Well today the Peleng 8mm/3,5 Fisheye arrived from Belorus.
I ordered the lens from East Wave Products that is based in Ottawa but the lens is sent from Belorus. I ordered mine in Pentax K mount. No adaptors necessary.
Ok, enough with the chit-chat. I know what everyone wants to hear.
The Peleng 8/3,5 Fisheye works perfectly with a Pentax MX
At infinity, the mirror does come close to the rear element but there is more clearance than I anticipated.
Also, many articles on the internet state that the front cap pops off easily. Perhaps the manufacturer made some improvements since those articles were written. Mine front cap stays in place. The lens is solid and heavy and everything is smooth. I did find a little flex in the k-mount. Perhaps tightening the three screws holding the mount in place will fix that. Overall this lens is a really sweet piece of glass.
I can't wait to use this lens. Thanks for the help guys.