Baltic or Finnish Baltic Birch for lens boards?

[Tin Can]

Baltic Birch Plywood, 3 mm 1/8 x 8 x 8 Inch, B/BB Grade Sheets| Woodpeckers

https://www.ebay.com/sch/i.html?_fro...8%22&_osacat=0

eBay

Look it up

Been using it for years, I glue up for rebate

[erie patsellis]

Also search for apple ply or euro ply, all very similar, though subtly different

[Tin Can]

Looks good to me

Thank you

Also search for apple ply or euro ply, all very similar, though subtly different

[Drew Wiley]

Apple ply is really a soft-core laminate intended for drawer sides, etc, and of premium price because it is free from the routine formaldehyde glues generally necessary for denser materials. I have used lots of it for other things, but wouldn't include it in my own list of suitable materials for a lensboard.

[John Kasaian]

The 4x4 boards for earlier Speed Graphics and Graphic View 2 is the "A" board.
Sometimes they show up on eBay.
Good Baltic Birch is common in amateur aircraft building.
The OP might luck out finding some scraps from an Experimental Aircraft Association (EAA) member.
Take a field trip to a civil airport and talk it up with the Fixed Base Operators (FBOs)