Beam splitter help

[RichL]

I am replacing the spotted beamsplitter in a range finder. Does anybody here know what Leitz' specs are for transmission/reflection? If not, can anybody here that has actually replaced their beamsplitter give me at least a ballpark idea of what I should be hunting for in the way of transmission?

Thanks much
Rich L

 

[Mr_Flibble]

Go for around 50/50. 75/25 will definitely not be helpful....ask me how I know. 😉

 

[je2a3]

Years ago I did beam splitter replacement on my Leica II and clones. Like Mr. F said, I used a 50/50 mirror from Edmund Scientific.

 

[RichL]

Thank you both.

Found one for $15.95 at Edmund Scientific.

75/25 works fine in noonday desert sun does it? 🙂

 

[Mr_Flibble]

I get my beamsplitter material from surplusshed.com . They have 50/50 half-mirrors sometimes (like RIGHT NOW 😉 ) and for a lot less then Edmund Scientific. You will have to cut it down to the right size yourself though.

 

[RichL]

Thanks, saw those earlier but the "seem to be" qualifier put me off. If you've them already though I guess I'll give them a try.

 

[Mr_Flibble]

It should be fine. I fixed the RF of a Kodak Retina II model 142 with it (second time round...after using the 75/25 material first 😉 ).

 

[normclarke]

You'll need 65/35 for an M leica.

Best,

normclarke

 

[Particular]

I have bought a beamsplitter mirror cut to size for Leica ltm from this seller:
http://myworld.ebay.com/nobbysparrow/
I'm looking forward to using je2a3's page as a reference when I do the work.

Normclarke, does 65% go to the viewfinder, and 35% to the rangefinder or visa versa?

 

[RichL]

Thanks for the specs.

You'll need 65/35 for an M leica.

Best,

normclarke

 

[je2a3]

I have bought a beamsplitter mirror cut to size for Leica ltm from this seller:
http://myworld.ebay.com/nobbysparrow/

Thanks for posting this link, I've purchased bits from this seller years ago and lost track!

 

[normclarke]

CNNY,
I believe we may be at cross purposes here, my figures are for the beam splitter prism for an M camera. I think the S series body's had a different set up. The 35% is the transmission figure in the main prism.

Best,

normclarke.

 

[jn053]

70/30 was the original spec for Leica screwmounts, according to DAG.