Search results for 'back focus' - page 1284
Issue regarding sharpness with the K10D
I had problems with some older Sigma lenses and the autofocus. Sharpness is very acceptable now after buying new pentax lenses. Havent yet tried to calibrate the autofocus, with the particular lense. I have got the focus card though. Probably sharpness is OK, or I would have taken the trouble to go ...
Posted by surfseen on 18/05/2011 - 04:54
K10D Stop down metering exposure problem
Hello All Although I must first state that I DO NOT yet own the K10D but I am an interested reader of this thread (and similar threads on different Forums) because one day I hope to upgrade from my *ist Ds. The only reason for me sticking my nose in here is that I have only seen mention of expo...
Posted by photo*ist on 20/02/2007 - 08:09
K10D Stop down metering exposure problem
...I preselect the aperature ring setting on the lens, then while holding the depth of field preview button I turn the thumbwheel to select the appropriate shutter speed. The exposure compensation reading in the viewfinder acts as an old fashioned "match-needle" indicator to set the correc...
Posted by justgetoutandride on 21/02/2007 - 16:57
K10D Stop down metering exposure problem
Are they widely apart or just a half stop or so? Was the camera on a tripod with a constant light source as the target and exactly the same field of view? I only ask because the slightest change in position with an average scene can cause differences in the exposure indicated. To be a proper ...
Posted by johnriley on 22/02/2007 - 08:03
K10D Stop down metering exposure problem
I did some tests today to try to see if there was any recogiseable pattern to the exposure problems people are having with using older lenses on the K10D. It was a beautiful morning with a clear blue sky and sunshine so the light was consistent during the time taken to do the tests. Camera sett...
Posted by boxcam78 on 08/03/2007 - 15:50
K10D Stop down metering exposure problem
As per my post on another question, has anyone tried this after upgrading to firmware 1.11? I'm planning to repeat my tests over the weekend with it; I'll report back.
Posted by ChrisA on 09/03/2007 - 07:23
K10D Stop down metering exposure problem
buris, good thought. However if my understanding of the K mount is correct it shouldn't matter. The original K mount works thusly As you look from the back of the lens, there is a small actuator on the right hand side which activates stop down. This is spring loaded so that it defaults to t...
Posted by Mongoose on 17/03/2007 - 11:09
K10D Stop down metering exposure problem
George Lazarette Many thanks for your clarification. I was confused having come back to Pentax after spendins 2 decades using professionsl medium format cameras, Gasselblad, Mamiya RB/Z67, even Kowa 6. My lens is certainly a K lens. Ron McDermott
Posted by photog 73 on 18/03/2007 - 02:32
K10D Stop down metering exposure problem
Thanks for the replies to my posting, there are however a few points Iwould like to point out. As I understand the point of having an A setting on the A-type lens is that it is possible, provided there is some kind of predictability in the relationship between the aperture actuator and the actual a...
Posted by Mongoose on 19/03/2007 - 16:20
K10D Stop down metering exposure problem
Depending on the lens, there is an active market on eBay for M and K series optics. Even more so when the lens is one of the rarer ones. A 20mm f4 will always do well, a 50mm f2 will sell but for a low price. Many of the more mundane A lenses sell for quite low prices - a 35-70mm f4 went recebtly...
Posted by johnriley on 20/03/2007 - 07:54
K10D Stop down metering exposure problem
Oh dear - I wish I had read this site properly a couple of weeks ago...... :x After waiting a long time for Pentax to bring out a digital camera even half as good as the LX I was delighted to see the recent very positive reviews of the K10D in Amateur Photographer & What Digital Camera. Here...
Posted by MDV on 21/03/2007 - 00:20
K10D Stop down metering exposure problem
I think this is to a large extent a moot point in that there is full compatibilty from the A series onwards. That dates back over 25 years, give or take, and I don't think we could really grumble too much at that. It's much better than Canon, perhaps on a par with Nikon and vastly better than Olympu...
Posted by johnriley on 21/03/2007 - 00:32
K10D Stop down metering exposure problem
I think this is to a large extent a moot point in that there is full compatibilty from the A series onwards. That dates back over 25 years, give or take, and I don't think we could really grumble too much at that. It's much better than Canon, perhaps on a par with Nikon and vastly better than Olympu...
Posted by MDV on 21/03/2007 - 17:56
K10D Stop down metering exposure problem
In short though - your K100D appears to function a lot better on this point....want to swap? I wouldn't go that far. :shock: Despite the annoyances with M series lenses, and A-lenses in non-A mode, I still don't regret buying the 10. My photographic mojo had completely evaporated after the sh...
Posted by ChrisA on 21/03/2007 - 22:39
In the move from film to digital ...
Hi, Yes, you now have effectively a 75mm lens, but it now also still has the 'larger' depth of field of the 50mm lens it still is...so if you like selective focus effects with wide apertures one of the downsides of digital is about to hit home.. cheers Steve.
Posted by bretbysteve on 14/02/2007 - 10:46
In the move from film to digital ...
but it now also still has the 'larger' depth of field of the 50mm lens it still is...so if you like selective focus effects with wide apertures one of the downsides of digital is about to hit home.. yes but you will have the same depth of field as a 50mm lens. This is more DOF than you would hav...
Posted by Reuben0 on 14/02/2007 - 12:39
In the move from film to digital ...
A 50mm lens is always a 50mm lens and always has the same DOF. If you change the parameters by deciding on a different circle of confusion, that's one thing, but you haven't changed the lens you've changed your parameters for assessing the lens. It's well established that in practical terms, f...
Posted by johnriley on 14/02/2007 - 15:00
In the move from film to digital ...
A 50mm lens is always a 50mm lens and always has the same DOF. John, I'm afraid that's not mathematically correct :-) There is no such thing as an absolute DOF value for any lens/format. It all depends on what "circle of Confusion" value you apply (which is a measure of how sharp the OO...
Posted by Reuben0 on 14/02/2007 - 16:39
In the move from film to digital ...
All I am saying is that a 50mm lens is a 50mm lens and it's characteristics do not change because of what we put behind it. That's true John, but DOF is a matter of perception rather than an intrinsic property of a lens. Let me explain why :-) When a lens is focussed at a particular distance, det...
Posted by Reuben0 on 15/02/2007 - 13:04
London Shots - K10D vs 120
A few weeks back I posted some of my first K10D shots from a trip into London - finally got round to posting the film efforts last week and got them back from processing today. What's interesting is that I can show you some comparision shots of the K10D vs 120 - decide for yourself if it's a fair...
Posted by spirit_of_will on 12/02/2007 - 21:50
