Originally posted by paperbag846 Beyond 16mm, you are going to have to pay more for a good WA. I think the sigma zoom would be more bang for the buck than paying close to 400 dollars just for a couple MM wider than your 16mm.
I think there is a lot that depends on where the photographer is now, and what he wants to do.
I have the sigma 10-20, first version F4-5.6 and thoroughly have enjoyed the lens, (used it for 5 years now. But I still went out and got the samyang 14.
There are a few reasons, first, F2.8 is 1 1/2 stops faster than my sigma at 14mm. think about this, 3 times the shutter speed, in low light situations. that is a big incentive, even with shake reduction.
Also consider this is a full frame lens. need something wider, get a film body, and shoot, Now, on full frame the lens has a wider angle of view than the sigma 10-20 on a dslr. That is somethign to consider. I have already used my samyang 14 on my PZ-1, there is no noticible vignetting even on film, there are very few lenses at 10mm on digital that have no visible vignetting.
So the samyang provides some options. speed and overall very well optically designed, it probably compares favourably with other offerings, at a bargin price.
this is not a sales pitch for the samyang, but just pointing out the strengths.
OK now for the weaknesses, it is big almost as big as my sigma 10-20 but lighter, has a permenant hood which is designed for full frame not digital, the lens is a plastic barrel, there are no provisions for filters either front or rear, and it is MF
But for those who want a low cost UWA which performs well, it is worth a look