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05-22-2011, 07:57 AM   #16
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As mentioned above, 15mm is fine... except in small rooms like baths, or in close old houses. I am currently renting an adobe casita (small house) in Santa Fe NM. Most rooms are quite small. 15mm is not sufficient. My Tamron 10-24 is barely sufficient. The DA10-17 is most encompassing, but distorted of course. Rooms 7x10ft / 2x3m and less are a real challenge, and that is a fact.

NOTE: The versions of the Sigma 10-20 get more love than the Tamron 10-24, although my Tammy is just fine in the margins. I've seen posts from users of both, complaining that they had to return multiple copies before getting a good model. So, copy (and quality control) variation seems to be significant with these ultrawides. This should be kept in mind by any prospective purchaser.

05-22-2011, 02:45 PM   #17
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QuoteOriginally posted by philippe Quote
Yes, to me the 15 mm is pretty much close to what the (my) eye sees under normal circumstances when observing a building/room.
FWIW, my perception is quite similar. It's hard to be precise about such things because our vision falls off gradually, not suddenly, and we're very good at "scanning" to take in more than our actual FOV. But I can say that when I mount my 18-55 at 18mm, I'm often struck by how much *doesn't* fit in that I would want to. When I mount a friend's DA14, I am struck by how much extra fits in that I don't want. The DA15 eels very "natural" to me.

That isn't to say it would always be wide enough for serious architectural photography, where you might want to fit in a whole room even though there's nothing particularly "natural" about doing so. But if you're going for a "natural" style, it could work. Still, if you're not sure, and really are serious about this, I'd go for the zoom, much as I love the DA15.
05-22-2011, 02:53 PM   #18
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QuoteOriginally posted by Marc Sabatella Quote
The DA15 eels very "natural" to me.
Totally agree. It's exactly what your eyes can see including all peripheral vision. The DA 21 is the FOV of everything you can *pay attention to* at once, and then the 40/70 are about picking out details.

However, the 15 falls flat if you want an unnatural FOV, which can sometime be very desirable (or simply necessary, in a cramped room).
05-23-2011, 12:33 AM   #19
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It really depends on what you are going to use the shots for ... if it is for selling / advertising / promoting a property then clients usually want to see the whole room in one shot (in fact I'm now assessing software for 360 shots and many companies are now turning to 3D walk-throughs, which are awesome when done right).

Therefore a 10-20 that shows the whole room in one shot is, IMO, infinitely preferable to two shots from a 15mm because one can't encapsulate the whole room e.g. a large lounge / kitchen, or isn't wide enough to cover a tiny room.

If they are for artistic purposes then that maybe another matter.

05-23-2011, 01:16 AM   #20
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QuoteOriginally posted by Frogfish Quote
Therefore a 10-20 that shows the whole room in one shot is, IMO, infinitely preferable to two shots from a 15mm...
I totally agree. A room might even be best shot with a fisheye to grab its totality, then the image de-fished and down-sampled, if a rectilinear ultrawide isn't wide enough. If that kind of distortion is intolerable, and if the shoot is under controlled conditions, then a 28mm lens (minimum distortion) mounted vertically on a pano tripod head may be the best solution: stitch a 180-270 degree panorama.
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