My rating does take the low cost of this lens into consideration. If though, you want an ultra wide lens that's cheap and, with a little work and PP, can deliver some decent and unusual images (I'd avoid f/3.5 as much as possible) I think it's worth the very small investment. My conclusion is that if you're a pixel peeping addict who just can't let it go in ultra wide images you may want to pass. The color and contrast very closely match the actual scenes. This one at f/5.6, the sharpness improves a lot. Just had to do the brick wall, these are at the MFD.
This one is at f/5.6, the sharpness improves a good bit and the CA is less obvious but still there. This one is at f/3.5, nothing is all that sharp and there's heavy CA, especially in the branches in the upper right. Depending on the lighting, there's a lot of CA at f/3.5, this too improves at f/5.6 but is still visible in the 2 images below. Opteka 0.20X Professional AF Fisheye Bundle with Microfiber and Lens Pen for Canon EF EOS 80D, 77D, 70D, 60D, 50D, 40D, 7D, 6D, 5D, 1Ds, Rebel T7i, T7s. Taken with a Nikon D40, fitted with a Nikkor AFS DX 18-55mm F/3.5-5.6G II lens fitted with an Opteka 0.35x Semi-fisheye Converter, and processed in GIMP. Opteka Opteka 37mm 0.3X High Definition II Ultra Fisheye Lens for 25mm, 30mm, 30.
OPTEKA FISHEYE MANUAL
Opteka Opteka 12mm f/2.8 HD MC Manual Focus Prime Wide Angle Lens for Fuji X 199.00. Wide open, images are pretty soft in the center and a little softer as you move towards the edges. Opteka 6.5mm f/2 HD MC Manual Focus Fisheye Lens for Sony E Mount APS-C Format Digital Cameras 199.95. Focusing at the MFD gets a little more difficult if you want the sharpest possible images. The MFD of this lens is 11.8 inches presenting some interesting possibilities. This is a manual focus lens, the depth of field is so deep that even at f/3.5, if you use the distance scale to pick the approximate critical spot you'll be good.
OPTEKA FISHEYE INSTALL
The hood can be removed but you need it in place to install the cap. Another fixed position between f/3.5 and f/5.6 would have been nice however there is room to position the ring between these stops but you don't know exactly what your getting. The aperture ring has fixed stops at f/3.5 and f/5.6 then every 1/2 stop to f/22. The build quality is quite good, metal mount and barrel with a large, smooth operating rubber focus ring. This is a manual APS-C lens with a 180 deg. I've been wanting an ultra wide lens for my APS-C Canon 90d and found the Opteka 6.5mm f/3.5 lens on sale for $140 USD.
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