Search results for 'back focus' - page 1964
Shutter speeds/focal length/handheld
Yep, but bear in mind that I would still like to be able to crop and enlarge the negatives. I want to get the old enlarger back into action as early attempts to scan negatives proved tedious and unsatisfactory - the scanner just can't cope with the resolution needed if you then plan to enlarge the r...
Posted by Dangermouse on 13/03/2011 - 23:03
645 slide mounting
Hello All- I've recently built up a Pentax 645n kit, including a Kindermann 6 x 6 projector, and from Ebay a number of 6 x 45 slide mounts. These are made of a white bristol board or some such and seem to have a dry adhesive on the inside of the mount as they would fold up. Back in the day I c...
Posted by George in Georgia USA on 29/03/2011 - 18:27
Light meters
Most medium format cameras don't have any light meter built in as standard. Some system cameras (Hasselblads, Pentax 67's, etc) have seperate prism attachments that have light meters built into them, but these are optional extras. The Pentax 645 is one of a handful of MF cameras that has an integral...
Posted by hefty1 on 08/04/2011 - 14:24
Focussing a 55-100mm zoom on a P67ii body
Hi, I recently was fortunate enough to be able to pick up a 55-100mm Zoom lens for my Pentax 67 II camera. This is my first zoom lens for the camera and I'm very much looking forward to using it after hearing very positive things about its quality. Most of my photography with the Pentax 67ii i...
Posted by rickbehl on 06/06/2011 - 04:08
Focussing a 55-100mm zoom on a P67ii body
If you are maximising DOF the easy "rule of thumb" is simply to focus one third of the way into the scene. The scene is defined as the area containing the nearest and furthest objects that you want to be in focus. The DOF will be the same at any given focal length for both the prime lenses and th...
Posted by johnriley on 06/06/2011 - 06:52
Focussing a 55-100mm zoom on a P67ii body
John what is the full offical rule because you state two different things in your comments. -simply focus one third of the way into the scene- vs -using small apertures at moderate distances- I'm getting a bit lost :( ps. a more recent article about why the third rule doesn't work. htt...
Posted by Anvh on 22/07/2011 - 19:49
Focussing a 55-100mm zoom on a P67ii body
I'll start again from the beginning. This is a simple "rule of thumb" (approximation if you like) for getting as much of a scene in focus as possible. Set a small aperture (maybe f16, maybe f22) Focus on a point one third of the way in, between the point closest that you want in focus and the p...
Posted by johnriley on 22/07/2011 - 20:07
Focussing a 55-100mm zoom on a P67ii body
Thanks John for explaining This is a simple "rule of thumb" (approximation if you like) for getting as much of a scene in focus as possible. It's not even an approximation, just do the math with what you just said. You will need to try very hard to get an example where the rule will work. If ...
Posted by Anvh on 22/07/2011 - 20:32
Focussing a 55-100mm zoom on a P67ii body
The point is made that everything would be within the DOF. But how it is done is simply to crude, it's like trapping a mouse with an elephant trap... If it didn't work, then generations of photographers would have been wrong. It simply doesn't work, not even in general. The one third rule is b...
Posted by Anvh on 22/07/2011 - 21:33
Focussing a 55-100mm zoom on a P67ii body
Ah sorry, didn't read it well :oops: There is no rule of thumbs for focusing because there are to many variables. There is no way you can get focal length, aperture, focus distance, circle of confusion in an easy package. :( For most subjects you simply focus on the subject so there is no nee...
Posted by Anvh on 22/07/2011 - 22:10
Focussing a 55-100mm zoom on a P67ii body
Nobody needs to go to those lengths when there is a well established rule of thumb that works. I actually have a serious question about the rule. If i want for example 8 meters to infinite in focus, then at what distance should i focus? Call me stupid but i don't know what 1/3th of that is :(
Posted by Anvh on 22/07/2011 - 22:23
Focussing a 55-100mm zoom on a P67ii body
So you weren't serious before? If not, then you could be misleading those who are unsure, which is not useful. However, I'll assume it is a serious question and that you're using a 55mm lens. If you set it on f11 you could actually focus on infinity and DOF would stretch down to 8.44m but if you ...
Posted by johnriley on 22/07/2011 - 22:28
Focussing a 55-100mm zoom on a P67ii body
If i've read the article correctly, the third rule will result in too conservative (too close) a hyperfocal distance. However this is better than merely focussing on or near infinity, and definitely better than focussing too close. You're correct about the conservative at hyperfocal distance but tha...
Posted by Anvh on 22/07/2011 - 23:27
Focussing a 55-100mm zoom on a P67ii body
'What is 1/3 of infinity' - this is precisely why the rule is so conservative and errs heavily on the side of caution. It's for deep focus landscape shots. Who would ever use this for portraits? I'm usually more worried about too much dof there, not too little. In practice we can start with the ...
Posted by Pentaxophile on 22/07/2011 - 23:34
Focussing a 55-100mm zoom on a P67ii body
It's for deep focus landscape shots. Who would ever use this for portraits? I'm usually more worried about too much dof there, not too little. Same here for portraits so in those situation it's simply not needed. As for the landscapes 1/3th is simply too much. If you want a rule of thumb use th...
Posted by Anvh on 23/07/2011 - 17:30
Focussing a 55-100mm zoom on a P67ii body
Just thinking but couldn't the one third rule not come from the age when focusing was done by bellows on rails. I've not done the math but it could be that it will work very well for that, so it might work when you use 1/3th of the way of the focus scale instead of focusing in the scene. But sti...
Posted by Anvh on 23/07/2011 - 18:20
Focussing a 55-100mm zoom on a P67ii body
Interesting discussion. I do have to add that I have used the 1/3 rule of thumb for landscapes and so on with good results. I have never used it for any other type of photography. Anything depending on hyperfocal for focus is not critical anyway. Measured focus and dof tables will be better for crit...
Posted by BelowBiosphere on 11/06/2013 - 16:54
Focussing screen for the 645NII
In the end I decided not to buy a focusing screen but rely completely on the focus indicator of the camera's viewfinder instead. I focus on the area or subject I want to get in focus until the indicator lights up in the viewfinder and then compose the shot; not great for street photography although ...
Posted by hoshisato on 07/09/2012 - 21:32
645 pitfalls
I have just managed to get my grubby little mits on a Pentax 645 film camera with a 70mm lens and a 120 back for a couple of weeks, can anyone offer some advice as to the pitfalls and quirks of this camera.
Posted by Technoblurb on 20/11/2011 - 11:22
67II worth buying?
Once you put your eye in a medium format you won't go back For a complete 67II I would spend between 8 and 900£, a naked one in Ffordes for a good price to this one you need to add a viewfinder and a lens, the standard lens is the 105mm, it's easy to find good deals but some lenses are hard to ...
Posted by Grisha on 14/01/2012 - 19:38
