Fisheye

Coleslaw (e2 Member)

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1 Feb 2012 - 9:17 PM

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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?

thewilliam

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1 Feb 2012 - 9:33 PM

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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.

ianrobinson (e2 Member)

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1 Feb 2012 - 11:55 PM

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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.

LeftForum

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2 Feb 2012 - 9:07 AM

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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:



.

MikeRC (e2 Member)

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2 Feb 2012 - 9:53 AM

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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 ?

MeanGreeny

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2 Feb 2012 - 10:31 AM

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A set of Samyang 8mm on Flickr

Is that enough examples for you ?

sherlob (e2 Member)

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2 Feb 2012 - 11:00 AM

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I have a sigma 15mm - it's a fine lens, but rarely used.

MikeRC (e2 Member)

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2 Feb 2012 - 1:07 PM

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...thanks for the examples people :

.....Mike