Need help to ID prism & req battery

[jeff]

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Hello.. I would like your help in identifying the prism shown at the above link as well as the battery required.. I know the original mercury battery is no longer made, what I am looking for is the generic, close enough, replacement.. Your help would be greatly appreciated.

Thanks,
Jeff

 

[qnu]

That is the first version Hasselblad TTL-metering prism.
It indeed takes now no longer available 625 mercury batteries. There are no other 'real' batteries that have the needed constant 1.35 V presently available.

Zinc-air cells /Wein cells can be used, but the fit is terrible (they, replacements for the smaller 675, need a ring to keep them in place, but there's not a lot keeping the ring itself in place...), and so is their life span.

There are however contraptions that 'adapt' a SR44 Silver Oxide battery.
These adapters are sold ready-made, and there are instructions on the web how to make such a thing too.
And, though the battteries do not last as long as the original ones, they work fine.

 

[jeff]

Thanks. Would you be able to point me to one of these adapters?? It came with one but it's a sloppy fit on the battery. Jeff

 

[qnu]

Jeff,

I remember a dutch Rollei-club/user site hosting a PDF.-file with a discussion of battery options, how to make an adapter yourself, and where to get ones ready-made.

I purchased adapters on eBay, where they pop up now and again.

I'll have a look around and see who's ofering what and where.