Search results for 'back focus' - page 2351
k to manual mode for dslr
Also have searched for some method to cut down focus screens from older cameras for DSLR use and no luck--any suggestions from anyone? Have fun. Best regards
Posted by K10D on 19/07/2011 - 00:10
k to manual mode for dslr
Why cut the pin? The pin pushes on the linkage that allows the iris to shut down to the selected aperture. Cutting the pin means that the iris will never stop down, surely? I have just modified a 135mm f2.8 Hoya to allow its use with an M42 to K-mount adapter. This was a simple job. Remove the b...
Posted by DoctorJeff on 19/07/2011 - 10:02
Lens Fine Tune Adjustment
Have been aware of the lens fine tune function for a while but never really gave it much thought until a few days ago. Anyway after reading an article on the web, I thought I would test my lenses for Front Focus or Back Focus issues. all of my lenses were OK apart from the Pentax 15mm limited which ...
Posted by Fletcher8 on 19/07/2011 - 17:53
Lens Fine Tune Adjustment
Interesting, this is maybe the reason I have never obtained, what I would call, pin sharp focus with digital, the way I did with my spotmatic II, and film. I have a K10D, can the focus be fine tuned with this camera ?. Many thanks. Chris R.
Posted by ChrisR on 19/07/2011 - 20:20
Lens Fine Tune Adjustment
Interesting, this is maybe the reason I have never obtained, what I would call, pin sharp focus with digital, the way I did with my spotmatic II, and film. I have a K10D, can the focus be fine tuned with this camera ?. Film has some thickness because of the sensitive grains so focus didn't need t...
Posted by Anvh on 19/07/2011 - 20:39
Lens Fine Tune Adjustment
Interesting, this is maybe the reason I have never obtained, what I would call, pin sharp focus with digital, the way I did with my spotmatic II, and film. I have a K10D, can the focus be fine tuned with this camera ?. Film has some thickness because of the sensitive grains so focus didn't need t...
Posted by Smeggypants on 19/07/2011 - 23:47
Lens Fine Tune Adjustment
Many thanks to Anva and Smeggy, for your input. I have had a look on my K10, and I don’t have a debug option, but I think my firmware is the original, so maybe the debug was added in a later version. Its not that much of a problem, its just that the focus does not have that, what I would call ...
Posted by ChrisR on 20/07/2011 - 09:22
Lens Fine Tune Adjustment
It was never intended that users would hack their way into the firmware. It means that unpredicatble things may have been done to any digital camera, and to be honest to some extent it puts me off buying bodies second hand. But it isn't hacking! When the camera starts up it reads the SD card, a...
Posted by karma mechanic on 20/07/2011 - 20:26
Lens Fine Tune Adjustment
Hi all. Sorry to stir up a hornets nest, re hacking software or not etc. All I was trying to do, was to thank everyone, for their input re the K10 lens focus adjustment, and to point out that not all of us have computer skills. I was an Industrial Electrical Engineer, (now retired), when it ...
Posted by ChrisR on 21/07/2011 - 11:53
Lens Fine Tune Adjustment
I have never fiddled with this either. What is the best way to test the lens? I am assuming Live View would work best? Am I right in presuming it's only neccessary on AF lenses? Where is debug mode in the menu? Is it the same as the AF Fine Adjustment setting? Aplogies for all the questions,I have p...
Posted by aliengrove on 21/07/2011 - 20:52
Lens Fine Tune Adjustment
AF fine adjustment is the menu you need. On yours it allows a different adjustment for each lens, while on older models it is a one-size-fits-all adjustment. On a camera body with Live View (which we can take to be perfect for this purpose) then do the following: 1. On a tripod, use LV to foc...
Posted by karma mechanic on 21/07/2011 - 21:03
Lens Fine Tune Adjustment
What is the best way to test the lens? There are charts for that for a simple test though you can use the newspaper for example, focus on a letter or piece of text and you'll see fast enough if the focus is spot on or not. II am assuming Live View would work best? Live view focus in a different w...
Posted by Anvh on 21/07/2011 - 21:07
Lens Fine Tune Adjustment
Thanks Km and Stefan, I will give this a try. I am pretty sure a couple of my lenses are out, especially the 10-20. Just one more question. Once done the normal AF can be set to match the Live View AF and you have exact focus. How do you set it once you've worked out how much it is out?
Posted by aliengrove on 21/07/2011 - 21:22
Lens Fine Tune Adjustment
How do you set it once you've worked out how much it is out? Which camera do you've? Only with the K20D, K7 and the K5 you can fine tune per lens with the other cameras you'll need to use the debug menu and with that you cna only fine tune the AF sensor meaning it will effect the AF for all lenses...
Posted by Anvh on 21/07/2011 - 21:27
Lens Fine Tune Adjustment
Chris - not everyone on here is au fait with computer stuff. But they do know how to follow in the footsteps of others. If someone says 'I didn't understand it at first, but I did this and it worked' then would you do the same thing? What I'm saying is if you want to follow some very precise ins...
Posted by ChrisR on 22/07/2011 - 20:24
Lens Fine Tune Adjustment
snips... 1. On a tripod, use LV to focus on a specific clear object a few metres away. Like a poster on the wall. 2. Once focussed, place a mark on the focussing ring (or on a piece of masking tape on the ring) to show where the exact point of focus is in relation to the centre line. 3. D...
Posted by OldTaffy on 26/07/2011 - 17:34
Lens Fine Tune Adjustment
2. Once focussed, place a mark on the focussing ring (or on a piece of masking tape on the ring) to show where the exact point of focus is in relation to the centre line. Sadly most modern lenses have some play on the focus ring :(
Posted by Anvh on 26/07/2011 - 18:20
Lens Fine Tune Adjustment
Sadly most modern lenses have some play on the focus ring :( Agreed, but that's the reason for the defocussing in between tests. It ensures that it arrives at the focus point from the same direction every time, thus minimising backlash. If the position of the ring disagrees consistently between ...
Posted by karma mechanic on 26/07/2011 - 20:50
Lens Fine Tune Adjustment
I don't know.. i simply use the image to see how it focused. The digital preview zoomed in worked well for me. Besides that with some pentax lenses the focus ring doesn't turn when you manual focus, like 3 i've...
Posted by Anvh on 26/07/2011 - 21:31
photography course
well i decided to go for it and see where it takes me back to school lol
Posted by cyberspider on 21/07/2011 - 16:37
