Gear Talk > Third Party Manufacturers

Rokinon 14mm f/2.8

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risc32:
the camera will not know what fstop you are using, nor will it stop down the lens during exposure. you can either use it in M mode and use the force(as i do with my film cams) or set your aperture value on the lens itself, then while in a mode set it to the same, and use your camera's meter.   
 while i like to use the force, i'd probably go the "a" mode route.

mrsfotografie:
It's really easy: Put the camera on 'Aperture' mode, it will read '0.0'. Focus on your subject (wide open to get the smallest DOF for MF accuracy* and so you can actually see the DOF - an EF-S schreen really helps here). Stop down on the aperture ring to the desired aperture, half-press the shutter button to automatically meter. Shutter speed too long? Select a larger aperture or higher iso. By the way, exposure compensation also works like it should in A-mode.

I've quickly added an AF confirmation chip to mine as I've found it difficult/too slow to judge the focus/dof even with the EF-S matte screen in the viewfinder. The short focal length comes into play here - with longer focal lengths it's a lot easier to see the DOF.

I AFMA'd the chip itself (it's programmable) to give the correct AF confirmation at f/5.6. I also programmed the focal length and max aperture so these are reported in the exif. Note that when I first calibrated it for f/2.8 I found the stopped down pictures were OOF. Reason: *This lens has a focus shift when stopped down so beware of that...

Brand B:

--- Quote from: cayenne on November 20, 2012, 05:18:44 PM ---
I've just started looking at them in Aperture 3 to do a little PP..and they look great so far, exposure was pretty spot on, not much adjustments there. I've not tried to get any programs to adjust the distortion, but from what I'm seeing and what I was shooting..not really seeing any bad distortion, not like if you were shooting a brick wall where it is more apparent.

--- End quote ---


The PTLens plugin makes it really simple. Simple right-click. Only issue is it doubles the size as the result i a TIFF file.

A recent shot using mine:


282A1278 by Brand B, on Flickr

NWPhil:
Just a quick add-on:
the rokinon/bowen/samyang cannot use circular filters...but, actually it can.
by accident/experiment with my IR camera - canon 40D, I was playing with different WA and settings to get diffeent results, when I decided to hanheld a filter just in front, just by the hood. Well, happen to be a  82mm filter, and for my surprise - and a small adjustment, was able to remain by itself , grasped by the lens hood.
I am sure some difraction and reflections issues may become very visible on a regular camera, but as last resource, it might be a 'trick" worth to consider.
I think it may even take the 77mm  and maybe 72's

Other big advantage of this lens, is not having such a heavy "comma' effect as the Canon's 14mm counterpart

Standard:
I've used homemade magnetic filter foils which goes on the back of the lens mount. But after some use, I find that there isn't a need to filter it at all. An alternative method to filters is to use "black card technique."

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