with the proliferation of low cost, low drop out voltage regulators, I'm surprised that nobody has come out with a simple electronics based replacement. One would only need a 3.0v lithium cell, a 1.35V LDO regulator and a few discrete components. I've plans to retrofit the low voltage side of my Pentax Spotmeter with such a circuit but powered from the 9V battery that's already there...just haven't "got around to it" yet.
Such has been proposed and done. For instance with the microchip TC1015 for devices running on two mercury cells.
However this chip necessitates a on/off-switch, otherwise it would drain the battery itself.
.....But that is the entire history of photography.Minolta 70, needed the autofocus. Don’t understand how others go about with manual focus and exposure.
Pentax K1000. After high school and going to community college in 1992.
I still have it and it still functions but the mirror has some kind of funky black stuff in it that won't wipe off. Resembles sort of like webbing or a cobweb type of effect? Doesn't appear to be a scratch and I am not sure why there would be anything in the mirror system because I had it put away safely in storage, or so I thought. I am tempted to put some lens cleaner on the mirror but I am thinking that might not be as good of an idea.
While I sold that FTb to KEH in 1995, a GAS attack a few years ago found me bidding on a good-looking early FTb (serial number 151xxx) that has a Bell & Howell plate riveted in its film chamber. After winning the auction (no other bidders, if memory serves) I sent it to Garry's for service, and am happy to once again have an excellent example of this landmark camera.
The mirror in an SLR is a front-silvered mirror, meaning the top surface has the mirror coating, which is why camera makers caution the user so strongly about not touching the mirror surface. But what you're describing almost sounds like fungus, which is typically found within lenses or sometimes camera pentaprisms.
I have had to clean mirrors on occasion and I think that if you're careful about it you can do it too. Get a soft Q-tip and the lens cleaner you mention, saturate the Q-tip with the cleaner and then very lightly wipe down the mirror surface with the Q-tip. Don't go back over the mirror repeatedly. Just single passes, however many it takes to wipe the entire mirror. And let it dry. Then examine the results. I don't think you're gonna see any difference, but at least you will have cleaned any accumulated dust and whatever from the surface. Even though your mirror has these strange traces, they won't affect your images and I doubt they will even affect the way the images appear in the viewfinder. That's the good news, at least. If this stuff is fungus, you might want to leave the lens off and expose the camera to a strong UV light source -- like the sun -- for a few hours. This will kill the fungus, if that's what it is.
.....The FTb was the camera that taught me photography. I bought my first copy in 1984 and used it thoroughly for several years. I now own three of them -- two chrome and one black. Brilliant in its simplicity and function, to this day it remains one of my all-time favorite cameras (although I prefer the FTbn, the later one with the plastic tip on the film wind crank, slightly redesigned shutter speed dial, and later style self-timer/stop down lever).
...
The competative price for the SPF combo was, as honestly explained to me by the sales guy, due the the coming introduction of the bayonetted Pentax K cameras.
/Per
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