Many of these kits include essential everyday lens filters, such as UV filters, which can be used during day-to-day shoots to protect your lens from scratches, moisture and fingerprints. Focus Camera has a great variety of affordable and high-tech camera filter kits by the industryвЂ™s most innovative brands, including Tiffen, Hoya, Bower, Vivitar, Manfrotto and Cokin.

the lens has considerable barrel distortion, so whether you look at FOV corner to corner, or maginfication at the center of the frame, you will have a different value related tofocal length.Each one comes with multiple (usually two or three) unique lens filters to help you color correct, diffuse light, cool, warm and add the precise desired effect to your shot. the issue of focal length is present on not just the 14/2.8 where vivitar quote 13, but also on the 8mm fisheye, where vivitar quote a different focal length.Д«ut for the 13/14 mm lens, focal length is a little subjective as to how you measure / determine it. different color stripes, different lens caps and different focusing collars. I'll be curious to know what the corners look like if I ever get to put it on a full-frame.the lenses are the same, but different.ДЇor the vivitar they are not 'rebadged' samyang lenses, but are different cosmetically. And like they say above, be prepared to exchange it (although someone also said fixing the decentering yourself is actually not hard) - my first copy was obviously decentered, my second copy was better but still 'ehhhh', and my third copy I am happy with - at least on my APS-C body. The Vivitar 13mm is the same as the others. Yeah, there are claims of an older version - someone said they had one, so I guess it exists but I've never seen it - possibly they look exactly the same. I had to replace my copy once, and the second copy is still a little decentered, but acceptable for me for now Don't know why.Д®) I would recommend the lens, as it performs very well, but listen to the above posts about decentering and focus ring calibration. Vivitar is the most suspicious, because it uses different focus grip and appearance - the other Samyang rebades are practically exactly the sameД) Sometimes the same store offers different versions of the Samyang 14mm at different prices.

Also, I haven't found any reliable source or experiment that would settle things once and for all. I haven't seen anyone complain about the Vivitar's quality, so it seems that it is not a problem. Basically, there is a high chance the Vivitar is the same as the Samyang, but I wouldn't bet my house on it. Though, I think Samyang had another, older 14mm design as well. My little theory is that Vivitar offered a different 13mm in the past and then started selling the rebadged Samyang. Someone asked the store and the store claimed they were different lenses, not just a mistake. Some time ago, a store offered two Vivitar around that focal length. there was some debate about Vivitar in the past. For example, Walimex is common in Germany)Д¬) Vivitar. I think it would cost a little more if it were made in USA. My Samyang 14mm says 'Made in Korea' on the lens. I think they are made in Korea, doubt its in USA. The photos in online stores often show the wrong lens, for example for Sony or Canon mount - and those lenses have a different mount, without A mode on aperture.Д«) Rokinon, Bower, Walimex seem to be direct rebadges of Samyang (and possibly other names as well, but Samyang makes them. A) The Samyang (and its rebaded lenses) have A setting for Pentax K.

Bower vs vivitar lens filters