the lens switch and leave the one on the body to AFS then the shutter will not operate un...
Posted by SteveT on 21/12/2011 - 21:19
MF on lens or body?
Not sure if that is correct, however if I use the lens switch and leave the one on the body to AFS then the shutter will not operate until its in focus, so which is correct? You have catch in focus enabled?
Posted by Mike-P on 21/12/2011 - 22:42
