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04/26/2006 08:42:13 AM · #1 |
Hi all,
I have a canon 20d and want to know which lens will give the widest field of view, the 10-22mm or a 15mm fisheye. Barrel distortion not really and issue with me. Is there any way to get a true 180 degree fov with a 20d? |
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04/26/2006 08:45:24 AM · #2 |
10-22mm is the widest your going to get, a 15mm fisheye will be somewhere around 22mm,
im unsure if there are non canon lensed that go wider,
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04/26/2006 09:08:47 AM · #3 |
| If you don't mind fish then 8mm is the widest I know of. |
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04/26/2006 09:13:28 AM · #4 |
| Do you know if a 8mm fish on a 20d will leave the corners of the image black? |
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04/26/2006 09:19:26 AM · #5 |
Originally posted by Templeman:
Do you know if a 8mm fish on a 20d will leave the corners of the image black? |
No sorry - I don't own one so don't know how far the 20D will cut into the circle. Maybe checkout some of the examples in that link that were shot with a 20D (I know they might have cropped). |
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04/26/2006 09:22:33 AM · #6 |
Originally posted by TroyMosley:
10-22mm is the widest your going to get, a 15mm fisheye will be somewhere around 22mm,
im unsure if there are non canon lensed that go wider, |
a fisheye will be wider or just as wide. A 15 mm fisheye is wider than an 14 mm rectilinear. A fisheye is a 180% field of view.
the 8mm on a 20d will leave black corners, but its not too bad. that said, the optics on the 8mm lenses usually kinda suck and flare like crazy.
I would go with the 10-22 unless you dont mind some curved lines from the 15mm fish. |
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04/26/2006 09:32:32 AM · #7 |
Originally posted by petrakka:
a fisheye will be wider or just as wide. A 15 mm fisheye is wider than an 14 mm rectilinear. A fisheye is a 180% field of view. |
Canon's 15mm fish covers 180 degrees on a full frame sensor; it's not throwing a circular image, but it's heavily curved. On the 20D he'll be cropping quite a bit of that out. How wide he ends up I'm not sure, but it won't be a hell of a lot wider than the 10mm on the APS-C sensor. I may be wrong on this, but it seems to me on the fisheyes the angular coverage gets more compressed at the edges. That is to say, on a rectilinear lens if you have 100 degrees of angular coverage and you crop out the middle 50% of the image, you get 50 degrees of coverage.
On the fisheye (I suspect, and I may be wrong) the distortion is happening because as you go closer to the edges you are packing more angular degrees into a smaller space on the sensor. IF this is true, then the same 50% crop off the fish might give nearly the same angular coverage as the middle 50% of the 10mm rectilinear. If that makes any sense? I don't have a fish to check it with, it's been a long time since I used one.
R.
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04/26/2006 09:40:30 AM · #8 |
From what I have read, the 15mm Fisheye has an effective FOV slightly less than the 10-22mm when it is at 10mm. But it is very close.
The 15mm Fisheye has a 180 deg FOV on the diagonal, not the horizontal. It's good marketing but not a true 180, it is more like 140 degrees horizontal on a full frame sensor, and something closer to 90-95 on APS-C.
On a 20D (or other APS-C sensor) the fisheye to me loses some of its appeal - it is neither rectilinear nor true fisheye, which is too bad. The results still look pretty cool, but if I had to choose one over the other I would have to think I would go with the 10-22mm.
Edit: I was close - 10-22 is 97 degree FOV. I think the 15mm Fisheye is something like 95 on APS-C.
EF Lens Chart
Message edited by author 2006-04-26 13:43:07. |
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04/26/2006 03:37:57 PM · #9 |
Thanks for the posts so far.
Anybody think Canon will ever make a 15mm fisheye lens for the APS-C sensor? Or should I not hold my breath... |
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04/26/2006 04:39:25 PM · #10 |
| I have tested both lenses on a 20D personally. The 15mm fisheye was wider than the 10mm. |
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04/26/2006 04:51:33 PM · #11 |
Originally posted by Jason:
I have tested both lenses on a 20D personally. The 15mm fisheye was wider than the 10mm. |
A lot, a little? Any more specifics? |
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