IR sight on MiG-21PFM?

Samotsvet

IR sight fitted to VVS MiG-21PFM, next to the ASP-PF gunsight. It was intended, in conjunction with the radar and gunsight, for the detection of target aircraft in tailchase engagements and employment of all types of weapon at night and at all altitudes.

Found this in a Russian-language website, never heard of it. Anyone got a cockpit shot of a russian PFM to look at?