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Opteka 6.5mm f/3.5 HD Aspherical Fisheye Lens with Removable Hood for Canon EOS, Nikon, Sony Alpha, Olympus, Pentax DSLR Cameras

With the addition of the Opteka 6.5mm f/3.5HD Aspherical Fish Eye Lens to your camera bag, you’re entering a whole new world of highly creative executions that run of the mill lenses just can’t match.

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Product Features

  • High resolution, manual focus digitally-optimized fisheye lens
  • HD, super multi-coated optics reduce lens flare and ghosting while ensuring very sharp images
  • Aperture Range, F3.5 ~ 22 12 inch minimum focusing distance for incredible close ups
  • Ultra-wide 6.5mm focal length
  • Minimum Focusing Distance 1 ft. / 0.3m
  • Length 10cm / 4 in.
  • Weight 14.6 oz. (414g)
  • 10 Elements in 7 groups (1 spherical lens)
  • Removable hood allows for full 180˚ views and stunning panoramics
  • Includes: Opteka 6.5mm f/3.5 Circular Fisheye Lens, Front & Rear Lens Caps, Lens Pouch


DMC - (Digital Multi-Coated)

Greatly reduces the appearance of lens flare and ghosting caused by reflections.

BAB - (Internal Black Almite Barrel)

Black matte satin finish which reduces reflections.

BRG - (Black Rimmed Glass)

Reduces the chance of light reflecting off the edge.

Lens Construction: 10 Elements in 7 Groups

Angle of View: 180 degrees diagonal

Aperture Range: F3.5 ~ 22

Minimum Focusing Distance: 1 ft / 0.3m

Length: 10cm / 4 in.

Weight: 14.6 oz (414g)

MTF Chart

MTF (Modular Transfer Function) is one of the measurements that evaluates a lens' performance, and it contrasts sensitivity at different spacial frequencies.

The horizontal axis is in millimeters and shows the distance from the center of the image toward the edges, and contrast value (highest value is 1) is shown in the vertical axis. The readings at 10 lines per millimeter measure the lens' contrast ability (red lines), repeating fine parallel lines spaced at 30 lines per millimeter measure the lens' sharpness ability (blue lines), when the aperture is wide open.

Fine repeating line sets are created parallel to a diagonal line running from corner to corner of the frame, are called Sagittal lines (S) and sets of repeating lines vertical to these lines are drawn, called Meridional (M) line sets.

All the advantages of a wide angle lens, without the price tag

Touting a removable hood for full 180˚ field of view and complete panoramic capabilities, the Opteka 6.5mm f/3.5 HD Manual Focus Aspherical Fish Eye Lens elevates your photography to a level that far exceeds the capabilities of the human eye. Unlike a traditional wide angle lens, the fish eye will show the attractive curvature of realistically straight lines, and increasingly so towards the outer frame of the shot.

Combined with an impressive minimum shooting distance of only 12 inches, a 6.5mm focal length and a price the fraction of leading wide angle lenses, the Opteka 6.5mm f/3.5HD Aspherical Fish Eye Lens is the perfect way to expand your portfolio without breaking the bank.


What’s in the Box:

Opteka 6.5mm f/3.5 Circular Fisheye Lens

Front & Rear Lens Caps

Lens Pouch

1 Year Opteka Warranty

Additional Info

Additional Info

Name Opteka 6.5mm f/3.5 HD Aspherical Fisheye Lens with Removable Hood for Canon EOS, Nikon, Sony Alpha, Olympus, Pentax DSLR Cameras
Brand Opteka
Model # No
Condition New
Zoom Focal Lengths No
Fixed Focal Lengths 6.5mm
Lens Type Fisheye
Maximum Aperture f/3.5
Finish / Color Black
Manufacturer Opteka
Price $0.00


A lot of lens, less expensive than the previous version, and some clarifications and tipsReview by Bob
NOTE: this is the updated and less expensive version of the Opteka 6.5mm f/3.5 Manual Focus Aspherical Fisheye Lens.

At 6.5mm this is a remarkably wide angle lens. Some people (and the Amazon listing) have called it a fisheye lens and (imho) that is not correct. A fisheye is a special effects lens that is designed to make lines not running through the center axis appear curved. Kind of like taking an undistorted image and wrapping it around a ball.

Unlike a fisheye, this lens does a remarkably good job of *not* distorting the image. At 6.5 mm it will never be perfect. However, it compares to my Sigma 10-20mm zoom at 10mm (except this lens takes in a much larger area.

This lens is completely manual (and that's scary). It shouldn't be. The things I need to set are aperture and distance. To set the aperture I can use either the light meter in my camera or the histogram. A rule of thumb if you don't have a better method is to make sure the histogram line reaches almost to the right hand side. Worst case, take several pictures at different aperture settings.

Manual focusing with this lens is even less intimidating. This is due to a little something I like to call hyperfocal distance. It has to do with how much of your scene is in focus, going out to infinity. That distance increases as the aperture gets smaller (larger "f" numbers). It also increases as the focal length decreases and this lens has an absurdly small focal length.

For example, when I turn the focus ring to "1", saying the focus distance is 1 meter, at f/8 everything is in focus from 15" out to infinity. What I use as my rule of thumb is if I can touch my subject with an outstretched arm then I set the focus to 1 meter. If it takes two outstretched arms then I set the focus to between 2 and 3 meters. Otherwise it goes to a hair less than infinity.

Final thoughts on focusing, hyperfocal distance and depth of field. With a reasonably small aperture, like f/8, it's hard to avoid getting everything in focus. With a lens this "wide" it is almost impossible, even at the widest aperture, to get the background out of focus.

The lens comes with a lens hood that is intended to stay on all the time. You need it for three reasons:

- It reduces lens flare, something any lens, and especially wide angle lenses, and especially this lens with its outwardly curved front element can experience.
- It protects the front element.
- It is how the lens cap clips on.

Aside from being completely manual, which I don't consider to be a downside, this lens is *not* built like a tank. I don't consider that a downside either. This is a great lens to have when I need it and I'm glad it's not weighting down my bag when I don't. And, let's face it, for the price you can't expect a metal housing.

One final tip that applies to any wide angle lens (and especially this one because it is so wide). It's important to keep horizontal and vertical lines in your images (like horizons and the sides of buildings) horizontal and vertical. Any offset is emphasized, not so much by this lens as by the science of optics. Spending a few extra seconds making sure your camera is tilted as little as possible will go a long way to improving your images.

I was sent this lens so I could review it for you. I got a bit "preachy" because after using it I am really impressed with the value it provides. (Posted on 3/27/15)

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