jim_sabo Posted August 11, 1997 Share Posted August 11, 1997 When shooting with my 135 macro on the Pentax 67, the aperature goes from f22 to f32 with no 1/2 stop detent. This can be a problem when max dof is required, since the shutter only has full stop adjustments. I am considering using 1/2 and 1/3 stop neutral density filters to tweak the exposure. Has anyone used this technique or others they'd care to share info on? <p> Thanx, Jim. Link to comment Share on other sites More sharing options...
steve_bingham Posted August 11, 1997 Share Posted August 11, 1997 Jim, <p> I ran into this problem yesterday. I cheated. I used the closest full stop. Then I went to f22 and covered my ass. Please let me know if you can find the necessary ND filters. <p> Steve Bingham Link to comment Share on other sites More sharing options...
tim_brown Posted August 12, 1997 Share Posted August 12, 1997 Can't you set the diaphragm ring between detents? <p> I'm not familiar with this particular lens but I get consistent 1/2 stops on my various lenses this way. Link to comment Share on other sites More sharing options...
steve_bingham Posted August 13, 1997 Share Posted August 13, 1997 Going between detents is a good idea. However, there is very little space between f22 and f32. That's why there is no detent. I tried that and used the meter deflection in the viewfinder. It still made me nervous. The diaphragm ring really wants to drop into one or the other detents. It's not very cooperative. The vibration from the mirroe lock-up is enough to move it - and you would never know! Steve Link to comment Share on other sites More sharing options...
clive_bubley Posted August 14, 1997 Share Posted August 14, 1997 Jim, <p> Set the aperture between the f22 and f32 indents, you don't need to use ND filters! I've been using mine between indents for ages - no problems at all, even with thirds of a stop settings. If you are worried about possible vibrations from the mirror lock-up release, then set the aperture after you lock up the mirror. I trust you'll be using the camera on a tripod anyway, so there is no problem. <p> Clive Link to comment Share on other sites More sharing options...
steve_bingham Posted August 14, 1997 Share Posted August 14, 1997 Clive, How will you know it is a half stop without looking through the viewfinder? I guess rough guesses make me nervous. Perhaps by noting the amount of swing in the TTL meter you can guess a half stop. I can't even imagine a 1/3 stop!!! Maybe a rough 1/2 stop will have to do. Steve Link to comment Share on other sites More sharing options...
clive_bubley Posted August 16, 1997 Share Posted August 16, 1997 Steve, <p> You don't need to look through the viewfinder - look at the aperture ring on the lens! Plenty of room for thirds of a stop between the indents! Go for it - its only a roll of film! <p> Clive Link to comment Share on other sites More sharing options...
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