Originally posted by kenhreed
A similar lens from Pentax/Sigma would not be $ 349.99, would it?
What's the catch?
Yep there's always a catch isn't there, and it's wise to be wary. Infinitely wiser to be open minded though.
In this case you lose Auto Focus capability, and lack of inbuilt image stabilisation. (the latter not a huge deal breaker for P.K users)
Otoh, like the smart ones here attest re: its merits and great value, c/w their samples of proof to back up claims (+ you'll find thousands more on Flickr etc), it's one of the rare bargains in its range and IQ abilities,
provided you can wear the inconveniences.
Bower is just one rebadger of Samyang of Sth Korea lenses, another goodie I have my beady eyes on for future acquire is their 8mm Fisheye.
Also have a juicy priced 14mm wide angle prime.
Fwiw: Be aware that some of the Samyang/whoever types that are commisioned~relabeled for different badge-OEMs can have different or lesser function; take the two 85/1.4s below at B&H for example - Vivitar in this case:
http://www.bhphotovideo.com/c/product/600851-REG/Vivitar_85MMC_85mm_f_1_4_Series_1.html http://www.bhphotovideo.com/c/product/600854-REG/Vivitar_85MMP_85mm_f_1_4_Series_1.html
Note that only the Pentax mount one there has a "A" setting on its manual aperture barrel, other re-brand equivalents I've seen available on the 'net lack this often desirable for Pentax, while some appear to lack an aperture ring all altogether.
(sorry I can't locate an example at present, eBay have shitloads of these no-names too)
Other brands can be: Bower, Samyang, Vivitar, Rokinon, Falcon, Polar, Walimex, Opteka, ???
Anyway, to get to the point; if and when buying a "bargain" lens in this field make sure you pay attention to the small details like that, function that you might need (or possibly regret later if you don't have). Might pay to confirm with any vendor before throwing money at them.
Also, if you're into Bokey [sic], then this page & utility might interest.
http://www.physics.mcmaster.ca/~syam/Photo/bokeh.html
Fwiw v2: Samyang have a fast 35/1.4 in their brewing pot too which could cause big waves:
http://www.samyang.pl/product,156,category,5,samyang_35_mm_f14_as_umc_availa..._february_2011
HTH.
.R.