Search results for 'back focus' - page 1718
Focusing manual lenses on K5?
Using simple language, people who have used special focusing screen like the Canon EES report that the out of focus blur seen through the VF is 'blurrier' than with the stock screen, making it easier to determine what is in focus. Comparing what you see with the stock screen, and the resulting pictu...
Posted by Pentaxophile on 08/12/2012 - 07:29
Focusing manual lenses on K5?
I think it's worth practising using our eyes - such a simple thing that seems to have become lost..... ........... The acutance of different eyesight may be a relevant factor. Tests revealed that the point of focus chosen by an individual widely varied anyway. AF is probably more accurate. Confl...
Posted by Blythman on 08/12/2012 - 08:00
Focusing manual lenses on K5?
I think it's worth practising using our eyes - such a simple thing that seems to have become lost. To do this, we need to make sure that the dioptre setting is correct for our eyesight or, for cameras with no adjustment, that we have the right glasses on to ensure easy, relaxed eyes that can focus o...
Posted by Simonmac on 08/12/2012 - 08:34
Focusing manual lenses on K5?
From what I have seen, I don't think shooting manual lenses at below f2 is something you prioritise in your photography John, so perhaps you just aren't seeing the issue. You only see a portion of my photography on the web, so hard to say really. Conflicting and confusing John? More an abbreviati...
Posted by johnriley on 08/12/2012 - 08:49
Focusing manual lenses on K5?
Using simple language, people who have used special focusing screen like the Canon EES report that the out of focus blur seen through the VF is 'blurrier' than with the stock screen, making it easier to determine what is in focus. Comparing what you see with the stock screen, and the resulting pictu...
Posted by kh1234567890 on 08/12/2012 - 10:16
Focusing manual lenses on K5?
You keep saying this Smeggypants, but what it means is a bit obscure. It is true that some focusing screens are designed for wider aperture lenses, but even so there's no problem focusing an f/1.4 lens. I really couldn't comment on f/1.2 lenses, only to say that writers who have reviewed them did...
Posted by Smeggypants on 08/12/2012 - 10:59
Focusing manual lenses on K5?
This seems to me to be a totally different subject, there is no DOF at the focusing screen anyway. The DOF is in the subject and the screen is merely where the lens projects its image. It's not generally relevant anyway to modern AF lenses in general use, and probably only serves to confuse. DOF ...
Posted by kh1234567890 on 08/12/2012 - 13:50
Focusing manual lenses on K5?
That makes good sense. Isn't it something to do with the angle of the etching of the grain structure? I wonder if the depth of focus (that is, relating to the accuracy with which the screen position is placed) is small enough to make it an issue. Yet another potential source of error.
Posted by johnriley on 08/12/2012 - 13:55
Focusing manual lenses on K5?
That makes good sense. Isn't it something to do with the angle of the etching of the grain structure? I gather that it is a lot to do with the size and roundness of the individual 'grains' I wonder if the depth of focus (that is, relating to the accuracy with which the screen position is placed) is...
Posted by kh1234567890 on 08/12/2012 - 14:08
Focusing manual lenses on K5?
All you have to do is put on an 1.4 or 1.2 lens and note the DOF you see in the viewfinder. Then take a picture and note the much narrower and accurate DOF. I would suggest that what you are describing here is the impossibility of judging DOF on a tiny focusing screen. Obviously the more you enlarge...
Posted by Smeggypants on 08/12/2012 - 21:48
Focusing manual lenses on K5?
DOF is probably a bit of a misnomer with focusing screens. What really matters is the range of focus which will give visually perceived equally sharp VF image. That depends very much on the microstructure of the particular focus screen surface. With the Canon EE-s this range is much narrower than wi...
Posted by Smeggypants on 08/12/2012 - 21:53
Focusing manual lenses on K5?
DOF is probably a bit of a misnomer with focusing screens. What really matters is the range of focus which will give visually perceived equally sharp VF image. That depends very much on the microstructure of the particular focus screen surface. With the Canon EE-s this range is much narrower than wi...
Posted by kh1234567890 on 08/12/2012 - 22:34
Focusing manual lenses on K5?
Smeggy what are you saying? Please just humour me and clarify. Are you saying that "we" cannot accurately focus manual lenses on pentax DSLR's with the standard screen below f2.0?? thanks for helping with my increasing confusion on the subject:?:cry: Daniel
Posted by DanielH on 08/12/2012 - 22:48
Focusing manual lenses on K5?
[quote:3496ace15f="kh1234567890"]DOF is probably a bit of a misnomer with focusing screens. What really matters is the range of focus which will give visually perceived equally sharp VF image. That depends very much on the microstructure of the particular focus screen surface. With the Canon EE-s th...
Posted by Smeggypants on 09/12/2012 - 00:17
Focusing manual lenses on K5?
Smeggy what are you saying? Please just humour me and clarify. Are you saying that "we" cannot accurately focus manual lenses on pentax DSLR's with the standard screen below f2.0?? thanks for helping with my increasing confusion on the subject:?:cry: Daniel I'm saying it's a lot more difficul...
Posted by Smeggypants on 09/12/2012 - 00:21
Focusing manual lenses on K5?
I've just been getting some stick off a friend who uses a Canon he stumbled across this thread when searching for some Canon screens. He finds it very funny that some people on here can't even focus their cameras and that some people including a mod wouldn't be able to pass a beginners exam :sho...
Posted by Algernon on 09/12/2012 - 14:52
Focusing manual lenses on K5?
Just going to put my two pennies worth in here , i shoot manual lenses 70% of the time using the camera stock screen , I'm always thinking about replacing the focus screen , but as yet i haven't, this is probably because i can manage ok without doing this , focusing is like anything else practice ! ...
Posted by Mal on 09/12/2012 - 16:36
Focusing manual lenses on K5?
As for the focus screen being too dark to focus when the aperture is closed say at f12 , i just focus at f5.6 then close the aperture to f12 or what ever and take the shot. Which is exactly what SLR cameras do. We focus at open aperture and when we take the picture it momentarily stops down to work...
Posted by johnriley on 09/12/2012 - 16:52
Focusing manual lenses on K5?
I've just been getting some stick off a friend who uses a Canon he stumbled across this thread when searching for some Canon screens. He finds it very funny that some people on here can't even focus their cameras and that some people including a mod wouldn't be able to pass a beginners exam :sho...
Posted by Smeggypants on 09/12/2012 - 16:58
Focusing manual lenses on K5?
Just carried out the adjustment on my Pentax-A 50mm f/2.8 Macro at f/2.8.... It was the same as the 50mm f/1.7 at -5 Checked it for CIF MOVING IN SLOWLY and it's SPOT-ON! :wink: Cropped shot. No PP from JPG. It's better with any flat test target to make a 45deg paper box and put a bl...
Posted by Algernon on 09/12/2012 - 17:25
