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View Full Version : What about Sigma 4.5 fisheye?



zakinjo
07-11-2012, 09:30 AM
Hello

Does anyone have any experience with the Sigma 4.5 fisheye for crop factor cameras? I am planing to buy one so I can take only 4 shoots around to make a full 360 panorama.

How is the picture quality? I have a Nikon 10.5 and wanted to compare the two lenses?

Any suggestions would be appreciated.

John Houghton
07-11-2012, 12:14 PM
You will waste a lot of pixels with the 4.5mm lens, but you can download sample sets of images for that lens and also 10.5mmm taken with a D300 at:
http://www.360precision.com/360/index.cfm?precision=products.camlensinfolist
.
John

Hugh
07-12-2012, 05:17 AM
Hello Zakinjo

I use both a Nikon 10.5mm (with a NN3) and a Sigma 4.5mm (with an R1 although I would get the same result with the NN3).
http://360hugh.co.uk/panormas/making-the-panoramas/

With the Sigma 4.5 I take 4 shots at 90 with a Nikon D3100, which is a DX or APS-C sensor and the image is full circle so John is right when he says you lose a lot of pixels because you are only using about 34% of the sensor.
You could get away with 3 shots round @ 120 intervals, but I prefer the extra overlap with 4 shots round @ 90 so that I can use PTGui's Mask tool to eliminate "ghosts".

Most of the panoramas on
http://www.keithprowse.co.uk/virtualtours/index.html
were made with the Nikon D3100 and Sigma 4.5mm lens.
We "cropped" the panoramas because the roof space is usually a lot of pipes and wiring and there are often stains on the carpets, but the lens does give a full spherical panorama and PTGui makes a good job of stitching them.

If you have any specific questions, just ask.

Hope this helps, Hugh.

zakinjo
07-18-2012, 03:17 PM
Ty all for the input.
I suppose from the examples shown that Nikon 10.5 has the advantage in picture quality over Sigma 4.5. Since I am interested in making really quality panoramas I will wait until I buy my first full frame camera (will probably go for the D800) so I can shave my Nikon 10.5, and use it to take 4 pic around.