Search results for 'back focus' - page 1742
K5II - centre focus point - AF at f2.8 - What?
This is a link to the source of my confusion. Apologies; it's on another forum
Posted by JohnX on 26/04/2013 - 17:19
K5II - centre focus point - AF at f2.8 - What?
I think it's a DoF issue (the AF systems ability to accurately focus wide aperture lenses). IIRC in a lot of the pro Canikon bodies, many of the 'outer' AF areas are switched off when fitting some fast lenses as they're not sensitive enough to 'see through' the DoF of the wide-open lens. Otherwi...
Posted by johnha on 26/04/2013 - 20:50
K5II - centre focus point - AF at f2.8 - What?
JohnX, I'm as confused as you are! John K (Must be an issue only if your name's John :) ) Edit: I'd have thought more light / wider aperture, the better the AF functions. Further edit: Could it be too much light overpowers the sensor or whatever it uses to ascertain the focus point?
Posted by JAK on 27/04/2013 - 01:12
K5II - centre focus point - AF at f2.8 - What?
I'm confused as to what the question is, but this info may help. The AF sensor's f-stop rating has much to do with how far apart the 2 halves of it are spaced. A dim (i.e. small) lens will throw a narrow beam straight between these and miss them completely. A bright lens has a wide enough beam to...
Posted by sbrads on 27/04/2013 - 08:54
K5II - centre focus point - AF at f2.8 - What?
I saw a post elsewhere that commented on how the centre focus point of the K5II will work at f2.8, (in the horizontal plane), and that this was an improvement on the K5 et al I think that this is a reference to the aperture required at the lowest brightness figure quoted as being the autofocus opera...
Posted by andrewk on 27/04/2013 - 09:03
K5II - centre focus point - AF at f2.8 - What?
If the K-5II does contain f/2.8 high-precision AF points it should have been picked up by the reviews :shock: It is after all a major improvement.... maybe the trap in focus will work more accurately now :shock: I've not read them so I don't know. My 96 year old Aunt has been asking Pentax...
Posted by Algernon on 27/04/2013 - 09:48
K5II - centre focus point - AF at f2.8 - What?
[quote:3496ace15f="JohnX"]I guess folks can look up the corresponding figures in their K5 and K5II manuals. Out of curiosity, I did. The K-5 is EV-1 to 18, the K-5 II is EV-3 to 18, but I can find no reference to aperture that this refers to. All I know is that the K-5 II is awesome at focusin...
Posted by Mannesty on 27/04/2013 - 10:03
K5II - centre focus point - AF at f2.8 - What?
it should have been picked up by the reviews :shock: ' In a similar vein, I read that the sensor in the K5II is not the same as that in the K5, it having been redesigned - something to do with the size of the photo-sites? Only saw this once.
Posted by JohnX on 27/04/2013 - 13:50
K5II - centre focus point - AF at f2.8 - What?
http://www.pentax.co.uk/en/digital-slr/K5-II.html It actually states on the Pentax K5-II site...... SAFOX X can work with luminous flux based on F2.8 levels in addition to that of F5.6. This increase the AF accuracy drastically when using with very fast lenses. Strange that no one seems ...
Posted by Algernon on 27/04/2013 - 16:14
K5II - centre focus point - AF at f2.8 - What?
All I know is that the K-5 II is awesome at focusing in very low light with a f2.8 lens. did first wedding yesterday since moving to Pentax, K5II + 50-135 2.8 exceeded all expectations at the reception, focusing quick and spot on made me really chuffed I switched systems
Posted by strumstrum on 28/04/2013 - 10:14
K5II - centre focus point - AF at f2.8 - What?
it should have been picked up by the reviews :shock: ' In a similar vein, I read that the sensor in the K5II is not the same as that in the K5, it having been redesigned - something to do with the size of the photo-sites? Only saw this once. Where did you read this?
Posted by Smeggypants on 28/04/2013 - 20:58
K5II - centre focus point - AF at f2.8 - What?
[quote:3496ace15f="Algernon"]it should have been picked up by the reviews :shock: ' In a similar vein, I read that the sensor in the K5II is not the same as that in the K5, it having been redesigned - something to do with the size of the photo-sites? Only saw this once. Where did you read this?[/q...
Posted by cabstar on 28/04/2013 - 22:09
K5II - centre focus point - AF at f2.8 - What?
I have done extensive testing with the da 50mm 1.8 and the F 50 mm 1.4 and at wide open apertures the mkii is nearly always spot on with focus...
Posted by cabstar on 28/04/2013 - 22:10
K5II - centre focus point - AF at f2.8 - What?
[quote:3496ace15f="Algernon"]it should have been picked up by the reviews :shock: ' In a similar vein, I read that the sensor in the K5II is not the same as that in the K5, it having been redesigned - something to do with the size of the photo-sites? Only saw this once. Where did you read this?[/q...
Posted by JohnX on 28/04/2013 - 22:18
K5II - centre focus point - AF at f2.8 - What?
[quote:3496ace15f="JohnX"][quote:3496ace15f="Algernon"]it should have been picked up by the reviews :shock: ' In a similar vein, I read that the sensor in the K5II is not the same as that in the K5, it having been redesigned - something to do with the size of the photo-sites? Only saw this once. W...
Posted by Smeggypants on 28/04/2013 - 23:15
K5II - centre focus point - AF at f2.8 - What?
Shot a wedding today with Shaun Wilson and used the K-5iis and K-5 mk1. Used only two lenses, Sigma 105mm DG EX Macro and DA 17-70. The two lenses were interchanged between the cameras. In a nutshell, the K-5iis blew the K-5 completely out of the water, mainly due to the sublime focussing accur...
Posted by davidstorm on 28/04/2013 - 23:43
K5II - centre focus point - AF at f2.8 - What?
I shot a gig last night and left my k-5 mki at hone exactly because of the lack of focus accuracy. First gig I shot with one body in over 5 years. I wish the extra £100 trade in was on at srs as my order for a second mkii would be in..
Posted by cabstar on 29/04/2013 - 02:01
K5II - centre focus point - AF at f2.8 - What?
I wish I could justify trading my two K-5's up for a couple of K-5II's. I shall be holding out for the next model
Posted by Smeggypants on 29/04/2013 - 03:36
Micro AF Adjustment
Take a look at this thread Tim. Cheers David
Posted by davidstorm on 25/04/2013 - 21:29
AF Calibration charts
None. I did try some of them but it's quite simple just to aim at an angle on the back of a corn flakes pack or something with text on at max aperture and adjust until focus is correct. :)
Posted by Smeggypants on 25/04/2013 - 21:10
