Tip for connoisseurs (and Patient)

OK, added: the tip is Sooo secret no longer now. :)
I bought December 2014, due to enthusiastic reports on the net that for my Mitakon A7s. Back then, for about 750 directly from England, now (Feb 2015) prices have risen sharply due to high demand, as long as the light giant is getting ever.

50mm / f0.95ja, you read that right: aperture 0.95. These are the brightest full-frame optics that there are - more than twice as sensitive to light as a 1.4er lens. Of course, requires the focus at 0.95 a lot of practice and patience, but the results are exceptional and a number of its own. The focus is in the center good to very good, as long as the focus sits even at full aperture.

Here, of course, the ghosts: who actually preferred autofocus and manual focus anyway devotes only frowning, will not be happy with the Mitakon and need not continue reading here.

All others I would recommend at least to give it a look. Thanks to the focus peaking, which now have all system cameras with electronic viewfinder (the Mitakon seems due to design anyway not to be made for conventional DSLRs), the focus is child's play. The same goes for fast lenses at full aperture - but here is a prerequisite that the object holds still and the photographer does not fluctuate, the sharpness level at F0.95 on full frame is in fact tiny, I guess about 1cm or so. So action shots are only possible if one can live with 99% wastage. :-P
So there are obstacles on the path to great photos. Would have been nice if you'd have to press just once just briefly rotating the focus ring and the shutter button. :-)

Nevertheless, it is worth it!

Two warnings but would:

a) The lens is good processed and relatively compact (I have the revised version 2 with the catchy name of "Dark Knight"), but thanks to solid metal and plenty of glass pretty hard, about 720g. And it's relatively light spill prone, so be sure to use the supplied lens hood.

b) Be careful, the lens can be addictive if you get along with manual focus! The rejection rate in F0.95 may be high, but the results speak for themselves. The bokeh (background blur) is mostly soft and like much.

From me, there's a clear recommendation that Mitakon is a very special appearance with private (and sometimes unruly :) character.

I'll upload two or three images and make even a link with another sample images in the comments for review.
If you want more information: On Youtube also several reviews there.