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03/28/2006 10:10:17 AM · #1 |
| What is the difference between a circular fisheye lens and a diagonal fisheye lens? thanks |
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03/28/2006 11:24:17 AM · #2 |
A circular fisheye lens projects an image circle that is approximately 24mm in diameter, so it fits on a 35mm frame. So a circular fisheye on a full-frame camera produces a round image that typically has 180 degrees (or more) of coverage in any direction. An 8mm circular fisheye normally covers about 183 degrees, for example.
A diagonal fisheye has an image circle that is about 44mm in diameter, and so it covers the 35mm frame corner to corner. The diagonal FoV of a 15mm fisheye is about 180 degrees. The horizontal and vertical FoV are of course less.
The tricky part comes when you put a circular fisheye lens on a 1.6-crop camera. The image circle will now cover the enitre frame horizontally and vertically, but the outer corners will be dark (they are outside the image circle). Incomplete de-fishing brings the corners of the image out to eliminate the dark corners, and makes an 8mm circular fisheye approximate the look of a 15mm fisheye on a full-frame camera. I used my Peleng 8mm fish and the Canon 10D like this for a couple years, and it worked great. There is slight blurring (stretching) of the image at the far corners, but is not visible except on large prints.
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03/28/2006 12:07:03 PM · #3 |
Peleng makes an inexpensive circular fisheye. This page has some links and plenty of samples.
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03/28/2006 12:16:57 PM · #4 |
| What we need is a Canon EF-S 8mm Peleg |
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03/28/2006 12:18:06 PM · #5 |
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03/28/2006 12:18:46 PM · #6 |
Originally posted by theSaj:
What we need is a Canon EF-S 8mm Peleg |
What you'd want is a 5mm version of the Peleng. Now that would be SHORT!
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03/28/2006 12:33:29 PM · #7 |
The writer of the link I posted has some interesting things to say regarding the Peleng, both good and bad. Either way it's an interesting read but for the money you can't really go wrong, I suppose.
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03/28/2006 12:38:11 PM · #8 |
If you are a Nikon user for a little more than Peleng you can get Nikon 10.5mm fisheye. With Nikon software it'll straighten image out and make it appear as if it was regular wide lens. Coolest thing I've seen. I'm planning to get one in the near future.
Nick
edit: spelling
Message edited by author 2006-03-28 12:38:52.
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03/28/2006 12:41:56 PM · #9 |
Originally posted by Nikolai1024:
If you are a Nikon user for a little more than Peleng you can get Nikon 10.5mm fisheye. With Nikon software it'll straighten image out and make it appear as if it was regular wide lens. Coolest thing I've seen. I'm planning to get one in the near future.
Nick
edit: spelling |
Nik....I'll bring it along on Saturday for the gtg. You can use it til your hearts content...or for two minutes. Whichever comes first.
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03/28/2006 12:42:51 PM · #10 |
Originally posted by pawdrix:
Originally posted by Nikolai1024:
If you are a Nikon user for a little more than Peleng you can get Nikon 10.5mm fisheye. With Nikon software it'll straighten image out and make it appear as if it was regular wide lens. Coolest thing I've seen. I'm planning to get one in the near future.
Nick
edit: spelling |
Nik....I'll bring it along on Saturday for the gtg. You can use it til your hearts content...or for two minutes. Whichever comes first. |
Seriously, I'll be happy to let you give it a good whirl.
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03/28/2006 12:48:36 PM · #11 |
Originally posted by pawdrix:
Originally posted by pawdrix:
Originally posted by Nikolai1024:
If you are a Nikon user for a little more than Peleng you can get Nikon 10.5mm fisheye. With Nikon software it'll straighten image out and make it appear as if it was regular wide lens. Coolest thing I've seen. I'm planning to get one in the near future.
Nick
edit: spelling |
Nik....I'll bring it along on Saturday for the gtg. You can use it til your hearts content...or for two minutes. Whichever comes first. |
Seriously, I'll be happy to let you give it a good whirl. |
Cool! Thanks!
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03/28/2006 01:09:40 PM · #12 |
And can you point me in the direction of that Nikon software that'll straighten out the image.
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03/28/2006 01:13:40 PM · #13 |
See now thats just funny ;) AND educational!! |
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