Full vs. Semi Fisheye

tuartboy

macrumors 6502a
Original poster
May 10, 2005
746
13
As a photographer who has never dabbled in fisheye, I have no idea how to answer a friend's question. She is interested in purchasing a fisheye lense and wishes to know the difference between a "full" and a "semi" fisheye lense.

I found some stuff about frame coverage and circular vs. full, but I'm still not sure if it is an adequate answer.
 

iGary

Guest
May 26, 2004
19,583
0
Randy's House
Semi-Fisheye?

There are semi-circular fisheye adapters.

Maybe she is talking full-frame?

There are circular fisheyes, rectangular fisheyes, and circular full frame fisheyes (might have one of those wrong).

Here's a circular fisheye shot:



All fisheye images can be re-maped to look "flat" with software like so:

 

Attachments

tuartboy

macrumors 6502a
Original poster
May 10, 2005
746
13
iGary said:
Semi-Fisheye?
There are circular fisheyes, full-frame rectangular fisheyes, and circular full frame fisheyes.
From the information I have found, it looks like I have seen the 2 circular types. How is the full-frame rectangular different from the circular types (design, results, etc...)?
 

iGary

Guest
May 26, 2004
19,583
0
Randy's House
tuartboy said:
From the information I have found, it looks like I have seen the 2 circular types. How is the full-frame rectangular different from the circular types (design, results, etc...)?
The full frame does not have the cropped circular edges like the circular fisheye does - it covers the whole frame without the circle:




A cicular is cropped like mine is above (Sigma 8mm):




Did she tell you what she wanted to use it for?
 

tuartboy

macrumors 6502a
Original poster
May 10, 2005
746
13
iGary said:
Did she tell you what she wanted to use it for?
Nope.

Well, it appears to be pretty straightforward. I'll just shoot her off to the wikipedia page on fisheyes and tell her there isn't really a "semi" lense and that should be fine.

Thanks for the help iGary.
 

Mike Teezie

macrumors 68020
Nov 20, 2002
2,205
1
I can tell you the little I know, I don't have a lot of experience with fish eye lenses.

On a 5D, the 15mm Canon fisheye is great. But on any 1.6 crop body, the effect is drastically less pronounced. I was blown away by the difference in the full frame versus the crop, the crop camera just looked like it had a pretty wide lens on it. Not much fisheye effect at all.
 

sjl

macrumors 6502
Sep 15, 2004
441
0
Melbourne, Australia
Mike Teezie said:
On a 5D, the 15mm Canon fisheye is great. But on any 1.6 crop body, the effect is drastically less pronounced. I was blown away by the difference in the full frame versus the crop, the crop camera just looked like it had a pretty wide lens on it. Not much fisheye effect at all.
Funny you say that. I know somebody who, this time last year, had a 20D and the Canon fisheye (amongst other things). I was a little surprised - for my money, if I had a fisheye, I'd be buying a full frame body to use it properly. A crop body - yes, even the 1D series - is a waste of the fisheye, in my opinion.

He bought a 5D a few months ago. I think he's a bit happier with the fisheye now. :D

and yes, a fisheye on a 5D is one of the things I'd like, but it's low on the list. Starting to think that I'll save my pennies for the 24-105 f/4L, then follow that up with the 17-40, and finally the 5D. "If I were a rich man ..." :eek:
 

cookie1105

macrumors 6502
Mar 27, 2006
426
0
London, UK
This is a fisheye picture from a 1.6x body. If you have any from a 1.3x or full frame body, please post them. I'd be really interested to see the difference in pictures rather than just numbers.

1.6x
 

brett33

macrumors member
Jul 15, 2004
78
1
Waco, TX
I believe that the circular fisheye gives a full 180 degree field of view all the way around, whereas the rectangular fisheye gives a diagonal 180 degree field of view. Something along those lines anyway.

I have a Sigma 8mm, it's a great lens for what it does, but the uses are relatively limited.