Recommended fisheye lens?

20 replies [Last post]
branny
Offline
Joined: Nov 6 2001

Looking for a good fisheye for a Canon 20D, 15mm I think and even though the Canon is cheaper than the equivelant Sigma, I'm hoping someone has experience of either one to help sway my decision.

Do not follow, I may not lead. Do not lead . . . I may not follow.

foxvideo
foxvideo's picture
Offline
Joined: Sep 9 1999

15mm on a 20D is not a fisheye, you need to allow for the x1.6 sensor, 15mm would be equivalent to 24mm on a 35mm. I bought a 10-20 Sigma for my 20D and had good results from it.

Dave Farrants Fox Video Editing

Chris.
Offline
Joined: Nov 5 2000

The 10-20 Siggy is a cracking lens. I don't think it's a true fisheye though, just an ultra wide

Mark M
Offline
Joined: Nov 17 1999

Yes, I have the Canon 10 - 20 on a 20D and it is not a fisheye. Just an ultra wide.
AFAIK the only manufacturer who makes a true fisheye for digital cameras is Nikon who do a 10.5mm, but I'm not even 100% sure it works on their non-full frame SLRs.

Adobe Certified Professional Premiere Pro CS6, Premiere Pro CC

Adobe Community Professional

George Rankine
Offline
Joined: Apr 3 2006
foxvideo wrote:
15mm on a 20D is not a fisheye, you need to allow for the x1.6 sensor, 15mm would be equivalent to 24mm on a 35mm. I bought a 10-20 Sigma for my 20D and had good results from it.

Although you are correct in saying the equivalent focal length will be 24mm, I'd suspect you'll still get the fisheye type distortion on the cropped part of the image?

George Rankine
Offline
Joined: Apr 3 2006
Mark M
Offline
Joined: Nov 17 1999

Sorry George, those're fisheyes for a full-frame camera. On the 20D they'd be the equivalent of a 24mm, and though wide would not be fisheye.
Using the Canon 10mm on mine does not give fisheye type distortion. It's wide, but not spherical.

Adobe Certified Professional Premiere Pro CS6, Premiere Pro CC

Adobe Community Professional

foxvideo
foxvideo's picture
Offline
Joined: Sep 9 1999
George Rankine wrote:
Although you are correct in saying the equivalent focal length will be 24mm, I'd suspect you'll still get the fisheye type distortion on the cropped part of the image?

You're correct - just checked and the 15mm Fixed FL fisheye does give a fisheye effect on a x1.6 sensor as opposed to the non fisheye effect on the 10-20.

Quote from user review on B&H:

The 5D having a full frame 35mm sensor giving me the true 15mm optically altered rounding effect known as fisheye(moderately so) and with the Xsi that has a 1.6X multiplier(smaller sensor) which give a subtler "barreling" effect.

Dave Farrants Fox Video Editing

George Rankine
Offline
Joined: Apr 3 2006

The point I made in an earlier post is that although I agree that the crop factor gives an equivalent 24 mm on a 1.6 sensor, the lens construction still will, i am almost certain, give a fisheye effect.
Your 10-20 is just a super wide angle, not a fisheye.

I have a 14mm prime, and although it's 14mm, it is not a fisheye.

I assume branny actually wants a fisheye, not a super wide angle which is a different beast altogether.
George

foxvideo
foxvideo's picture
Offline
Joined: Sep 9 1999

I think this link will clarify the question - LINK - See the Joshua tree pic half way down.

Info from HERE

Shows images from a fixed focal length 15mm fisheye on a 40D.

Dave Farrants Fox Video Editing

tom hardwick
Offline
Joined: Apr 8 1999

There's a very big difference between a FFFE (full frame fish eye) and a genuine one. The latter implants a 24 mm diameter circular image onto the full frame and has little use other than in scientific work. I'm thinking that Branny wants a FFFE, but finding one of these for the little 20D chip will be difficult.

Probably better to do it by using an add-on lens, and Raynox do a vast array of them. Start here:

http://www.raynox.co.jp/english/dcr/dcrcf187pro/index.htm

tom.

branny
Offline
Joined: Nov 6 2001

Thanks for the input guys. Despite the lack of full frame, I need as close to fisheye as I can get. This is for the 2nd cam. I'm splashing out on the Nikon D3 shortly and just wanted to have a good arsenal of lenses to keep the Canon going.

Do not follow, I may not lead. Do not lead . . . I may not follow.

George Rankine
Offline
Joined: Apr 3 2006

I hope I'm not I'm not covering something that's already been said in a previous post, but I think it's worth repeating as it may help Branny in his quest for the correct lens and the whole question of focal lengths in crop sensors.
Firstly, we currently have 3 sensor sizes, full frame which has a sensor the same size as 35mm film, ie 24x36mm (Canon 1Ds range,5D and Nikon D3 and D7000, APS-H sensors with a crop factor of 1.3 Canon 1D range) and APS-C sensors with a crop factor of 1.6. (Canon 40D and below) and the equivalent area covered compared to full frame is the reciprocal of these numbers. I mention only the Canon ones in the smaller sensors as I haven't checked Nikon and I'm familiar with Canon!

A lens's focal length doesn't of course change physically, a 24mm is always a 24mm and a 500mm is always a 500mm, no matter which body it is on, and the characteristics of that lens, hyperfocal point, bokeh, DoF etc can't change, but what does change with the crop sensors is precisely that ie they crop! so it's like taking a full frame image in photoshop and reducing it's physical size by cropping.

This gives the effect of a longer focal length, but of course doesn't alter the composition of the picture.
So for instance a shot with a 500mm lens on a full frame and a 300mm on a 1.6 crop will give almost the same coverage, the 500mm will have much less DoF so can give an image which has more background blur etc.
Also the old rule of thumb re min shutter speed being the reciprocal of focal length should be taken as the actual focal length of the lens, not the cropped focal length (ignoring for the moment IS )

So when we get to fisheye lenses, a 1.6 crop will only "see" the centre part of the image created by the lens, so a lot of the "distortion" effects will be lost.
So it really depends on what you are trying to achieve as to which lens is correct for you. Sigma used to do a 10mm fisheye I think for 1.6 crop sensors, not sure if they still do.
George

Edit..here's the siggy.. http://www.sigma-imaging-uk.com/lenses/dclenses/10mm_fisheye.htm

George Rankine
Offline
Joined: Apr 3 2006

Branny, sorry my reply crossed with yours.If you are not in a rush, there are strong rumors of a replacement 5D in the Canon range which would mean you could use your existing lenses (as long as they aren't all -S lenses!).

branny
Offline
Joined: Nov 6 2001

Thanks for the homework George and everyone else who helped in the quest. DSLR's are nearly as kit complicated as video, but the siggy 10mm looks good enough.

Do not follow, I may not lead. Do not lead . . . I may not follow.

George Rankine
Offline
Joined: Apr 3 2006

Just remember if you ever go f/frame, it won't fit.....!!!!

And here's the real fisheye, 4.5mm....!!!
http://www.sigma-imaging-uk.com/lenses/dclenses/4mm_circular.htm

Mark M
Offline
Joined: Nov 17 1999

Thanks from me, too, George for the homework and the explanations. I hadn't realised that proper fisheyes were available now for the smaller-sensor DSLRs. That 4.5mm is on my shopping list now!

Adobe Certified Professional Premiere Pro CS6, Premiere Pro CC

Adobe Community Professional

Chris.
Offline
Joined: Nov 5 2000

Branny, I'd hold off on that D3 purchase til you see what Canon brings out in the Autumn.

George Rankine
Offline
Joined: Apr 3 2006

Chris, are you making a further comment on my post above re the 5D/...a mk2 has to come out very soon now, and the Autumn is the next release date for new models, I suspect. Or do you know something different???...

George

Chris.
Offline
Joined: Nov 5 2000

Not specifically George, but there's a big show and traditionally Canon announce new models. I don't know anything you don't.

tom hardwick
Offline
Joined: Apr 8 1999

Then again, if you wait on the station platform because you've been told the next train is even faster and plusher than the one waiting in front of you, you'll never get to Croyden.