I just saw that Sigma have released their 8-16mm F4.5-5.6 DC HSM for crop sensor. Wow, that's WIDE for a non fisheye! Will interesting to see how it goes in the water.
I would assume that such a wide lens would have even more problems with soft corners though?
Ryan.
SIGMA 8-16mm F4.5-5.6 DC HSM
Started by aussie, Feb 20 2010 04:26 PM
9 replies to this topic
#1
aussie
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Posted 20 February 2010 - 04:26 PM
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#2
davephdv
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Posted 20 February 2010 - 10:48 PM
That's a wide lens. 4.5 to 5.6 makes is a somewhat slow lens.
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#3
Drew
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Posted 21 February 2010 - 12:12 AM
If it's anything like the 12-24 on FF, the corners will be soft until f11, and best at f16... by which time it'll be softened by diffraction. This is all tested on 16 and 21mp cameras.
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#4
davephdv
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Posted 21 February 2010 - 12:22 PM
It is for APS size cameras. These cameras crop out the soft edges. The reason why some prefer APS size cameras to full frame for wide angle.
Still I would be suspicious of soft corners due to the slow maximum aperture of this lens.
Still I would be suspicious of soft corners due to the slow maximum aperture of this lens.
Dave Burroughs, Nikon D300, D2X, Subal housing, DS160 strobes
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#5
echeng
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Posted 21 February 2010 - 12:27 PM
Let's not speculate about soft corners until someone actually takes the lens underwater.If it's anything like the 12-24 on FF, the corners will be soft until f11, and best at f16... by which time it'll be softened by diffraction. This is all tested on 16 and 21mp cameras.
#6
Stefin
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Posted 21 February 2010 - 03:33 PM
The built-in hood could be a problem for those of us with smaller domes and could cause unwanted reflections from inside larger domes.
It also looks like a "Phat" lens, remember the problems with the Nikon 105 VR and port diameters!
It also looks like a "Phat" lens, remember the problems with the Nikon 105 VR and port diameters!
#7
davelew
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Posted 21 February 2010 - 04:56 PM
The minimum focus of 0.46m makes me think a diopter might be needed with a dome port.
Since the Sigma 12-24 has a minimum focus distance of 0.28m, this sounds like a different optical formula and not just the 12-24 scaled down for APS sensors.
Edit to add: it looks like I made a mistake, the 8-16 actually has a minimum focus distance of 24cm. Now that I look, I can't actually find where I got the 46cm number, although I swear I didn't make it up!
Since the Sigma 12-24 has a minimum focus distance of 0.28m, this sounds like a different optical formula and not just the 12-24 scaled down for APS sensors.
Edit to add: it looks like I made a mistake, the 8-16 actually has a minimum focus distance of 24cm. Now that I look, I can't actually find where I got the 46cm number, although I swear I didn't make it up!
Edited by davelew, 21 February 2010 - 06:26 PM.
#8
aussie
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Posted 21 February 2010 - 05:44 PM
The minimum focus of 0.46m makes me think a diopter might be needed with a dome port.
According to the stats on dpreview (which I'm not saying is correct):
Closest focus distance 24cm (9.4in)
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#9
richcarey
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Posted 23 February 2010 - 04:07 AM
Does anyone know how much this lens will cost?
#10
bigkahunadiver
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Posted 28 February 2010 - 07:44 PM
does anyone know the release date? can not find it anywhere.....
