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06 July 2009 @ 09:54 pm
My New Toy, part 2  

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gomeza on July 7th, 2009 02:08 pm (UTC)
Aha! How far apart were those two poles? When I first got into photography, I was always a bit confused by how teles could compress depth of er, not field, but apparent distance. Neat stuff.
dd-bdd_b on July 7th, 2009 02:56 pm (UTC)
It's because they don't; the lens does not change the perspective (defined as the relative sizes and positions of the bits in the photo). A suitable crop from a 24mm lens will *exactly* match a shot from a 500mm lens. (Nitpick since I'm talking to fans -- except for grain issues, since one is enlarged more than the other.) Remember that standard counter mat that all camera stores had, showing a series of pictures from the same vantage point with a huge series of lenses? Like that; each is precisely a crop from the next wider lens.

It's the position that controls the perspective. If you can move back while keeping a consistent view of a foreground object against a background, do so, and you'll see how the foreground shrinks relative to the background as you move away (or grows as you move closer).
dd-bdd_b on July 7th, 2009 02:51 pm (UTC)
Amusingly enough, long mirror lenses came up on a Nikon digital mailing list I'm on; the moderator ran across a Kenko 800mm f/8 (in Japan) for about $400, and was wondering if it was of any interest. Nobody on the list had ever used it, but we found some stuff on Flickr, which to me was saying "pretty good" and to him was saying "definitely not good enough for me".

f/8 is no longer a slow lens out at 800mm (though admittedly a 2x on a 400/2.8 gets you a stop faster).
wcolsher on July 7th, 2009 04:26 pm (UTC)
All right. All this Nikon telephoto stuff... can't... resist... parental... urge...

Here's a link to some stuff about one of my son's sports shots:

http://live.psu.edu/story/39786
http://www.flickr.com/photos/29640020@N03/