GrahamR
journeyman
Reged: 13/11/2006
Posts: 78
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Hi all,
Reading some reviews. It is possible to thake pictures of the full fisheye effect ,and then correct them with software.
Any ideas what this software is.
Thanks
Graham
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Zou
Pooh-Bah
Reged: 05/02/2007
Posts: 2090
Loc: Edinburgh
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DxO does it I think.
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Zou's Flickr Page
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LargeFormat
old hand
Reged: 24/10/2006
Posts: 1063
Loc: Buckinghamshire and Cumbria
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Quote:
DxO does it I think.
That's right but you can also do it in Paintshop Pro (and no doubt others) ADJUST/FISHEYE CORRECTION with a bit of a fiddle.
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Monobod
'Phantom' of the forum!
Reged: 03/04/2003
Posts: 5798
Loc: Just West of Norwich, Norfolk
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Why buy a fisheye and then 'coorect' it? Why not just use a rectilinear wide angle like the Sigma 10-20? Am I missing something?
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David.
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Photos hosted by Flickr.
www.flickr.com/photos/monobod/
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I see the world thro' a viewfinder, but the world watches me via CCTV!
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johnriley1uk
addict
Reged: 08/06/2006
Posts: 423
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Yes it does seem strange... 
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Best regards
John Riley
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Done&rundleCams
Senior Member
Reged: 20/12/2001
Posts: 16631
Loc: Vancouver, BC
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Quote:
Why buy a fisheye and then 'coorect' it? Why not just use a rectilinear wide angle like the Sigma 10-20? Am I missing something?
Hi David,
Perhaps, it a best of both worlds scenario  . That and, possibly,
because the "fisheye's" generally less expensive than the rectilinear
versions ......which, now, has me thinking 
Anybody wanna buy a 12-24/4 
Cheers,
Jack
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Life is a Photo-op
MY BLOG: www.nakedmanonawire.blogspot.com
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LargeFormat
old hand
Reged: 24/10/2006
Posts: 1063
Loc: Buckinghamshire and Cumbria
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Quote:
Why buy a fisheye and then 'coorect' it? Why not just use a rectilinear wide angle like the Sigma 10-20? Am I missing something?
Yes. The 16mm attributed to a full frame rectangular fisheye isn't the same as a 16mm rectilinear. It's a much wider angle and that can be a reason for using one.
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Monobod
'Phantom' of the forum!
Reged: 03/04/2003
Posts: 5798
Loc: Just West of Norwich, Norfolk
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Hence my suggestion of the Sigma 10-20!
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David.
-----------------------------------------------
Photos hosted by Flickr.
www.flickr.com/photos/monobod/
-----------------------------------------------
I see the world thro' a viewfinder, but the world watches me via CCTV!
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LargeFormat
old hand
Reged: 24/10/2006
Posts: 1063
Loc: Buckinghamshire and Cumbria
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Quote:
Hence my suggestion of the Sigma 10-20!
My post refered to full frame. On APSc the same applies but substitute 10mm for 16mm. The focal length of a fisheye on 35mm is 16mm, on APSc it is 10mm and on 4/3 it is 8mm. In each case the angle, or field, of view is 180 degrees measured in the conventional way across the diagonal. A 16/10/8mm wide angle will give an angle of view of about 110 degrees. Ergo the Sigma 10-20 will not give the same field of view as a fisheye although you can worry less about getting your feet/tripod/neck strap in the frame.
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GrahamR
journeyman
Reged: 13/11/2006
Posts: 78
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Many thanks for your replies.
I have just ordered my 10-17 fisheye.
I wanted the fisheye, for the wonderful effects that I have seen from it, but with also the possibilites of correcting the angle when nearer the 17mm, when it is much more a normal wide angle.
I hope for some good results.
Graham
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johnriley1uk
addict
Reged: 08/06/2006
Posts: 423
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Quote:
focal length of a fisheye on 35mm is 16mm,
Not necessarily. Fisheye lenses come in different types and projections and can be anything from 6mm or so upwards.
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Best regards
John Riley
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LargeFormat
old hand
Reged: 24/10/2006
Posts: 1063
Loc: Buckinghamshire and Cumbria
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Quote:
Quote:
focal length of a fisheye on 35mm is 16mm,
Not necessarily. Fisheye lenses come in different types and projections and can be anything from 6mm or so upwards.
I did expressly refer to rectangular fisheyes and refered to the angle of view being measured across the diagonal. 6mm fisheyes give a circular image. Bit tricky to measure the diagonal.
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johnriley1uk
addict
Reged: 08/06/2006
Posts: 423
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Even so, a full frame fisheye does not need to be 16mm. Previous Pentax fisheyes have been 17mm and 18mm, for example.
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Best regards
John Riley
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Zou
Pooh-Bah
Reged: 05/02/2007
Posts: 2090
Loc: Edinburgh
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I believe the figure was given as an example, not doctrine...
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Zou's Flickr Page
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