All Forum Comments
The point is that you adjust so that your eye is naturally focused upon the focusing screen, without strain. Only then can you easily manual focus without your eye wandering and causing errors.
Comment by johnriley posted on Do MF lenses need AF adjustment? at 11/01/2011 - 20:11
Don wrote:
We had this argument over video d-slrs not too long ago...
adding video won't hurt image quality... k10 vs k5... think about it...
ccd and cmos are both used for video sensors in pro video cameras....
heat and other issues can be addressed... what would be needed is the computing power of the k5 x two cores which could be done and combined with dual card slots and faster af to increase the 645's burst rate to match the k5's current abilities... now sensor size... use pixel doubling (or quadrupling) to get 1080 p with ultra low light video capabilities, and also release a (2 lenses in one) 3-d lens ( each lens using one half the big sensor) to record simultaneous 1080p video streams ( you lose some low light performance) and you'd have the highest resolution 3-d on the prosumer market...
all without sacrificing still image quality....
Piece of cake.....We had this argument over video d-slrs not too long ago...
adding video won't hurt image quality... k10 vs k5... think about it...
ccd and cmos are both used for video sensors in pro video cameras....
heat and other issues can be addressed... what would be needed is the computing power of the k5 x two cores which could be done and combined with dual card slots and faster af to increase the 645's burst rate to match the k5's current abilities... now sensor size... use pixel doubling (or quadrupling) to get 1080 p with ultra low light video capabilities, and also release a (2 lenses in one) 3-d lens ( each lens using one half the big sensor) to record simultaneous 1080p video streams ( you lose some low light performance) and you'd have the highest resolution 3-d on the prosumer market...
all without sacrificing still image quality....
You're a determined fellow Algi.
If users want to put in cut down Canon and Nikon screens I can't imagine why as they are out of spec. The positioning, thickness, etc. of a screen is critical.
If you are looking at a "sharp" image of something and the etched lines are not also sharp, you are out of focus.
However, some will remain determined to use DIY solutions, although for precision devices like a camera I feel it's most unwise.
If users want to put in cut down Canon and Nikon screens I can't imagine why as they are out of spec. The positioning, thickness, etc. of a screen is critical.
If you are looking at a "sharp" image of something and the etched lines are not also sharp, you are out of focus.
However, some will remain determined to use DIY solutions, although for precision devices like a camera I feel it's most unwise.
Comment by johnriley posted on Do MF lenses need AF adjustment? at 11/01/2011 - 17:32
Quote:
It should be possible then, using a lined screen, to get an in focus image in the VF, and the focus lines on the screen out of focus.
What happens is that your eye wants to see the subject matter in focus and it adapts so that you can. But the image you want your eye to rest easily on is the focusing surface of the ground glass screen.It should be possible then, using a lined screen, to get an in focus image in the VF, and the focus lines on the screen out of focus.
For the same adaptive reason you can't use an aerial image to focus.
Comment by johnriley posted on Do MF lenses need AF adjustment? at 11/01/2011 - 15:22
You can lead a horse to water....etc.
Comment by johnriley posted on Do MF lenses need AF adjustment? at 11/01/2011 - 14:57
Unfortunately Algi you're missing the point. If you focus on an image to set the dioptre then the eye adapts as you're doing it and the result is variable. The correct technique, as I've outlined and as per the manual, can make a huge difference.
Trust me, you only need to set it up once and then your MF will be spot on. If you can't see the point of sharp focus on the etched lines, then I think manual focus is not going to be effective for you and AF may be better option.
Trust me, you only need to set it up once and then your MF will be spot on. If you can't see the point of sharp focus on the etched lines, then I think manual focus is not going to be effective for you and AF may be better option.
Comment by johnriley posted on Do MF lenses need AF adjustment? at 11/01/2011 - 13:38
I thought the review was good, but maybe a bit devoid of any real emotion. No passion!
The comparison you mention does seem a little adrift from reality. The K-5 is superbly made ans stands amongst the best IMHO.
The only thing that tempts me to spend more money is the 645D.
You should pop over here more often!
The comparison you mention does seem a little adrift from reality. The K-5 is superbly made ans stands amongst the best IMHO.
The only thing that tempts me to spend more money is the 645D.
You should pop over here more often!
Comment by johnriley posted on Please Pentax, Pleeease! at 11/01/2011 - 12:32
Algernon wrote:
To set the dioptre I AF on to say a box that has lettering on it and then adjust the dioptre so that I can easily read the lettering on the box. This way even if the screen has excessive shims WYSIWYG
Not the right way to do it Algi, the last thing you want is an in-focus image. When you set the dioptre on the eyepiece you want to be focusing your eye on the etched lines on the focusing screen,To set the dioptre I AF on to say a box that has lettering on it and then adjust the dioptre so that I can easily read the lettering on the box. This way even if the screen has excessive shims WYSIWYG
Point the camera at a blank wall or sky, defocus if necessary, or even use no lens at all, adjust the setting until all the viewfinder etched lines are as crisp as possible. Now your eye focuses naturally on the ground glass screen and yo0u will be able to judge when an image is in focus.
Comment by johnriley posted on Do MF lenses need AF adjustment? at 11/01/2011 - 11:40
Welcome Maria.
There's certainly nothing wrong with enjoying taking photos without all the depth of technical skill that some have. If you have an eye for a picture, you'll produce good pictures. You're certainly in a great part of the country to have lots of exciting things to shoot.
Please do comment, all contributions are most welcome!
There's certainly nothing wrong with enjoying taking photos without all the depth of technical skill that some have. If you have an eye for a picture, you'll produce good pictures. You're certainly in a great part of the country to have lots of exciting things to shoot.
Please do comment, all contributions are most welcome!
Comment by johnriley posted on Just like to say hello at 10/01/2011 - 22:41
