"Mirror lens" capable of super telephoto with cost performance to overwhelm genuine products

With the naked eye Kenko Tokina's mirror lens that can enlarge 400 millimeters that can enlarge subjects visible only to bean grain to the frame. For Sony's E mount, about half the price of genuine products and cost performance are high and it is a powerful telephoto lens that can be used widely from athletic meet to wild bird shooting if we use it with some weak points such as not being able to autofocus It seems like "CP +I have checked its ability at the venue.

Kenko Tokina's booth is a cylindrical design reminiscent of camera lens.


The most visible model is Sony's E mount model.


"Kenko Mirror Lens 400 mm F 8 Sony E(About 20,000 yen including tax) "from the side look like this.


At a single focus of 400 mm, the F value is 8 and a little darker. There is no problem in using it for taking pictures of wild birds on a sunny day, but there are no problems in nighttime astronomical photographs etc. It is a little appreciated if it is a little brighter.


Since it is not compatible with autofocus, it is necessary to manually perform focusing.


It is about 340 grams in weight and is nearly twice the focal length when zooming in the most when "SEL 55210 (focal length is 55-210 mm)" with the highest magnification in genuine products.


"For Nikon"Kenko mirror lens 800 mm F 8 DX (around 25,000 yen including tax)There was also.


It looks bold and thick, but the weight is about 840 g and it is light as this class of telephoto lens.


Unlike a general telephoto lens, it is characterized by a mechanism that gathers light on the convex mirror at the back of the lens and then sends the light to the camera's image sensor with a reflector on the backside of what looks like a black lid at the tip. For this reason, it is not necessary to use many glass lenses like ordinary telephoto lenses, so we can realize weight saving.


The results of trying with the camera at hand are as follows. In 35 millimeters we can not see the characters on the blue sign on the other side ... ...


If you have a 800 mm telephoto lens you can come close.

Mirror lens is characterized by a slightly darker picture and features that the periphery of the picture is more easily blurred in a ring shape, but it is attractive that it is attractive to purchase lightweight and cheaper than a general telephoto lens so easily take a far object People who want to try is a product to check.