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Fisheye


Coleslaw 15 13.4k 28 Wales
1 Feb 2012 9:17PM
Starting to grow a bit of interest in fisheye lens.
So, just wondering:
What is the difference between Circular fisheye and diagonal fisheye lens?
Also, recommendation on good and cheaper fisheye lens on full frame camera?
Nick_w Plus
13 4.3k 99 England
1 Feb 2012 9:31PM
Circular produces a round image Cole. Diagonal a heavily distorted one.

I too am looking forward to any replies.
thewilliam 12 6.1k
1 Feb 2012 9:33PM
A circular fisheye delivers exactly what its name suggests: the image is a 24mm diameter circle for full-frame. The angle of view is 180 degrees for 8mm and 220 degrees for 6mm focal length. Nikon did a lovely 6mm f2.8 in AIS fitting.

Imagine a slightly bigger circular image and cut out a rectangle 24mm x 36mm so that the corners touch the circumference of the circle. That is the so-called diagonal fisheye frame and the Nikon lenses are 10.5mm for DX format and 16mm for FX.
Coleslaw 15 13.4k 28 Wales
1 Feb 2012 9:41PM
So, circular is circle in a rectangular box, while diagonal is rectangular box in a circle?
ianrobinson 10 1.2k 8 United Kingdom
1 Feb 2012 11:55PM
canon do a great 8-15mm f4 fisheye lens that does the circular bit at 8mm and distorted bit at 15mm bit costly though but then it does both.
coliwolii 11 69 United Kingdom
2 Feb 2012 4:52AM
If you want cheap - Lensbaby's fisheye adapter is pretty decent.

Tony Sweet has been a bit of a fan since its release, you can see his "Lensbaby fisheye" gallery here - S-W-E-E-T!
User_Removed 10 4.6k 1 Scotland
2 Feb 2012 9:07AM
I use a Sigma 8mm fisheye on my Nikon D3s (and used it previously on my D300 but, on a crop frame camera the circle is top- and bottom-sliced).

Here is an image from it, taken lying on my back looking up into the dome of the Royal Observatory in Edinburgh:

1-astronomers--dome-113.jpg


.
Coleslaw 15 13.4k 28 Wales
2 Feb 2012 9:09AM
I think I am actually interested in the diagonal one, rather than the circular one then.
MikeRC 15 3.6k United Kingdom
2 Feb 2012 9:53AM

Quote:I think I am actually interested in the diagonal one, rather than the circular one then.


...me too...can we please have an example ?
Pete Plus
19 18.8k 97 England
2 Feb 2012 10:00AM

Quote:...me too...can we please have an example ?

this is from the Canon EF 15mm f/2.8 full frame fish eye.
It's not a great pic (badly exposed and badly scanned) but shows what angle you get from the lens. It was taken on an EOS film camera.
And if you search the site you will find several reviews of fish eye lenses including both types. Click the review link in the blue bar on the left of this link
MeanGreeny 15 3.7k England
2 Feb 2012 10:31AM
A set of Samyang 8mm on Flickr

Is that enough examples for you ?

Wink
NikLG 15 1.7k England
2 Feb 2012 10:54AM
That Samyang is supposed to be pretty decent. A mate of mine has one, feels nice and solid. Only MF I think....good price though.
It's also available under a host of other names.
sherlob Plus
14 3.1k 129 United Kingdom
2 Feb 2012 11:00AM
I have a sigma 15mm - it's a fine lens, but rarely used.
thewilliam 12 6.1k
2 Feb 2012 11:47AM

Quote:So, circular is circle in a rectangular box, while diagonal is rectangular box in a circle?


Brilliantly put!
MikeRC 15 3.6k United Kingdom
2 Feb 2012 1:07PM
...thanks for the examples people :

.....Mike

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