Search results for 'back focus' - page 1606
Returned K5 - Where to now?
Depth of field is dependent on exactly four parameters: the focal length, subject distance, aperture (F number) and the circle of confusion diameter. The first three are objective measures but the last is subjective, which makes sense when you consider how much something is out of focus is an indivi...
Posted by rparmar on 26/05/2011 - 03:45
Returned K5 - Where to now?
Depth of field is dependent on exactly four parameters: the focal length, subject distance, aperture (F number) and the circle of confusion diameter. The first three are objective measures but the last is subjective, which makes sense when you consider how much something is out of focus is an indivi...
Posted by Smeggypants on 26/05/2011 - 04:33
Returned K5 - Where to now?
The circle of confusion is a parameter that can be decided upon. Make your requirement for this smaller and you need a higher resolution lens. In general, smaller formats have a smaller circle of confusion to make a standard print, say 12" x 16", of the the same quality. This means that lenses fo...
Posted by johnriley on 26/05/2011 - 08:00
K10D 22Bit D/A vs K5's 14 bit
at the end of the day an extra 2 bits you keep are of far greater value than an extra 10 bits you throw away, regardless of what you use you make of them before ditching them. There is something else behind the reason to use a 22bit A/D converter, what you are comparing are two different things actu...
Posted by Anvh on 21/05/2011 - 22:24
K10D 22Bit D/A vs K5's 14 bit
you can see the trend if more gain was applied to the K10D sensor to give higher ISOs 1600 Will get back on that because i've read that the K10D couldn't make use of all the bits inside 12bit file and neither could the K20D, the K5 is probably the first Pentax camera that has the potential to use mo...
Posted by Anvh on 18/06/2011 - 21:48
K10 and DA 16-50 focus issue
I'm new to the forum and was wondering if anyone has experienced the same problem as me, I'm using a K10 with the smc DA* 16-50mm F2.8. I get focus lock using the centre point on what I want sharp and then recompose keeping the shutter button pressed half way down. But when I take the photo the ...
Posted by douglas1438 on 23/05/2011 - 09:58
K10 and DA 16-50 focus issue
Leaving aside the added complication of the recomposing, what happens if you get the focus lock hexagon and then simply take the shot - is the intended part of the subject in focus then?
Posted by karma mechanic on 23/05/2011 - 10:08
K10 and DA 16-50 focus issue
Not always, although I think it's more by luck. Tends to be worse at f2.8. Thanks, Chris
Posted by douglas1438 on 23/05/2011 - 11:00
K10 and DA 16-50 focus issue
Have you checked that AF is set to AF-S as opposed to AF-C?
Posted by Blythman on 23/05/2011 - 11:17
K10 and DA 16-50 focus issue
On the K10D it is possible to adjust the autofocus using the normal menus in debug mode, but it is a global setting that applies to all lenses. A lot depends on whether the 16-50 is alone in requiring adjustment or not. Having that lens calibrated by the service centre may be the proper solution, ...
Posted by karma mechanic on 23/05/2011 - 11:21
K10 and DA 16-50 focus issue
You would expect that focus is more critical with a wide open aperture, so that much is predictable. Are you able to estimate the distance back or forwards by which the focus is out? Not that the numbers are the issue, just the consistency. Is it only autofocus that is out (and not manual fo...
Posted by i-Berg on 23/05/2011 - 11:25
K10 and DA 16-50 focus issue
Thank you for all your advice. Ok, focus is fine in manual mode, also focus fine on my other lenses, including Tamron 70-200 f2.8 and Sigma 50mm f2.8. Also tried lens on a K5 body in camera shop and although not a scientific test appeared to be fine. As an aside when I tried to use the lens on...
Posted by douglas1438 on 23/05/2011 - 14:23
K10 and DA 16-50 focus issue
On the K10D it is possible to adjust the autofocus using the normal menus in debug mode, but it is a global setting that applies to all lenses. A lot depends on whether the 16-50 is alone in requiring adjustment or not. Having that lens calibrated by the service centre may be the proper solution, ...
Posted by Smeggypants on 23/05/2011 - 19:25
M42 Lens on K10D.
Any Information appreciated. I have a K10D, and would like to try a number of prime manual lens, from my Pentax film SLR, (M42), I already have the Pentax K mount to M42 adaptor. I know I will have to manually compensate for exposure as there will not be any feed back to the camera, as to apertur...
Posted by ChrisR on 23/05/2011 - 11:29
M42 Lens on K10D.
No, it will be fine. In fact the metal base of the lens is supposed to short out some of the contacts, if this doesn't happen you won't be able to enable 'catch-in-focus', among other things. Some M42 lenses have black painted bases (e.g. Takumars), you will need to either scrape a bit of the black ...
Posted by thoughton on 23/05/2011 - 12:06
Will I Love the K-5
I have a GX20 (K20D) and as per my other thread where I was mentioning that I had a wedding booked I have come to the stage where I need to get a second body rather quickly. My original intention was to get a K10D or a GX10 as a back up as that is all my immediate budget would allow. I have decided ...
Posted by Daydreamjay on 23/05/2011 - 19:46
Will I Love the K-5
Going from the K20 to the 5 isn't a huge leap. The basic controls are the same or similar. The general concensus is very positive. Low light performance is a big step up from the K20 and I think be a real plus for indoor shooting without flash (I'm no wedding photographer btw so we'll see if othe...
Posted by Sean282 on 23/05/2011 - 21:29
Will I Love the K-5
Going from the K20 to the 5 isn't a huge leap. I would disagree. :) I've found upgrading the K20D to the K-5 a huge leap in lot of respects, not least of which is the IQ. The AF is much faster, shutter is much quieter, the menu system is much easier to navigate ( and remembers the last page ). ...
Posted by Smeggypants on 23/05/2011 - 21:55
Will I Love the K-5
... how long are you going to wait? The answer to that question has to be, I don't know. K3, K1, who knows? I could live with one QC issue and buy when I was sure it was dealt with, but the K5 seems to suffer from so many seemingly unrelated problems in numerous users hands that I have no confide...
Posted by Mannesty on 24/05/2011 - 20:56
Will I Love the K-5
You mean at DeB? Let me know what they say Stefan. As I said elsewhere Chris at SRS was going to ask Pentax UK about it too, but I've not heard any more. Yep i mean them, i already sent them an email so we will see. I never had much luck with them responding back :roll: I'll call them the end of...
Posted by Anvh on 24/05/2011 - 21:08
