Any specs for old ASV Chance glass?

[Brub58 (Bruce)]

Several years ago I picked up two pieces of optical glass from the ASV with the view to making a refractor. However life got in the way and they've sat in the bottom drawer for about 6 or 7 years. I've pulled them out to start this project again, but no longer have any specs for them.

The makers name is faded but I think it says Chance Optical Glass - I can see the "Ch" and "e" and maybe a faint "an" in the middle. They are labelled EDF 42553 and BSC 38853. I also have two templates I made, one is 422mm radius and the other 598mm radius.

Would any ASVers out there happen to still have specifications for these glasses? Google seaches have yielded nothing on these numbers. I'd love to put them into OSLO and see what I can do with them rather than just using the templates.

[dannat (Daniel)]

I would go to e bistro making section meeting at the clubhouse they will know something

[Brub58 (Bruce)]

Just to close this out, since no-one here had any information I turned up at the Instrument Section meeting on Saturday. The numbers on the glass are not catalogue numbers but batch numbers. You have to find the right batch number on the little bit of paper in the old ammunition box the galss is stored in to get the actual catalogue number.

The crown is BSC 518646 and the flint is EDF 653335.

I also got a nice design for an f/10 that Stefan had done about 15yrs ago and he verified on ZEMAX while I was there, but I've reduced it to f/8 for a small, low power scope.
r1=457.5, t1=12.0
r2=r3=-352.5, t2=0 (no air gap),t3=6.5
r4=-1280