Lunasix 3 black version, what batteries?

[Nokton48]

I use the MR9's (two of them) in my Olde Sinar Sinarsix TTL Meters, I have four of them around. They do work with these MR9's, which is amazing to me, but the Olde Lunasixes are still deadly accurate

 

[Helge]

@wiltw (post #23) can give more details as he is (one of) the people I was mentioning who bought this:

MR9 MR-9 PX625 PX13 Battery Adapter for Film Camera & Exposure Meter / Mercury | eBay

Price is for one adapter only. Use of 386 / SR43W Silver Oxide battery (1.55 V) to.

www.ebay.com

Here is what I bought and using productively:

MR-9 Mercury Battery Adapter

Our mercury battery adapters are the perfect solution for vintage collector cameras and equipment that were designed for use with mercury batteries.

shop.criscam.com

There are others on ebay that ship from Japan and priced somewhere in between. Ironically, they all look the same... and maybe they really are all the same. As long as one doesn't make the mistake of buying the much less expensive adapters that do not do voltage reduction. As mentioned above, shipping from wherever to wherever is very costly, especially for small items.

For me these adapters are worth the price as they enable use of old gear without fiddling with modifications or short-lived zinc-air cells. I use them in a Sekonic Luna Pro, Richol Singlex TLS (my most hated camera but it is an heirloom so I use it anyway), and in the past in Canonet. They provide good and reliable service but, as you say... at a cost.

They all seem to end up at the same price of around $66 for two (if you don’t actively choose to pay more).
Might as well go with the proven MR-9.
I have a feeling someone somewhere is making a pretty penny on these.

 

[wiltw]

@wiltw (post #23) can give more details as he is (one of) the people I was mentioning who bought this:

MR9 MR-9 PX625 PX13 Battery Adapter for Film Camera & Exposure Meter / Mercury | eBay

Price is for one adapter only. Use of 386 / SR43W Silver Oxide battery (1.55 V) to.

www.ebay.com

Here is what I bought and using productively:

MR-9 Mercury Battery Adapter

Our mercury battery adapters are the perfect solution for vintage collector cameras and equipment that were designed for use with mercury batteries.

shop.criscam.com

There are others on ebay that ship from Japan and priced somewhere in between. Ironically, they all look the same... and maybe they really are all the same. As long as one doesn't make the mistake of buying the much less expensive adapters that do not do voltage reduction. As mentioned above, shipping from wherever to wherever is very costly, especially for small items.

For me these adapters are worth the price as they enable use of old gear without fiddling with modifications or short-lived zinc-air cells. I use them in a Sekonic Luna Pro, Richol Singlex TLS (my most hated camera but it is an heirloom so I use it anyway), and in the past in Canonet. They provide good and reliable service but, as you say... at a cost.

Look for key verbiage in the product description, often not seen in the title:

"Use of 386 / SR43W Silver Oxide battery (1.55 V) to convert voltage to be equal to obsolete Mercury battery (1.35V)."​

​

Both of Brian's links are to products which do the right thing!
It seems that the ones under $20 are the physical adapters for air cells, which do NO Voltage conversion.

 

[Helge]

Look for key verbiage in the product description, often not seen in the title:

"Use of 386 / SR43W Silver Oxide battery (1.55 V) to convert voltage to be equal to obsolete Mercury battery (1.35V)."​

​

Both of Brian's links are to products which do the right thing!
It seems that the ones under $20 are the physical adapters for air cells, which do NO Voltage conversion.

There is always the option of using two of the expensive adapters. But that’s about plus $70 in Denmark.

Numerous places on the web mentions that the black version in particular was made for use with silver oxide batteries.

I don’t know about the 3s version.

I guess people back then had qualms about using mercury cells, or thought they were too expensive?

I was after a cheaper/elegant solution. Appears the MR-9 adapters we’ve had for years is about as good as it gets.

Soldering a diode into the battery wires of the meter is simple.
It’s disassembling and assembling the meter correctly that is the hard part.
I’ve had my go at a few broken Gossen meters for the fun of it. And it’s actually surprisingly difficult!