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06-29-2012, 05:56 AM   #1
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If f22 or f32 isn't quite good enough...

Are there options of what Pentax owners can do if f22 or f32 isn't a small enough aperature??

06-29-2012, 06:09 AM   #2
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In what terms? DOF or Exposure?
06-29-2012, 06:10 AM   #3
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If it's still letting too much light in: Get an ND filter

If DoF isn't enough: Focus stack and stitch elements together in PP.
06-29-2012, 06:22 AM   #4
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I've been told that F64 or even F128 lens and/or filters do exist, but... At that aperature they would not even need really great optics.

06-29-2012, 06:36 AM   #5
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QuoteOriginally posted by Medium FormatPro Quote
I've been told that F64 or even F128 lens and/or filters do exist, but... At that aperature they would not even need really great optics.
At that aperture, you wouldn't need optics. Just a hole in your body cap.
06-29-2012, 07:00 AM   #6
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Try a pinhole lens. But at that aperture the IQ will be pretty low. I can't really imagine a scenario where f22 wouldn't be enough, though. Especially with crop sensors.
Are you talking about macro? Because in macro people usually do focus stacking (which can also introduce all sorts of mistakes and oddities, but hey, it solves the DoF problem)
06-29-2012, 07:01 AM   #7
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QuoteOriginally posted by Eulogy Quote
At that aperture, you wouldn't need optics. Just a hole in your body cap.
Indeed diffraction will already be all over the place anyway.

Since the OP isn't giving as any information its quite pointless to discuss this further until we know more.
06-29-2012, 07:19 AM   #8
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Maybe OP just wants to be in the f64 club
Also, as mentioned, if you want long exposures it is better to use an ND filter than to use tiny apertures.

06-29-2012, 07:21 AM   #9
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If you find yourself in that neighborhood often invest in some ND filters.
With most lenses it's better to work closer to middle apertures, with or without filters.

Chris
06-29-2012, 07:29 AM   #10
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For macro I could understand why you may want it (though the dof gain will be badly offset by sharpness loss) focus stacking seems to be the popular solution (and some people do a fantastic job of it)
For shooting other than macro though (ie landscapes) i can't see much need for more than f22 from a dof standpoint on apsc (maybe 32) light may require it but that is what ND filters are for.
Medium format of course you see F32 commonly and even F64 occasionally because the format may need it for a landscape (large format lenses that go to F128 are about as well) a Tinkerer like Rio Rico would like just use a 80-100 year old large format lens adapted through mad scientist wizardry
06-29-2012, 07:30 AM   #11
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QuoteOriginally posted by Medium FormatPro Quote
I've been told that F64 or even F128 lens and/or filters do exist, but... At that aperature they would not even need really great optics.
Really? Any examples? Not that I need such a lens, but I'm always interested in the "oddballs".
06-29-2012, 07:36 AM   #12
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QuoteOriginally posted by Clavius Quote
Really? Any examples? Not that I need such a lens, but I'm always interested in the "oddballs".
look at large format lenses, quite a number have that kind of F stop. Only place i think you would want it would be large format. aon apsc beyond F22 will have too much diffraction, on ff f 32 may be acceptable (it is on my 645)
It would be a good reson to get a Tilt shit setup allowing you to capture the deepest DOF with the least diffraction.
Unfortunately T/S lenses are pretty rare
06-29-2012, 08:38 AM   #13
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Also, on a more trivial note, I believe the kit 18-55 lens goes at leat to f/44 when zoomed at 55mm. Too lazy to check the exact value now... But it is probably also applicable to other variable aperture consumer zooms.
06-29-2012, 10:41 AM   #14
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QuoteOriginally posted by Medium FormatPro Quote
I've been told that F64 or even F128 lens and/or filters do exist





Even RioRico would have a challenge adapting this to Pentax!

Last edited by lytrytyr; 06-29-2012 at 10:47 AM.
06-29-2012, 10:47 AM   #15
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Actually yeah I've got an old autographic that goes to f/128.
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