Sorry to disagree Warren but while the glass grinding might be perfect (it is.....) the glass spec was not, hence the refractive index per lens (and there's 4x lenses per ocular set) was not to the spec. Easy to illustrate using a spotlight and a black board


Please demonstrate this as I would love to see it, probably along with a number of others...
Of course you cannot mix Brit and Cdn lenses that is a give. BUT" sometimes ya get lucky" and get a decent match.
Flint glass, crown glass and the Canadianicon Balsam used as the glue all have a slightly different refractive index, batch to batch.
That is a given. When originally making the scopes the maker had a lot of choice in assembling matched couplets and the use of a focimeter/lensometer.
I am waiting with baited breath for the lens demo with the flashlight and blackboard as I know several others will be as well.
Perhaps a short video is in order.
The optical engineer who helps me on occasion and I know he would probably be interested as well.
I have some great info from him that some of which I cannot understand and I will send it to you and I am sure you can help us all by an explanation of it, as you taught it.
Anything I can learn on the subject of the theory of simple and complex lenses is more than welcome. The mathematics and forumuli just kill me. I even built an optical bench to work at it.
The mechanical end is rather straight forward, but lens theory is a real bald spot scratchier...for those of us who are folically efficient. And, for us more mature guys.
Many of us who repair the No. 32 keep in touch with each other and share parts back and forth. Even with the exorbitant price of postage, now we manage.
Appreciate the offer of the blackboard tutorial and as most mobile phones have video clip of up to 30 seconds and more it will be a no brainer to post it here.
Hopefully, without overstepping any bounds here, if someone needs No.32 parts just ask, I just might have it.