The PX13 mercury cell used to be common in lightmeters and for powering exposure meters in several diverse cameras. The MRB625 is a direct replacement and being Zinc/air it is almost environmentally friendly. The problem is this Wein Cell is the only direct replacement I have found and they are expensive at £8.00p a pop delivered. I got to thinking and borrowed a 675 hearing aid battery. These are much smaller in diameter about 4.5mm smaller and their voltage is 1.4v as against 1.35v. I had a root through Ken’s big box of small “O” rings and found one that was about 2mm diameter that fitted over the battery and dropped it in the camera. The meter works fine and I wondered if it still read the same despite the 0.05v difference. It appears to, hearing aid batteries are cheap as chips and what is more they are available everywhere with the exception of fishmongers, pubs, butchers, animal feed suppliers and greengrocers. I suspect the folk that are interested will have realised all the above and those that aren’t will not give a Tinkers Toss.
Here are a few photos from this week, they are as normal as I get.
The Edge of the Forest.
What the Butler Saw.
My cameras are not peeping perverts so I opened the door and we can now see it all, whatever it is. I have several of these shapes and the holders for them they definitely work on a 62mm lens thread but aren’t very big so much more and you may have to crop. They are free to a good home. There are arts, I mean Hearts, keyholes, a funny figure of eight shape and plenty of random squiggly shapes. They come with a wonderful holder that sort of screws into the lens with the adapter included and then folds out to accept the filter. Excellent value for nothing.