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03/29/2005 04:03:34 AM · #1 |
Just wondering if anyone knows what the FOV on a Digtal Rebel with a 1.6 crop factor will be. On a full frame it's suppose to be 180 degrees. I've got a Tokina 12-24 on back order, it's widest FOV is just above 90 degrees if I remember correctly. I'm thinking about getting this for cheap thrills while I wait for the Tokina if the FOV is much greater than the Tokina's 90 (above 120 degrees would be nice).
I know about the Peleng, but it's too much money just for fun and I still have to correct/defish the image.
Anyone with hints suggestions???
Thanks
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03/29/2005 05:28:40 AM · #2 |
Check this thread for some comparo's of the Zenitar with a Pentax 16-45mm, 14mm and Tamron 17mm. These were done on a Pentax *Ist D which has a 1.5x crop factor but still close enough to give you perspective on your question.
//forums.dpreview.com/forums/read.asp?forum=1036&message=12458381
From memory it was estimated at around 120degrees coverage but keep in mind that the Zenitar's 180degree coverage is diagonal not horizontal.
I have one for my Pentax and it's great value for the price.
bazz.
Message edited by author 2005-03-29 05:29:13. |
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03/29/2005 06:14:52 PM · #3 |
Gary,
Thanks for your input. I remember the FOV on the Zenitar being 180 degrees diagonally. Nice to know that it is about 120 degrees with the crop factor. According to B&H's specs, the Tokina 12-24's FOV is 99-61 degrees. I suspect this is horizontal, but they don't state. My geometry skills are bad and don't remember what that translates to in diagonal.
It certainly appears that Zenitar has a bigger FOV than Pentax 16-45mm at 16mm though. I'm just wondering how it would compare to the Tokina at 12mm. It seems that the FOV between the Zenitar and the 14mm lens was almost same. So I'm expecting the Tokina at 12mm will have better or similar FOV.
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03/29/2005 06:29:45 PM · #4 |
| because the zenitar is a fisheye it will be wider than all of those wide angle lenses. You will essentially lose the fisheye effect when it is used on the 300d though, because of the crop. If you still want a fisheye effect you will need to buy either the 8mm peleng or sigma lens. |
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03/29/2005 07:37:00 PM · #5 |
I just ran some calculations, and for 16mm fisheye, the numbers I come up with are:
HFoV: 83.1°
VFoV: 54.6°
DFoV: 100.9°
This agrees with what I find for my Canon 15mm fish, which calculates to just under 90° HFoV, and in practice I get exactly that.
Bear in mind the calculation is different for fisheye and rectilinear. Here is a reference for the pertinent equations.
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03/30/2005 01:32:06 AM · #6 |
Thanks Fritz,
It's good to have an engineer pitch in. I guess if Tokina's FOV (I'm assuminig horizontal) is 99 degrees at 12mm, then perhaps I should just save the money and wait for my Tokina to be shipped in from Adorama. Now only if it can get here before May 21 for the Queen Mary shooting...
Thanks for the input everyone.
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