Tiffen 100x100mm (4x4”) Polarizer console It's possible that it's some

It's possible that it's some kind of reference to the internet (the design is very early-2000s) but I don't know what this bag has to do with the internet other than the fact that you're reading this description

and a piece of IR filter is taped to the front of the lens: looks a bit dodgy

C Kaligar 80mm f3

5 DC is an ultrawide lens for Pentax K-mount crop-sensor digital cameras

This XPROB version features a centre column that can be flipped horizontally (for close-up or copystand use) without removing it from the tripod

Tiffen 100x100mm (4x4”) Polarizer console It's possible that it's someA classic Tiffen polarizer in 100mm (4x4") format, for use in matte boxes or filter holders (sold separately). Excellent condition, with pouch.