Removing much less than 1mm with a file has now fixed the problem.
OPTEKA FISHEYE MANUAL
When turned on fully tight there was still a tiny obstruction by the left hand petal that caused a "shadow" at the upper left hand edge of the image. Opteka 6.5mm f3.5 Manual Focus Aspherical Circular Fisheye Lens for Canon EF Mount DSLR Cameras Newly improved 2014, manual focus, digitally-optimized. Offering a truly expansive 180 angle of view, the 6.5mm f/3.5 Circular Fisheye Lens from Opteka is designed for APS-C-format Canon EF-mount DSLRs. I took a closer look at my lens hood today. Apparently this is a known issue with the Nikon F version.
OPTEKA FISHEYE PROFESSIONAL
I got mine in Nikon F mount, and it sits a little loose in the adapter. Opteka 0.20X Professional AF Fisheye Lens for Canon EF EOS 80D, 77D, 70D, 60D, 50D, 40D, 7D, 6D, 5D, 5Ds, 1Ds, Rebel T7i, T7s, T6s, T6i, T5i, T5, T4i, T3i, T3, S元.The rather flimsy removable hood doesn't actually go on straight as they have the alignment detents, so it gives a couple of dark corners if you don't rotate it a degree or two. The Opteka 6.5mm f/3.5 Circular Fisheye Lens offers an incredibly exciting perspective and takes photography to a range that exceeds the ability of the human eye. Compra online Opteka Titanium Series 58mm 0.3X HD Super Fisheye Lens for Professional Video Camcorders.It's basically the Samyang 8mm, and resolves just as well with excellent flare control (as your shots also prove) and just a little CA. I took it out for the first time during a recent trip to the west coast of Vancouver Island. 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. Find Opteka Fisheye Lens in Cameras For Sale.
![opteka fisheye opteka fisheye](https://d3d71ba2asa5oz.cloudfront.net/12016467/images/opteka_6_5_fisheye_fish_eye_aspherical_nov_2016_w_camera.jpg)
![opteka fisheye opteka fisheye](https://img.clasf.mx/2019/01/30/Lente-Opteka-6-5mm-F3-5-Hd-Esferico-Gran-Angular-Kit-Gratis-20190130061502.7201270015.jpg)
![opteka fisheye opteka fisheye](https://i5.walmartimages.com/asr/0c8a989f-8700-472e-bda6-0265d8c41a60_1.9dcc6b845e0a6ffb7664178538046d35.jpeg)
Never had a fisheye lens before but my wife surprised me this Christmas by going on line and buying me an Opteka 6.5mm.