Lancaster Instantaneous meniscus 8 1/4" lens

[renes]

Anybody out there have Lancaster Instantaneous meniscus 8 1/4" lens? I need to know some measurements, especially glass diameter.
VM says Instantaneous meniscus lenses were a new form and were sold with a shutter, and 8 1/4" was on list too.

[Amedeus]

I have a Lancaster meniscus lens that could possible fit the description from the VM. No shutter though. Visible glass diameter at the rear is ~43mm, at the inside ~ 44mm. THe largest iris opening is ~21mm So somewhere between f10-f11. Scale is marked in F10 to 30 with a Time scale in parallel 1-2-4-8.

Mounting thread is 53mm.

Lens is only marked J Lancaster& Sons, Patent Birmingham

[renes]

Rudi, thanks for the info, much appreciated!

I like your photos on your web.

[Amedeus]

Thanks and you're welcome