1940s Leitz objectives questions

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brettpim
Posts: 75
Joined: Thu Mar 26, 2015 7:09 pm

1940s Leitz objectives questions

Post by brettpim »

I have a Leitz Ortholux from the 1940s. It has the following Leitz objectives:

- 1h 3,5:1
- 3 A=0,25 10:1
- 6a
- 1/12 Fl oel A=1,32 95:1

I know that the A values are apertures and the ratios are magnifications. I think the "Fl" mean suitable for fluorescence. But what do the following mean?

- 1h
- 3
- 6a
- 1/12

Alan Wood
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Re: 1940s Leitz objectives questions

Post by Alan Wood »

1/12 is probably the focal length in inches, roughly 2 mm, about right for a 95× objective.

Alan Wood
Last edited by Alan Wood on Wed Oct 13, 2021 10:39 am, edited 1 time in total.

Duke
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Re: 1940s Leitz objectives questions

Post by Duke »

N:1 meaning magnification of the objective is N times i. e. 3.5:1 -> 3.5x.
Short numbers with letters '6a' on the older objectives now essentialy meaningless, it's a catalogue number, usually though higher number stands for higher power (magnification). On the older brass-era scopes objectives were marked just "1","2","3","4" etc, meaning the order as you go from lower to higher magnification. I would guess that "6a" is actually ~40x objective.
“Thoroughly conscious ignorance is the prelude to every real advance in science.” - JCM

brettpim
Posts: 75
Joined: Thu Mar 26, 2015 7:09 pm

Re: 1940s Leitz objectives questions

Post by brettpim »

I have attached the objectives to a Leitz Ortholux and using a stage micrometer and reticle I can confirm that the objective labeled "6a" has a magnification around 43x.

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