Opteka 6.5mm f/3.5 Professional Ultra Wide Angle Aspherical Fisheye Lens for Canon EF-Mount EOS 90D, 80D, 77D, 70D, 60D, 50D, 7D, Rebel T8i, T7i, T7s, T6s, T6i, T6, T5i, T5, T4i, T3i, T3, T2i and SL3

I've had this product for less than 3 days. I was originally looking for a ultra wide angle lens for mostly night shots. I was looking at buying Rokinon 14mm but the price point at this time was not something I was willing to pay.I purchased this lens as an alternative and I am using it with my Canon t4i.First impression, its a hefty lens, but it does feel nice. The build actually feels like it could take some knocks and keep up which in my case is good since i've been out in the forest and on mountains with various lenses. It's a manual lens but its not the hardest lens to figure out. Focus ring seems near useless, if you are a beginner you won't notice much of a difference with a twist of the ring.I haven't had a chance to go out in the day and use it but just from in home testing it feels like it could handle any situation. In the night, it handled nicely enough for me. The image I provided was from a rest stop outside of Flagstaff. It's a stock image with no editing, I had it on the highest ISO with a 30 second exposure. Flagstaff is a heavily light polluted area so you can see it picked up the town lights unfortunately but expectedly. It did pick up the milky way which is something I was striving to do and could not do with my previous lenses.All in all I like the lens, I would recommend it for its price and build, if you are a beginner its going to be a fun lens in your arsenal to learn and build alongside. If you are professional, it will seem novelty, but it may prove useful for some urban/street settings.

I have a Canon t6i and typically use and love shooting a 10mm-20mm lens but thought I'd try something a little wider. I figured I'd roll the dice for $160 and give this lens a try. I thought I really wouldn't use it much so I didn't want to plop down a lot of cash. I've had it for about a month now and not only love it but use it all the time. Let me break it down #1 for $160 it's a great lens and my only regret is that I didn't buy it sooner. #2 It is fully manual so you have to manually focus it, but since it's so wide you will find that you will pretty much use two focus points: 1 ft for everything between 1 and 5 feet away from you, or infinity for everything else. Pretty much everything is in focus using that approach so you really don't have to mess much with the focus and my concerns about not having autofocus turned out to be a non-issue. #3 It has a manual aperture so the Auto, Program, or TV mode on your camera won't work. Again just set your camera to AV and set the aperture with the ring and it all works very easily and well. And of course you can shoot manual #4 it is a fisheye so if you will get bending in the picture. If you keep the camera parallel to the horizon on a landscape shot you won't notice it and you will get some amazing wide angle shots. If you point the camera up or down, or you are close to walls you will see the bending but it's actually kinda cool. I included some photos where I had the camera horizontal and where I tilted it for a curve effect so you can see for yourself #5 The optical quality is fine. Sure it's not a $5,000 lens but for image quality it's just as good as any lens I have that I've paid $1,500 or less for. #6 Construction, aperture, and focus rings are solid. The lens cap is a little tricky to figure out but once you do it's easy to take on and off and it stays on firmly. I wear my camera on a belt holster so losing lens caps is a concern for me. This one stays on just fine.

I have had this lens about 2 months. I've used it 4 or 5 times. The results are quite good for a lens retailing for under $200. As others have noted, the build quality is not superb, but it felt and functioned like a reasonably sound piece of gear, though the f/stop ring has been "sticky" since I got it.This Tuesday morning, while shooting the eclipse of the moon, I found that the internal rectangular mask had rotated about 50 degrees. This results in part of the image being blocked from the camera sensor, and renders the lens useless.If the lens had not failed physically, I would have rated the performance a 4 as good-for-value performance for a low cost lens.I've contacted the seller, but so far based on this failure my purchase has been a waste of money, and rates a 1.UPDATE: Two weeks and two emails later, the only response from 47th Street Photo has been one automated response that they were "closed for a holiday". Disappointing. I have now contacted Opteka to see how they honor their 1 year warranty.UPDATE: I gave up on 47th Street photo (they never did answer my queries.) HOWEVER Opteka warranty service answered my email within a day. I provided proof of purchase and had an RMA the next day. About 10 days later I have a replacement lens, which works great. I'm increasing my review to 4 stars.UPDATE: Sept 2019 - I am still happily using this lens for night photography. In Lightroom I use the Rokinon 14mm/f2.8 lens correction option since there is no Optika setting - it works fine. Because of the f2.8 aperture it is possible to get reasonably exposed images in 15-25 seconds, keeping the star-trail problem to a minimum on my canon 5DSR (full frame). I've attached two images from a recent trip to Glacier National Park as examples.