Re: Magnifying a distant image
- From: davem@xxxxxxxxx (Dave Martindale)
- Date: Wed, 25 Jul 2007 07:40:49 +0000 (UTC)
"archiees@xxxxxxxxx" <archiees@xxxxxxxxx> writes:
Hi Guys.
I have a 2 inch I.D. , 2 ft long tube which sits inside a big dewar.
At the bottom of this tube there is a 24 pin connector which has pins
made out of gold standing out. I insert a long lead with a
corresponding socket at the bottom and hence it makes connection.
Somehow the pins are not making proper connection to the socket.
Now the problem we have is that we think there is something stuck
between the pins or a couple of pins are bent, thus avoiding a good
contact. We can see using the flash light the connector down there but
it is very hard to make out if any of the pins are bent.
I feel some sort of magnifying glass which will enable us to see the
pins clearly to find out the cause of the problem. If there is
something i can buy online or from a store would be best.
I am an electrical engineer with minimal optics knowledge, so please
excuse my ignorance.
Start with a small monocular telescope, something like 6-8 power and
20-30 mm objective diameter. This is intended to focus at infinity, but
it won't focus at 24 inches unless it's a "short focus" model. To make
it focus closer, you need to give it glasses. With a +1 diopter lens
mounted on the front of the monocular, it will focus between 1 m (39
inches) and somewhat closer. A 1.5 diopter lens puts the far focus
limit at about 26 inches (0.67 m), so anything between about 1 and 1.5
diopters will work. You'll need to physically move the telescope closer
and further away from the subject until it focuses.
Now, where to get a 1-1.5 diopter lens? Photo stores carry +1D lenses
as closeup lenses. Or just get a pair of drugstore reading glasses with
+1 or +1.5 strength and pop one lens out.
Dave
.
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- Magnifying a distant image
- From: archiees@xxxxxxxxx
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