Solar 250 45 or 60 mm lens

[Barney]

I've recently bought a second-hand Optikinetics Solar 250 Effects Projector, supplied with the standard 85 mm lens.

 

The image diameter is a little on the small side for the throw (about 3 metres) and I'm looking at the 45 mm or 60 mm lenses as alternatives for a larger beam angle (although not sure the 45 mm is available for the Solar 250?).

 

Does anybody know if there are any alternatives to the Optikinetics branded lenses that will fit into this projector? As the 60 mm lens is £43+VAT, I was wondering if there are any cheaper options before I splash out B-)

 

Cheers,

Barney