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01-29-2011, 02:03 PM   #1
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hyperfocus question

This may seem like a dumb question for most of you guys, but I am a little stumped.

I know how to hyperfocus with the Pentax 645 primes, but the zooms are confusing me. The lens I really want to do this with is the fa 45-85. Can someone please explain to me how to read the scales?

01-30-2011, 10:05 AM   #2
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Shuttershane,
there are no scales to calculate hyperfocal zone on the 45-85. A different scale is needed for every focal lenght, and it would be impossible or higly impractical from a mechanic point of view to print them on the barrel or provide a way to modify the scales for every focal.
Leica found a way to print scales for different focal lenghts on the tri elmar 28-35-50
Sergio
01-30-2011, 11:29 AM   #3
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So the markings on the lens mean nothing?
01-30-2011, 12:25 PM   #4
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infrared compensation for infrared filters

01-30-2011, 03:11 PM   #5
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I have added hyperfocal distances to both my zooms for my 6x7. The lenses are the 55-100 and 90-180. An example of what I have done is as follows: For the 55-100 zoom, I put a colored dot next to each focal length on the barrel (55mm, 75mm & 100mm; pink, red and green). The hyperfocal distance for each focal length at f/11 and f/32 were added to the barrel, based on prime lens DOF scales. If you don't use stops like I have added, put hyperfocal dots on yours to match how you shoot.
01-30-2011, 03:47 PM   #6
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Desertscape
That's a great idea, would you mind posting some pics of this?
01-30-2011, 05:44 PM   #7
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You can see what I'm talking about by going to the Lens Reviews within this forum under 6x7 lenses and looking at the two zooms listed. The 90-180 is probably the best one to look at since the 55-100 is a bit cluttered with more than just the hyperfocal dots. Remember that all dots for the same focal length should be the same color regardless of f-stop represented. I suggest putting the hyperfocal dots on the barrel with colored tape at first because you will have to test your focus distances in actual practice to verify their validity. This may cause you to move the dots and with tape, it is no problem. Finalize with paint dots later.

Good luck,
Steve
01-30-2011, 06:52 PM   #8
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I was under the impression that even with the primes on a 645d the marks are all wrong
Every time I try to do hyper focal on my 120' 150' or. 200mm lenses at f13 my images are always out of focus

01-31-2011, 02:27 PM   #9
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Kuau, using 645 primes on a 645d should not make much of a difference in DOF perception, however the difference of sensor VS film may make DOF errors more apparant with the 645d. DOF scale accuracy on Pentax MF lenses vary. They are almost always in error by being too optimistic. The shooter must adjust to compensate.
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