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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 15 Jan 2015 (Thursday) 18:47
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Ultra Wide/Fish Eye with Full Frame question

 
Namerifrats
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Jan 15, 2015 18:47 |  #1

So I have a Sigma 10-20, used it a lot on my 7D. Good lens, loved the effects on the 10mm end. Bought a 6D last summer, wanting to get a ultra wide with it. I have my eye on the Canon 8-15 F4L. I looked as sample photos and saw the "circular" images, figured maybe they were created using a different style hood as opposed to a wide lens hood. While this effect would be interesting in some instances, I don't want that on most images. I understand that 10mm on a crop sensor is not as wide as 10mm on full frame. Just curious about where the extreme vignetting starts as far as focal range. I want something to give me the equivalent view of 10mm on a crop sensor. Wide, some distortion, but not the black circular "frame". Thanks in advance!


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Jon
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Jan 15, 2015 19:28 |  #2

The effect of a Sigma 10-20 UWA zoom and 7D in full frame body? Canon's' 16-35 L would be the best. But if you're jonesin' for eye-popping non fishey UWA on your 6D, look at Sigma's 12-24.

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GeoKras1989
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Jan 15, 2015 19:37 |  #3
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I had a 10-22 for my 60D. When I bought a 6D, the logical (for me) replacement was the 17-40. After a shoot this summer where the 17-40 was not near wide enough, I bought a Rokinon 14mm f/2.8 UMC. Love it! Razor sharp wide open. Huge DOF stopped down. It is certainly wide, but I also wanted something wider. I picked up a Sigma 15mm f/2.8 FE. Love that one, too! The Rok 14 is better than the Canon 14mm II, at 1/10 the price, but no AF. The Sigma 15 is better than the Canon because it is 1/2 the price and focuses closer. (5.9" vs 6.9", which matters with FE)

If you want wide, with some distortion, and you don't mind manual focus, check out the Rokinon 14mm f/2.8 UMC. I am old and don't see well and I have no problems focusing this lens. F/8, focus at 4 feet. Everything from 18" to infinity is focused just fine.


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Namerifrats
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Jan 15, 2015 20:39 |  #4

Good info! I'll check these out, wanting to get one ordered in the next day or two. Just wanting to find the widest lens I can get without vignetting issues. I really like the Sigma 10-20, but it won't work with my 6D. The next widest thing I have is a Canon 24-105 f4 L, and 24 isn't near wide enough.


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apersson850
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Post edited over 4 years ago by apersson850. (2 edits in all)
     
Jan 16, 2015 06:42 |  #5

Canon's EF 8-15 mm f/4L fisheye USM will give you an image that fills the frame on a 24*36 mm camera when set to 15 mm focal length. You can't zoom much wider before vignetting starts (perhaps at 14 mm).
Thus you get about the same result on such a camera when the lens is set at 15 mm as you get when it's mounted on an APS-C camera and the lens is set to 10 mm.

The effect can be used to the extreme, if desired.

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titi_67207
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Jan 16, 2015 06:57 |  #6

+1 on the Samyang/Rokinon ultra-wide 14mm f/2.8, very usable @f2.8 and in 2nd hand at cheap price... if Manual focusing is not an issue, this is the option to consider. And you can find profile for lightroom to correct the wavy distorsion.

Concerning Samyang, they have recently announced a 12mm fisheye which should be very good.

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GeoKras1989
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Jan 16, 2015 07:05 |  #7
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Nice shot, apersson580. But I don't agree with your lens suggestion. The OP want a diagonal fisheye (frame-filling). While the 8-15 does that, it is also $1,400. OP, this lens turns into circular FE at 8mm. If you don't want that, why pay for it? Getting close to things is what FE is all about. This Sigma 15mm f/2.8 FE focuses a small bit closer than the Canon 8-15 (5.9" v. 6.2"). I got my Sigma used for $425. One other thing to note. The front element on the Canon protrudes - it has to on a circular FE. The Sigma has a minimal hood, which affords minimal protection, built in.


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GeoKras1989
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Jan 16, 2015 07:14 |  #8
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titi_67207 wrote in post #17385086 (external link)
+1 on the Samyang/Rokinon ultra-wide 14mm f/2.8, very usable @f2.8 and in 2nd hand at cheap price... if Manual focusing is not an issue, this is the option to consider. And you can find profile for lightroom to correct the wavy distorsion.

Concerning Samyang, they have recently announced a 12mm fisheye which should be very good.

Titi


Totally agree. I got my Rok 14mm for $297 - no shipping at B&H. I've seen it used for $225. Manual focusing is only an issue with this lens if you are working really close to subject at wide apertures. LV & 10X does quite nicely. For landscape stuff where the focus is more than 18" from the camera HFD works just fine. I set the lens to f/5.6-f/11 and focus to 3'-5' and done. Everything is in focus. I just need to get out of the habit of mashing the BBAF button every time I use this lens!

Oh, the LR profile for this lens is pretty good with the distortion. You have to manage your own vignetting, though. The profile is made for f/2.8. You can use it at other apertures, it just over corrects vignetting which I have to add back.


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Post edited over 4 years ago by Arutemu. (2 edits in all)
     
Jan 16, 2015 07:27 |  #9

My 2c. I have both the Rokinon 14mm and the Sigma 12-24mm that I use on my 6D. Rokinon is nice, no question about it. The decision, really, is whether you are willing to deal with the limitations of a fixed focal length. I tried Sigma 12-24 and decided that this was it for me. Super wide without getting fishy. Zooming capability up to 24mm - right up to the point where my 24-105 begins. Sharp too. Take a look at samples of Sigma 12-24 on a 6D here:

https://photography-on-the.net …/showthread.php​?t=1411777


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GeoKras1989
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Jan 16, 2015 08:04 |  #10
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I forgot about the 12-24. That is one I also considered. It reviews nicely, buts cost 3x the price of the Rokinon 14. It would certainly be more versatile than a prime. I was more concerned with the $$$.


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Jan 16, 2015 08:25 as a reply to  @ GeoKras1989's post |  #11

Yes, it is costlier than the Rok 14 - if you are talking about the Mk. II of 12-24. I bought the 12-24 Mk. I for around $350 on ebay and am very happy with it.


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Namerifrats
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Jan 16, 2015 20:23 |  #12

A prime wouldn't bother me, same with manual focus. I find myself using manual focus a lot anyway. I'm leaning towards tbe Sigma 12-24 for versatility. Sounds like it would suit my needs really well. The Sigma 10-20 was plenty wide on the 7D. I did a comparrison of the 2 for view angles. The specs for the Sigma 10-20 show 102.4 degrees of view, compared to 122 devgrees on the Sigma 12-24 on full frame. I would expect some vignetting below 14mm due to what was stated above. So I checked the view of the Rokinon 14mm that was listed above, it gives 115 degrees. So if I understand this corrently, I should be able to get a slightly wider angle around 14mm on the 6D than I did at 10mm on the 7D.


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Jan 16, 2015 20:46 |  #13

10mm on the 7D is the same FOV as 16mm on the 6D. The 17-40 is very nearly as wide on FF as the 10-20 on Crop. If you want the equivalent of the 10-20 for the 6D it would be the 17-40. If you want something better it would be the 16-35 f4 IS.

14mm on the 6D will be wider than 10mm on the 7D (the Rok 14mm is still a good lens and the best value for money that wide on FF).

The reason the 8-15mm FE is wider at 15mm than any of the other lenses mentioned is that it is a fish-eye lens, not rectilinear. Unless you want the circular image or want to use it as a fish-eye on both the 7D and 6D, then you'd probably be better off getting a 15mm fish-eye (old Canon or Sigma).


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Jan 16, 2015 20:47 as a reply to  @ Namerifrats's post |  #14

14 is quite a bit wider, just like 12mm. I was expecting 12mm to be a lot wider than 14, but 122 vs 115 isnt a whole lot.

not sure how that works out, in general, the wide end gets really wide with every mm, but 12 vs 14 seems to be an exception. The 14mm is a great astro lens, and fairly fast aperture, that and the pure optics would be it's biggest advantage.


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Jan 17, 2015 06:37 |  #15

Namerifrats wrote in post #17384490 (external link)
So I have a Sigma 10-20, used it a lot on my 7D. Good lens, loved the effects on the 10mm end. Bought a 6D last summer, wanting to get a ultra wide with it. I have my eye on the Canon 8-15 F4L. I looked as sample photos and saw the "circular" images, figured maybe they were created using a different style hood as opposed to a wide lens hood. While this effect would be interesting in some instances, I don't want that on most images. I understand that 10mm on a crop sensor is not as wide as 10mm on full frame. Just curious about where the extreme vignetting starts as far as focal range. I want something to give me the equivalent view of 10mm on a crop sensor. Wide, some distortion, but not the black circular "frame". Thanks in advance!

Heya,

Well, there are zooms.

Or you could get razor sharp primes for this.

12~14mm would be ultrawide on full frame. Like Rokinon 14mm F2.8. A 16mm or 17mm lens is going to be the same field of view as you are used to on the 7D with a 10mm lens. So really, anything with 16mm or 17mm onboard will do the job for you too, like the Tamron 17-35 or the Canon 17-40. Otherwise, if you want to go wider, and not fisheye, the Rokinon 14mm is the way to go.

Very best,


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Ultra Wide/Fish Eye with Full Frame question
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