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Fisheye question.

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grilledsteezeyo
Posts: 1419 - Karma: 72
hey ns, i just got my first dslr (canon rebel xsi) and have been shooting a fair amount and would really like a fisheye to add to my gear. i was wondering which one of these two lenses that i chose would be better to have? and if not any recommendations for a relatively cheap price?
http://opteka.com/opt65.aspx
http://www.amazon.com/Rokinon-FE8M-C-Fisheye-Canon-Black/dp/B002LTXQUE
i know there aren't tons of options or great lenses at a low price but any helps appreciated
thanks!
Mar 8 2011 7:05PM
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NickSki.
Posts: 2009 - Karma: 61
Im pretty sure there there the same lense, different brand.
Mar 8 2011 9:31PM
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IanAvery-Leaf
Posts: 9926 - Karma: 9,343

Mar 8 2011 9:44PM
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ganja_enthusiast
Posts: 1119 - Karma: 34
yes they are basically the same lens.

Id go for the opteka because they are super reliable and i dont really know anything about the other one except for its the same lens as the opteka.

Im not sure if you know this but certain lenses work for certain cameras. The canon rebels have a 1.3mm or a 1.6mm frame im pretty sure. but to my point is for most fisheyes, they only have the "Fisheye effect" on a full frame camera. Opteka did a good job with thier Dslr fisheye and made it compatable with smaller frame cameras.


Mar 8 2011 11:57PM
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eheath
Posts: 61087 - Karma: 118,024
8mm would be circular in the frame on a full frame. 8mm will be very fishy on a crop sensor.
Mar 8 2011 11:59PM
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ganja_enthusiast
Posts: 1119 - Karma: 34
yes thanks for sumarizing for me
this is what i was trying to explain.
youll have a bunch of vig and that oesent look good in pictures.
Mar 9 2011 12:01AM
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eheath
Posts: 61087 - Karma: 118,024
On the crop there shouldn't be...
Mar 9 2011 12:02AM
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ganja_enthusiast
Posts: 1119 - Karma: 34
yes but then you will have just a wide angle lens
it will crop out the fisheye effect.
Mar 9 2011 12:39AM
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solitaryman
Posts: 3578 - Karma: 123
It's called a rectilinear fisheye.
Mar 9 2011 12:49AM
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ganja_enthusiast
Posts: 1119 - Karma: 34
.
Mar 9 2011 1:10AM
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eheath
Posts: 61087 - Karma: 118,024
Not an 8mm...
Mar 9 2011 1:47AM
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Ben.
Posts: 21463 - Karma: 683
no. its a fisheye.

op. its the same lens. samyang, bower, rokinon, vivitar, all the same lens. no vig on any of them, except maybe the samyang. ive heard that one has a tiny bit.
Mar 9 2011 2:24AM
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Balto
Posts: 25985 - Karma: 4,398
any one have any experience with an 8mm fish on a 1.3 crop? (1dmk2?) I can never seem to find any sample shots, only on FF and 1.6x
Mar 9 2011 3:13AM
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IanAvery-Leaf
Posts: 9926 - Karma: 9,343
no, those are two different things

rectilinear = strait lines stay strait

fisheye = horizontal and vertical lines get more distorted the farther from the center they are

cropping a fisheye image ≠ rectilinear because the image is still distorted
Mar 9 2011 8:30AM
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TWoods
Posts: 10014 - Karma: 8,385
No, it won't. Both of those lenses are made for cameras with crop sensors. They are fisheye on crop sensor cameras, and on full frame cameras they will show the sides of the barrel of the lens.

the pro-optic 8mm (same lens, different name) on a crop sensor nikon:

Click for larger image


and full frame:

Click for larger image



As mentioned above, rectilinear means straight lines. If you are talking about putting a full frame fisheye on a crop sensor camera, you could call it a distorted wide-angle, I guess.
Mar 9 2011 12:22PM
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grilledsteezeyo
Posts: 1419 - Karma: 72
ok so, if i went with the opteka lens on my camera there wouldn't be any vignette? again my cameras a canon rebel xsi. im still kind of a noob at this so sorry for all the questions.
Mar 9 2011 4:09PM
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Ben.
Posts: 21463 - Karma: 683
shouldnt be.
Mar 9 2011 4:14PM
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ganja_enthusiast
Posts: 1119 - Karma: 34
.
Mar 9 2011 5:41PM
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HeadyTopper
Posts: 1170 - Karma: 97
sigma 10mm f2.8
Apr 9 2011 2:59PM
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quaive
Posts: 1055 - Karma: 99
if it is your first lens i wouldnt recommend a fisheye. i was thinking about getting one, then got a 70-300mm f4.5/5.6 and am pretty happy about that purchase. im not really even considering a fisheye until i get some more lenses. just my .02
Apr 9 2011 3:12PM
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