[hugin-ptx] Re: Fisheye image set?

2012-01-21 Thread Erik Krause 

Am 21.01.2012 09:09, schrieb Thomas Pryds:

I think I'm for a circular one, though. Although I don't have much to
base this preference on ;-)


With a (true) circular one you simply waste half of your sensor pixels. 
If you shoot sphericals you get a much lower resolution. For a table see 
http://wiki.panotools.org/DSLR_spherical_resolution


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Erik Krause
http://www.erik-krause.de

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Re: [hugin-ptx] Re: Fisheye image set?

2012-01-21 Thread Carlos Eduardo G. Carvalho (Cartola) 
 2012/1/21 kfj <_...@yahoo.com>

> And keep in mind you waste quite a bit of sensor surface with a
> circular fisheye (about half the image comes out black)
>

But this will only happen in a full frame sensor camera. As Markku has
said, the Samyang lens covers the full APS-C sensor, which is the sensor of
most amateur people like me, as the cheaper canon with fullframe sensor
body starts at more than US$ 2,000.00. In Brazil, where it is imported, it
goes up to the equivalent of US$ 4,000.00.

Cheers,

Carlos E G Carvalho (Cartola)
http://cartola.org/360

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[hugin-ptx] Re: Fisheye image set?

2012-01-21 Thread kfj 
On 21 Jan., 09:09, Thomas Pryds  wrote:
> 2012/1/20 Erik Krause 
>
> > Me too. This doesn't need to be an expensive one. The Samyang 8mm (also
> > sold under different brands) will do:
> > ...

see also

http://www.lenstip.com/160.11-Lens_review-Samyang_8_mm_f_3.5_Aspherical_IF_MC_Fish-eye_Summary.html

I use and like this lens as well.

> Thanks. I think I'm for a circular one, though. Although I don't have much
> to base this preference on ;-)

With a full frame fisheye, particularly with the Samyang with it's
stereographic projection, you can take quite nice very-wide-angle
images which don't look quite as distorted as 'real' fisheye images.
And keep in mind you waste quite a bit of sensor surface with a
circular fisheye (about half the image comes out black) - this will
reduce your useful amount of pixels, and if, for example, you just
have a 12MP sensor and make a panorama, you won't be able to zoom in
very far.

On top of that the Samyang is a real bargain.

You may also want to have a look at

http://wiki.panotools.org/Special_issues_with_fisheye_lenses

for more on fisheyes

Kay

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Re: [hugin-ptx] Re: Fisheye image set?

2012-01-21 Thread Thomas Pryds 
2012/1/20 Erik Krause 

> Me too. This doesn't need to be an expensive one. The Samyang 8mm (also
> sold under different brands) will do:
> http://michel.thoby.free.fr/**SAMYANG/Early%20test%20report.**html
>

Thanks for the recommendation. I see that this page also links to an image
set shot with this particular lens. I will try having a look at these
images, and have this lens in my mind with looking for one to buy.


> If you want full frame (on full frame sensor), get a Zenitar 16mm
>

Thanks. I think I'm for a circular one, though. Although I don't have much
to base this preference on ;-)

Thomas

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[hugin-ptx] Re: Fisheye image set?

2012-01-20 Thread Erik Krause 

Am 19.01.2012 22:39, schrieb panostar:


I would recommend a true fisheye lens.


Me too. This doesn't need to be an expensive one. The Samyang 8mm (also 
sold under different brands) will do:

http://michel.thoby.free.fr/SAMYANG/Early%20test%20report.html

If you want full frame (on full frame sensor), get a Zenitar 16mm

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Erik Krause
http://www.erik-krause.de

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[hugin-ptx] Re: Fisheye image set?

2012-01-19 Thread panostar 
On Jan 19, 6:32 pm, Thomas Pryds  wrote:
> Does anyone here know of somewhere to obtain a (free) set of fisheye images
> in a reasonable resolution for stitching into a panorama?

Try the image sets at http://tinyurl.com/2f9sgh

> On a side note: What would you recommend? A "true" fisheye lens to put
> directly onto the camera body, or one of these (less expensive) lenses to
> put on top of an ordinary lens?

I would recommend a true fisheye lens.

John

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