enbilaman
Posts: 123
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Registered: 3 Mar 2006
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Where can I view an image shot with a Sigma 4.5-mm?
Posted: 23 Jan 2008 at 14:54 GMT
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Hi,
tinyurl.com/26stg4
This page from the Sigma Corp website concerns the 4.5 fisheye lens.
I read there:
<<This autofocus circular fisheye lens has an angle of view of 180
degrees in all directions. It is exclusively designed for digital SLR
cameras with the APS-C size image sensor. When used in conjunction
with digital SLRs with APS-C size image sensors, it produces circular
image within the frame....>>
But I also read elsewhere in the same article:
<< * The angle of view depends upon the digital camera being used >>.
This statement may well be a left-over from the page template used
for all the Sigma lenses. I can't believe that cropping would occur
on any sensor of the compatible DSLR cameras (Sigma, Canon, Nikon)
taking into account such a short focal length.
Can anybody point me to a link for an image shot with this lens?
Regards,
Michel
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DorinDXN
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badders
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Smooth
Posts: 3773
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Re: Where can I view an image shot with a Sigma 4.5-mm?
Posted: 23 Jan 2008 at 15:23 GMT
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enbilaman said:
But I also read elsewhere in the same article:
<< * The angle of view depends upon the digital camera being used >>.
Maybe just covering the differences between 1.7x 1.6x, 1.5x multipliers between all camera brands with APS-C Sensors etc?
Regards, Smooth 
www.smooth360.info
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DorinDXN
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Re: Where can I view an image shot with a Sigma 4.5-mm?
Posted: 23 Jan 2008 at 15:51 GMT
updated: 23 Jan 2008 at 15:51 GMT
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There is also stated that
---8<---
Vignetting will occur if the lens is used with digital cameras with image sensors larger than APS-C size or 35mm SLR cameras.
---8<---
That leads to the meanning of that the angle of view can be greater on cameras with larger sensor with the expense of vigneting.
Now we only need software designed for APS-C cameras which to have an edit box with 0.x crop factor in the case of fullframe 
Dorin
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zxcvbnm
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Digital
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Registered: 21 Apr 2007
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Re: Where can I view an image shot with a Sigma 4.5-mm?
Posted: 24 Jan 2008 at 3:33 GMT
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Neither did I. Sigma 8mm f/3.5 I know of, not sure if the 8mm f/2.8 even exists.
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Smooth
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Re: Where can I view an image shot with a Sigma 4.5-mm?
Posted: 24 Jan 2008 at 4:52 GMT
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Yes, should be Sigma 10mm F/2.8 not 8mm.
Regards, Smooth
www.smooth360.com
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zxcvbnm
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Re: Where can I view an image shot with a Sigma 4.5-mm?
Posted: 24 Jan 2008 at 18:21 GMT
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Smooth said: Yes, should be Sigma 10mm F/2.8 not 8mm.
dissagree. could mean 8mm f/4 but looks wrong to be 10mm.
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Smooth
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Re: Where can I view an image shot with a Sigma 4.5-mm?
Posted: 24 Jan 2008 at 18:48 GMT
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zxcvbnm said: dissagree. could mean 8mm f/4 but looks wrong to be 10mm.
Francis,
I based that on the new releases of the Sigma fisheye lenses not on any image. f/2.8 was only associated with the 4.5mm and the 10mm so it was my assumption that if it wasn't the 4.5mm it must the 10mm at f/2.8. The site URL doesn't load for me.
Regards, Smooth
www.smooth360.com
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