The new Samyang AF 12mm F2 is an autofocus version of this formula for Sony E-mount (APS-C mirrorless), and also comes with a new build and fresh design language that is slightly different than anything I’ve seen from Samyang before. It’s great to see Samyang give some fresh love to APS-C, and the 12mm F2 gives an approximately 18mm full
APS-C Speed Booster Nikon F Manual Focus Lens Adapters. Speed Boosters are 0.71x focal converters that reduce a full-frame image to APS-C. They’re compatible with Sony APS-C mirrorless cameras including a5000, a5100, a6000, a6100, a6300, a6400, a6500, a6600, FX-30 and NEX.
A 50mm lens focused at infinity has a horizontal field of view of about 39.6 degrees for a full frame 35mm camera. For the same 50mm lens focused at 0.55m the magnification is 0.1 and the field of view narrows to 36.2 degrees, so you can see that even for pretty close focus (0.55m is under 22"), the FOV doesn't change much.
At the end of the day, there is one and only one implication of the crop factor: the field of view is narrower on APS-C compared to full frame given the same lens. The crop factor itself is found by dividing the length of the diagonal of the 24 x 36 mm sensor (43 mm) with the length of the diagonal of the APS-C sensor (28.8 mm): 43 / 28.8 = 1.5. AjAwn.