Fisheye vs ultra-wide angle


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StreetShooter

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#1
What is exactly the difference between a fisheye lens and an ultra-wide angle lens?

I understand that a fisheye gives you a 180 degree view, but with vignetting ie your field of view is round instead of rectangular. An ultrawide angle lens, on the other hand, gives you a rectangular field of view.

What puzzles me is why there is a 15mm fisheye lens, and a 14mm ultrawide angle lens. Which would give a wider field of view? If the 15mm fisheye gives you a 180 degree field of view, does that mean the 14mm gives you a field of view greater than 180 degrees?

Would much appreciate some clarification on this, or links to a site that may help.
 

zapp!

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#2
I think the 14mm will give a lesser field of view due to rectilinear correction...

Wait for the technical experts to answer this...
 

Simon

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Jan 17, 2002
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#3
Originally posted by zapp!
I think the 14mm will give a lesser field of view due to rectilinear correction...

Wait for the technical experts to answer this...
I have a Sigma 14mm f/2.8 Prime, anyone wanna try it out? ;)
 

#4
If I am not wrong, there are 2 types of fisheye lenses - the one which gives severely distorted images covering 180° or more angle of view, giving you a circular image, and the rectilinear one which is more or less an ultrawide angle.

So, a 15mm fisheye can actually have more angle of view than a 14mm rectilinear lens, which has less distortion.

Regards
CK
 

Red Dawn

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Jan 17, 2002
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#6
Hi

slightly off topic:

i have read on dpreview (and they have shown samples) that with a fisheye lens on a digital SLR, the 1.6x multiplier does not crop the FOV 1.6 times. in fact, u will get a focal length very close to the lens' 35mm focal length (eg u can get near 15mm for a 15mm fisheye on a D30)

in other words, if not for the intended distortion of a fisheye lens, u can achieve very wide angles with a digital SLR and a fisheye lens....
 

siron

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#9
Originally posted by StreetShooter
What is exactly the difference between a fisheye lens and an ultra-wide angle lens?

I understand that a fisheye gives you a 180 degree view, but with vignetting ie your field of view is round instead of rectangular. An ultrawide angle lens, on the other hand, gives you a rectangular field of view.

What puzzles me is why there is a 15mm fisheye lens, and a 14mm ultrawide angle lens. Which would give a wider field of view? If the 15mm fisheye gives you a 180 degree field of view, does that mean the 14mm gives you a field of view greater than 180 degrees?

Would much appreciate some clarification on this, or links to a site that may help.
I read a book saying fisheye gives up to 220degree!! How true is that?
 

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