Before getting started i d like to mention that this only covers a small sample of the total number of good astrophotography lenses out there.
Rokinon 16mm f 2 0 full frame.
Optically speaking the rokinon 16mm f 2 is excellent but only in a narrow range like f 4 5 6 stopping down to f 8 or smaller results in serious diffraction and makes the image look soft.
Until now if you wanted a lens faster than f 2 8 and wider than 35mm your only options were the expensive 24mm full frame primes used on full frame cameras.
Stopping down to f 2 8 makes a significant improvement in sharpness especially in the center of the frame.
The 16mm f 2 0 ed as umc cs lens from rokinon is a manual focus wide angle lens compatible with aps c format dslr digital cameras.
Another couple inches of length are added with the hood but only about an ounce or so of weight.
At wide apertures like f 2 2 8 the image is also soft even in the centers which i didn t expect.
Here i ve tested five popular wide angle lenses for astrophotography.
Can properly cover full frame sensors equivalent in size to 35mm film 36 x 24mm as well as smaller aps c and mft size sensors.
Aps c dx 77mm.
It provides a 79 5 angle of view which translates into a 35mm format equivalency of 25 6mm.
The 16mm f2 0 ed as umc cs 499 is just one in rokinon s line of affordably priced manual focus lenses for slrs and mirorless cameras it covers a very wide field of view and opens up all the.
Focus is achieved without any lengthening or rotation of the front lens element.
Click here to view a larger version the rokinon 16mm f 2 is a very special lens because it is one of the first wide angle fast aperture primes ever made specifically for aps c crop sensor dslr cameras.
How do they compare.
A fast maximum aperture of f 2 0 is effective in low light shooting and provides shallow depth of field.
The 16mm f 2 0 ed as umc cs lens from rokinon is a manual focus wide angle lens compatible with aps c format dslr digital cameras.
Mf digital photo.
3 27 inches 84 millimeters wide 3 42 inches 86 millimeters long with a moderate weight of 20 ounces 571 grams.
The center of the frame is very sharp at f 2 8 and even slightly sharper at f 4.
A fast maximum aperture of f 2 0 is effective in low light shooting and provides shallow depth of field.
The samyang 16mm f 2 lens is slightly soft at f 2 but rather evenly so across the entire frame.
