The M42 Lens to Sony E-Mount Camera Lens Turbo Adapter Mark II from Mitakon allows M42 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.

The four optical elements of the Lens Turbo adapter condense light from the M42 full frame lens and project it onto the camera's APS-C sensor allowing the sensor to capture all of the lens' transmitted light, negating the 1.5x crop factor and effectively producing full-frame coverage on non-full-frame sensors. A corresponding increase in the maximum aperture of 1 f-stop makes the lens more effective in low-light situations.

The Mark II version of the Lens Turbo features an improved design to produce sharper images. Its rectangular rear lens rests closer to the camera's sensor improving light transmission and an enhanced lens coating minimizes ghosting and flare. One extra-low dispersion (ED) lens element reduces aberrations for better delineated images. The adapter offers a sturdy metal construction and stainless steel mounts, it attaches to both camera and lens with little play and includes a front and rear protective cap. The Lens Turbo is a manual adapter offering no electronic communication between lens and camera.

The Lens Turbo adapters are compatible with APS-C sized sensors. Although they will physically fit the Sony full frame mirrorless cameras, the camera must be set to Crop Mode to fully support the speed booster's functions.

M42 Lens to Sony E Camera    Widens Angle of View by 0.726x    Increases Maximum Aperture 1 Stop    One Extra-Low Dispersion Element    Enhanced Lens Coating Reduces Flare    Rectangular Rear Lens Reduces Reflection    Manual Adapter

Allows M42 lens to be mounted on Sony E-Mount (NEX) camera

Increases the angle of view by 0.762

Increases maximum aperture by 1 stop

4 lens elements in 4 groups including 1 extra-low dispersion element

Optimized lens coating to reduce ghosting and flare and improve over-all image quality

Related Questions and Answers

Q: 1. Does this adapter allow m42 lenses to focus at infinity? Or is infinity focusing compromised turning the lenses to macro-like close focusing lenses?

A: The adapter does have infinity focus but it does not work with every lens. Lenses with protrusion beyond the mount by 3mm or more will not work.

Q: 2. Will auto focus function on Pentax lens work with this adapter on Sony E mount full frame camera?

A: No, this is a manual focus adapter only.

Q: 3. Is the lens element inside adjustable to fine tune infinity focus?

A: Unfortunately, the lens element within this adapter is not adjustable.

Q: 4. Is it correct for olympus em5 mk2?

A: Yes, this is compatible with the Olympus EM5 mk2.

Q: 5. Does this adapter have a cropping effect when used on a Fuji camera?

A: No, there is no cropping effect on a Fuji camera.

Q: 6. Will this fit a Black Magic Pocket Cinema Camera?

A: Yes, this is compatible with the Black Magic Pocket Cinema Camera.

Q: 7. 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.

A: Yes you can change the f/stop on the lens if the lens has an f/stop ring.

Q: 8. 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?

A: 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.

Q: 9. Does this work for a Helios-44-2 lens?

A: The Mitakon Zhongyi Lens Turbo Adapter V2 for Full-Frame M42 Mount Lens to Fujifilm X Mount APS-C Camera will work with a Helios 44-2 lens with an M42 lens mount.

Q: 10. does this work for the super takumar 50mm 1.4 ? i cant find any exact details about this

A: Yes, it will.