need help wit h focusing
Sep 8, 2011 14:59:10 #
the smallest fstop i have on any of my lens is 2.8 - so i will try doing as you say - i just never heard of setting the lens to infinity before - but dont usually put the lens on manual either.
Sep 8, 2011 15:03:08 #
thanks ronald - i am going to get this down one way or another - yes, it was plenty bright and the fstop was f5 so i will try a similar set up again - think that was one of the problems and as jim mentioned i also was using a focal point that was for a very narrow depth of field so the two things together - i have much experimenting to do this weekend and lots to keep trying to learn - thanks for the encouragement!
Sep 8, 2011 17:19:50 #
RonaldLewis
Loc: Chicago, Illinois
If it was plenty bright go with the largest number F 16, 22 that you can at ISO 400 and see what shutter speed you get. Try to get at least 1/60th. The larger the number the smaller the aperture (F-stop). After you take the picture look on your LCD and blow the picture up so you can see how sharp the people in the back rows are.
Sep 8, 2011 17:58:28 #
debbiesweds wrote:
Would like some help with this - dont have the pic... (show quote)
Before I say anything, post a photo with EXIF data for your topic of concern. that will narrow comments down to a exact point of reference.
Sep 8, 2011 20:52:32 #
Hope you will all will humor an old man. The bigger # does not coraspond with a smaller apature it just looks like it.F-stop is the measurement of this opening, expressed as the focal length of the lens divided by the diameter of the aperture. This makes it a fraction. So f16 is really f1/16 which is a smaller stop than f/8 which is f1/8. Ansil Adams and many other photographers noted the stop as F/8. Lens makers standardized the markings for the apature to 1.4, 2, 2.8, 4, etc to f/16 or even down to f/128 on large veiw camera lenses. These stops made it easy to double the exposure time if you stopped down a stop or cut it in half if you opened a stop. Since the new cameras set things for you they use what seems to be odd numbers like 9 or 13. Now so that everyone is in focus in the picture. Use a small f stop such as f/11 and focus on the person in the middle if your camera wont do it focus manualy. Dave
Sep 9, 2011 03:27:34 #
RonaldLewis
Loc: Chicago, Illinois
The numbers 9 and 13 are thirds of a stop. If you look in the numbers of your manual sometimes they will explain the stops in 1/3rds. They are 8, 9, 10, 11. Then you go to 11, 13, 14, and 16. I know this because I constantly set my exposure manually in 1/3rd of a stop. For critical exposure this is important.
Sep 9, 2011 08:55:16 #
Sep 9, 2011 12:40:44 #
wilsondl2 wrote:
So f/16 is really f1/16
No, I'm pretty sure it's just f/16, the "f" represents your focal length.... if your lens is 135mm, that would be 135/16, or an aperture width of ~8.4mm at f/16. Hope this helps.
Sep 9, 2011 13:25:49 #
OK I think Dave had said what I said long ago and as I look this up in my Canon manual It explains it well. Good luck in your shots.
Sep 9, 2011 15:04:04 #
jerm wrote:
No, I'm pretty sure it's just f/16, the "f" represents your focal length.... if your lens is 135mm, that would be 135/16, or an aperture width of ~8.4mm at f/16. Hope this helps.
wilsondl2 wrote:
So f/16 is really f1/16
No, I'm pretty sure it's just f/16, the "f" represents your focal length.... if your lens is 135mm, that would be 135/16, or an aperture width of ~8.4mm at f/16. Hope this helps.
From a mathematical point of view, you are both saying the same thing, just in different ways; f/16 would be equivalent to f(times)1/16. I believe the point you are both making is that the f/stop is a fraction, therefore the larger the number, the smaller the value, and the smaller the opening in the lens.
Sep 10, 2011 14:51:05 #
RonaldLewis
Loc: Chicago, Illinois
There is a article on this forum titled "A Tedious Explanation of F-stops" by Matthew Cole. I read it recently and learned a lot. He explains apertures and how F-stops are determined. He can explain this far better than I can. This is a must read for any new or old photographer. I knew how F-stops worked but had forgotten how they were determined. Please read this article several times and you will have a better grasp of what others have been saying on this forum. I say read this several times because it is fairly technical.
Sep 10, 2011 14:58:20 #
Yooper wrote:
From a mathematical point of view, you are both saying the same thing, just in different ways; f/16 would be equivalent to f(times)1/16.
jerm wrote:
No, I'm pretty sure it's just f/16, the "f" represents your focal length.... if your lens is 135mm, that would be 135/16, or an aperture width of ~8.4mm at f/16. Hope this helps.
wilsondl2 wrote:
So f/16 is really f1/16
No, I'm pretty sure it's just f/16, the "f" represents your focal length.... if your lens is 135mm, that would be 135/16, or an aperture width of ~8.4mm at f/16. Hope this helps.
From a mathematical point of view, you are both saying the same thing, just in different ways; f/16 would be equivalent to f(times)1/16.
Ahh, gotchya. Thanks for clearing that up.
Sep 10, 2011 18:21:25 #
jerm wrote:
Ahh, gotchya. Thanks for clearing that up.
Ahh, gotchya. Thanks for clearing that up.
You are welcome. I don't see any sense in arguing semantics, when there are so many more interesting things to argue about, like who has the best camera. Personally, I think the best camera is the one in your hand.
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