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View Full Version : zoom length equals focus length?


Within
08-08-2005, 06:15 AM
From the many photographs which I have taken, often, at full zoom, the details in the image becomes blur, not pixelated or hand shake as I am using a tripod. Is there any reason behind this "mystery"?

Could it be due to the focus length or the zoom length? In conjunction to this, does zoom length have any relation to do with focus length and what does the digits in front of the word lens mean, e.g. 300mm lens?
Rex914
08-08-2005, 05:44 PM
It's likely that the camera is focusing on the wrong thing or it's not focusing at all.

What you are referring to is the minimum focus distance, something that only kicks in if you try focusing on really close objects. For a telephoto lens, this minimum distance is typically around the 1.5-3m range.
Within
08-21-2005, 12:50 AM
Sorry about my post, my real problem is the subject is too far away, so the 12x zoom is too little, making the subject out of focus. I suppose the only solution is a teleconverter.

Thanks anyway for your post.
John_Reed
08-21-2005, 09:39 AM
Sorry about my post, my real problem is the subject is too far away, so the 12x zoom is too little, making the subject out of focus. I suppose the only solution is a teleconverter.

Thanks anyway for your post.
I can't quite understand your statement. If your subject is out of focus, it isn't because it's "too far away," it's because it's out of focus! Here's a hand-held full-zoom shot I took with my FZ15 (+teleconverter), where I had to resort to "Manual" focus to get the bird to be the subject of focus amid the branches. Sometimes using AF for situations like this can lead to "out of focus" results, but it isn't because of subject distance.

http://John-Reed.smugmug.com/photos/19677807-M.jpg
tim11
08-21-2005, 06:07 PM
Within,
I have followed many of your posts mainly asking questions about pictures out of focus. A subject far away doesn't make it out of focus. You should still get a small but sharp picture. The only times they are out of focus, in my experience, it that evening light is too low.
My animal pics are all handheld - I just don't have the time to wait for them with a tripod set up. Every now and then I got a blurry one but I'm happy with most of them.
BTW - the pic attached was AF at 12xoptical zoom (no fit-in teleconverter), and not enhanced by software only to scale the pic down in size.