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12-23-2009, 05:49 PM   #1
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question about F number

Hi everyone,
I realize that my K-7 and 50-200mm lens dont have F8 and F9 and F0. I figure it out but I cant find setting or something. do you know about it? I looked Pentax Photo Gallery and saw one picture same my camera and lens it say F9. Can you tell me how to setting or something custom ..... Thanks.

12-23-2009, 06:02 PM   #2
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The aperture setting when using the DA lenses, you change in the camera.
You have to use "Av" or "Manual mode" then change/operate the aperture with the front/back wheel.
If you want to change the shutter speed, you have to use "Tv" or "Manual mode" and change it via the front/back wheel.
12-23-2009, 06:21 PM   #3
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QuoteOriginally posted by Danny Delcambre Quote
Hi everyone,
I realize that my K-7 and 50-200mm lens dont have F8 and F9 and F0. I figure it out but I cant find setting or something. do you know about it? I looked Pentax Photo Gallery and saw one picture same my camera and lens it say F9. Can you tell me how to setting or something custom ..... Thanks.
The F9 probably comes of either setting the camera to using 1/3 stop increments, or that's what came up in EXIF on an auto mode. F8 should appear in your finder when you set there, whatever you do, and there'll be no real F0 (If you saw that, it probably means a lens the body couldn't read aperture data from)
12-24-2009, 08:31 AM   #4
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You see F9.... No Idea....

https://www.pentaxforums.com/forums/attachment.php?attachmentid=50137&stc=1&d=1261668207


Last edited by Danny Delcambre; 06-02-2010 at 09:40 AM.
12-24-2009, 08:37 AM   #5
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I realize that 50-200mm have WR... have f9 than my old lens....
12-24-2009, 02:10 PM   #6
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QuoteOriginally posted by Danny Delcambre Quote
I realize that 50-200mm have WR... have f9 than my old lens....
It has nothing to do with WR, that's just weather-sealing.

'F9' is just a place between the 'full stops' F8 and F11.

There are different increments between these stops: you can choose to a degree on some cameras, and often the aperture is actually 'stepless.' In either event, the computer programs which provide this information may approximate, whatever your camera may be telling you in the viewfinder.

Is there a particular problem you're encountering regarding all this? F numbers simply represent a ratio: you may perhaps see F9 or, say, F9.5 in the finder: the difference between these is in practice very small. Smaller than most photographers actually worry about in practice.

I'm guessing that what you'd like to know, really, is what the F-numbers really mean. ie, "What is an F-stop."

Getting warmer?
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