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Key Features
- Pentax K Lens to Sony E Camera
- Widens Angle of View by 0.726x
- Increases Maximum Aperture 1 Stop
- One Extra-Low Dispersion Element
The Pentax K Lens to Sony E-Mount Camera Lens Turbo Adapter Mark II from Mitakon allows Pentax K lenses to be mounted on Sony E-Mount APS-C format cameras, increasing the angle of view by 0.726x and the maximum aperture of the lens by 1 f-stop.
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question
will this adapt ricoh lenses to sony a7 e cameras, if not which adaptor does this ?
While you can use the Mitakon Zhongyi Pentax K Lens to Sony E-Mount Camera Lens Turbo Adapter Mark II to mount Pentax K-mount lenses onto a Sony a7, you would need to shoot in APS-C /Crop sensor mode. You would need to use an adapter that is designed for full frame Sony E-mount cameras if you want to take advantage of the a7s full frame sensor. http://bhpho.to/2fVNIdj
Date published: 2018-08-25
question
Can I change the F stop on my manual lens while using this adapter, or will it stay at max aperture? The aperture is changed by a ring on the lens, buts stays open for focusing until the camera closes it.
Yes you can change the f/stop on the lens if the lens has an f/stop ring.
Date published: 2018-08-25
question
Will this adapter cause vignette if using Pentax APS-C lenses, such as Pentax DA* 50-135 lens?
If you are using the lens and adapter on an E-mount camera with an APS-C size sensor camera, there shouldnt be vignetting. If you are using a full frame E-mount camera, then the Pentax lens for APS-C size sensors would cause vignetting.
Date published: 2018-08-25
Will auto focus function on Pentax lens work with ...
Will auto focus function on Pentax lens work with this adapter on Sony E mount full frame camera?
No, this is a manual focus adapter only.
Date published: 2020-09-30
question
If I use this adaptor to mount a 50mm k-mount lens on my FS7 (super-35 sensor), will the resulting focal length remain at 50mm or widen to 35mm?
Short answer: about 50mmLong answer: Super-35 has a crop factor of approximately 1.4x compared to 35mm full frame, so a 50mm lens mounted on a Super-35 sensor without intervening optics would give about the same field of view as a (50 x 1.4=) 70mm lens does on full frame. A focal reducer like this Mitakon one could increase that field of view to about 50mm. This Mitakon adapter reduces the focal length by 0.726x. I don't know the exact sensor size of the FS7 (because digital Super-35 sensors vary), but assuming it to have a 1.4x crop factor, then with the Mitakon adapter you will get a field of view equivalent to 50mm x 1.4 x 0.726 = 50.88mm on a full frame sensor.One possible caution: This Mitakon focal reducer is designed to project an image circle that does a good job covering a Sony APS-C size sensor. Super-35 sensors have a slightly greater diagonal length, so you 'might' not get good sensor coverage in the extreme corners -- I don't know and haven't tried it with the larger sensor. It works very well on my APS-C camera.
Date published: 2018-08-25