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 Replies: 52 / Views: 4,308 |
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Valued Member
United States
383 Posts |
Just a bit of info regarding typs of lens' used for magnification.
Biconvex lens: Distinguised by two spherical (convex) surfaces. Used in large field, low power reading magnifiers. Magnification usually up to 4X.
Aspheric Lens: Aspheric curves allow higher magnification with less distortion. Used by holding the more convex side (side with imprint) towards the eye. Magnification up to 12X.
Aplanatic Lens: Consists of two equally strong plano-convex lenses. The convex sides are arranged face-to-face. Full image is clearly defined and free of distortion. Magnification up to 20X. (Magnification up to 4X useful for persons with macular degeneration.)
Achromatic Lens: Top quality lens. A color-corrected lens system that guarantees a clear, sharp image. Completely distortion free. Magnification up to 25X.
Edited by Joeyuk
08/25/2006 9:00 pm
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Pillar Of The Community
3147 Posts |
Hey MM how would you like a Lincoln with a mountain range growing out of his head! Huge die break for 2006 and I have it in progression!
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Valued Member
United States
397 Posts |
quote:
Originally posted by crystalk64
Hey MM how would you like a Lincoln with a mountain range growing out of his head! Huge die break for 2006 and I have it in progression!
I think you already had some photos of that I saw last month, wasn't it? MM  |
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Pillar Of The Community
3147 Posts |
Yes, it was around that time.
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Valued Member
United States
397 Posts |
I seem to remember one of the TPG's would put those progressives in a multicoin holder,. I know I have seen a photo of some like yours (Not cents), but can't seem to put my finger on the photos of them... It could have also been on one of the coin shows where I saw them. It was like 4 coins with a progressive flaw.... MM  |
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Pillar Of The Community
3147 Posts |
That would make a pretty impressive set as not many progessions get out of the mint and end up staying together.
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Pillar of the Community
United States
7123 Posts |
Hi Terry
I would hazard to guess that not many is an overstatement!!
When all of the things are taken together that are required for a progressive set of errors to even appear and then escape the mint, and then end up in the same rolls at the same location and then into the hands of one person !!
I dont think these types of things get the recognition they deserve,, but you can be certian there are those of us out here who appreciate the dynamics .
Rick
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Pillar of the Community
United States
2177 Posts |
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Valued Member
United States
128 Posts |
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Pillar of the Community
United States
2177 Posts |
OOOOhhh. I like that one. The price is nice too. I like the desk lamp magnifier above too. I'm going to check those out when I get a chance. Thanks!!  |
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Valued Member
United States
128 Posts |
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Valued Member
United States
397 Posts |
quote:
Originally posted by thingee
The light burned out about a month. I can't figure out how to replace the bulb. Can these bulbs be raplaced and if so how
Funny you should mention that. Mine went out last night(For about the 4th time). It is a simple screw in base spot bulb, you get to it by squeezing the sides of the clear hood and it will come off. (Yes, you got to sqeeze kinda hard). Then screw out the bulb with some needlenose pliers and go find a replacement at the hardware store.  MM Edited by morganman
08/30/2006 07:30 am
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Valued Member
United States
397 Posts |
quote:
Originally posted by bryanb1
Here is the same magnifier for $12.50
http://www.widgetsupply.com/page/WS...pe/SDC3-7545
I just bought one....
Bryan
Only problem with these is they START at 60x. Much too powerful for what I want.. I love the 30x one, but cannot find them anymore. MM |
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Valued Member
United States
128 Posts |
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Pillar of the Community
United States
604 Posts |
I have a wierd magnifying glass it's the kind really really really ancient people use for reading it's shaped like a dome
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Replies: 52 / Views: 4,308 |
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Posted 08/25/2006 9:42 pm
