Search results for 'back focus' - page 1620
Kr - AF Fine Adjustment
I have a "perfect-pixs" focus chart. So far only tried it under tungsten light. A bit useless. On the Pentax 55-300, it works really well at the 300mm. The focus is spot on with the depth of field extending on both sides about the same distance. On my Pentax 35-80, it works really well at the 80mm a...
Posted by surfseen on 29/07/2011 - 12:03
Kr - AF Fine Adjustment
I think if you set it to focus at 55 you might lose the sharpness at 300 and I would wager you will use the long end of the lens way more than the short as 55 is covered elswhere. Just my thoughts. Steve
Posted by SteveEveritt on 29/07/2011 - 18:10
Kr - AF Fine Adjustment
I thought the 55-300 would be a versatile lens. But if I have focus issues at 55. The lens effectively is probably a 150-300.
Posted by surfseen on 29/07/2011 - 22:40
Kr - AF Fine Adjustment
Tested the KR outside with some focus tests, using a row of bottles. There are still some issues with (let me get this the right way around)the Kr focussing at a spot in front of the centre. Is that ff or bf? But only with the zooms at the lowest zoom level. But perfectly acceptable. Wouldnt like...
Posted by surfseen on 31/07/2011 - 00:44
Kr - AF Fine Adjustment
Not knowing how you went about this, it strikes me that at the long end the camera has an easier job of focusing with the limited DOF available. At the wide end it's harder to find the point of focus. This is true for our eyes as well, when we manually focus. However, at the wider end the increas...
Posted by johnriley on 31/07/2011 - 08:31
Kr - AF Fine Adjustment
I have a KR with 10mm through to 300mm (15 to 450mm equiv) in my three lens kit. I use spot focus a lot with my telephoto and accept that you can only expect so much from autofocus when depth of field is shallow and it is so easy to mistakenly focus on a leaf or twig when trying to get a bird, bu...
Posted by wvbarnes on 31/07/2011 - 09:47
Kr - AF Fine Adjustment
I also note reading around other photography sites and mags that supposed focus AF inaccuracy is the new obsession. Isn't this in danger of becoming a little sad? It is indeed the current obsession. I find it hard to get excitred about it because I've not found a lens with a problem yet, and that co...
Posted by johnriley on 31/07/2011 - 10:09
Kr - AF Fine Adjustment
Manyfacturers have added this feature after it became obvious people were accessing the hidden menus anyway...so little development cost there. I thought Pentax brought it to the K20D because the higer end camera's from other brands also had it. First time hearing that we are to blame. About the...
Posted by Anvh on 31/07/2011 - 13:16
Kr - AF Fine Adjustment
As I recall Pentax were actually one of the first on this occasion, and the others soon followed. Just another feature to compete against each other with? Or a real problem finally addressed? :?: Now that high ISO noise seems to be tackled and pixels counts are about as high as needed or pract...
Posted by johnriley on 31/07/2011 - 13:24
Kr - AF Fine Adjustment
I definitely had a focussing issue on my K-X with DA L 55-300mm lens, so much so that I was on the point of returning the lens as I thought it may be faulty (very soft). Since adjusting the focus correction (hidden menu) to +50 this issue has gone away. Manual focus was never a problem, but to man...
Posted by davidstorm on 31/07/2011 - 16:08
Kr - AF Fine Adjustment
I think focus issues, have become more pronounced since digital, especially for a lot of amateurs. In the days of film, you didnt take as many photos, and it took time from the end of the roll to the finished picture. It was accepted that some didnt "turn out". Nowadays, your finished product flashe...
Posted by surfseen on 31/07/2011 - 23:45
Kr - AF Fine Adjustment
I'm amazed how few people mention using the quick focus ring over-ride on DA lenses or indeed simply switching to manual with difficult subjects. Standard focussing screens can't resolve DOFs narrower than what you'll get at f/2.0 Therefore it's nigh on impossible to accurately manual focus a len...
Posted by Smeggypants on 01/08/2011 - 03:23
Kr - AF Fine Adjustment
I also note reading around other photography sites and mags that supposed focus AF inaccuracy is the new obsession. Isn't this in danger of becoming a little sad? It is indeed the current obsession. I find it hard to get excitred about it because I've not found a lens with a problem yet, and that co...
Posted by Smeggypants on 01/08/2011 - 03:34
Kr - AF Fine Adjustment
Must say I agree with Smeggy here, and disagree with those who say AF adjustment isn't necessary. I recently got a Sigma 30mm f1/4 and from the very first shots I could see that the AF was off. All I did was casually shot a few frames of a magazine that was lying on the table, focussing on a drop c...
Posted by thoughton on 01/08/2011 - 14:07
Kr - AF Fine Adjustment
I forgot to say that 1/100 of a millimeter is the difference it makes at the sensor, quite stunning how much impact it can have and how precise everything must be. I've looked the numbers up when talking about medium format digital backs and arguing that the Pentax 645D can be make more precise t...
Posted by Anvh on 01/08/2011 - 14:23
Kr - AF Fine Adjustment
Must say I agree with Smeggy here, and disagree with those who say AF adjustment isn't necessary. I recently got a Sigma 30mm f1/4 and from the very first shots I could see that the AF was off. All I did was casually shot a few frames of a magazine that was lying on the table, focussing on a drop c...
Posted by Smeggypants on 01/08/2011 - 15:18
Kr - AF Fine Adjustment
I should check it out. I've been currently using live view to focus my 1.2 and 1.4 MF lenses, but that's not always a comfortable I presuming you need to shim the screen to calibrate it though and I'm not 100% sure how to get that accurate. I have previously shimmed a focus screen with slices of ...
Posted by thoughton on 01/08/2011 - 16:33
New Microsoft Codecs
Have had a look - seems interesting but not sure what to download and whether it will work. I have windows 7, 64 bit. Does anyone know which one I should download - if any!! Currently using DNG but would like to go back to PEF. Cheers John
Posted by Kenty on 29/07/2011 - 17:55
K7 to K5
This has probably been asked before but is it worth changing from a K7 to K5? ie is the frame rate and auto focus that much quicker and the ISO that much better at higher settings?Many thanks,:oops Peter
Posted by Trubshore on 01/08/2011 - 17:20
K7 to K5
I have gone straight from the k10 to k5, so no experience at all with the k7. I must say that the constant issues with speed of focus I have had in the past have ruined thousands of potentially good shots I have taken. With the new autofocus system in the k5 I shouldn't have these problems any more....
Posted by mattox on 03/08/2011 - 09:12
