Untitled
Large RIGID Acrylic Fresnel Lens SOLAR Magnifier Oven cooker 11"x11" 280x280mm
Product Details
This is a high quality, crystal clear, large acrylic Fresnel Lens. Can be used for solar energy collection, water heating, fire starting, projection, general magnification.
Warning
This lens can be very dangerous if used outdoors. It should never be left outside and when in doors should be covered up or placed out of the sun. It can start a fire instantaneously and will also burn skin. Be warned !!
The magnifier is brand new.
- Size: 280mm x 280mm (11" x 11")
- Thickness: 2mm
- Focal length: 220mm
- Magnification: 3x
- Material: PMMA
- Groove pitch: 0.5mm (50 grooves per inch)
WARNING:
Never place your hand directly in the beam or instant, serious burns
will result. Exposed surfaces and objects can heat to over 2000 degrees
fahrenheit. Skin contact with these surfaces will send you straight to
the A&E. Never experiment without protective gear including fire
retardant gloves and solar eye protection. Never EVER leave a lens in
the sun unattended or you could start a fire. Never let kids play with
the lens and do not cook or heat objects while pets or small children
are active in your work area.
The optical concentration spot
illuminating lighter surfaces like concrete or shiny metal objects will
exceed the lux (light output) of staring at direct sunlight. Without
proper eye protection, vision loss is possible. Exposed objects like
cook wear and cement blocks have retained extreme temperatures for over
an hour without additional exposure. The power of the sun can be
deceiving and anyone using a Fresnel Lens for solar collection should
get in the habit of treating the Fresnel Lens like a stove, furnace, or
blowtorch.
When finished with a project, store the lens covered,
preferably in a dark room or closet, AWAY from windows that experience
direct sunlight. This is important to remember as annual sun positioning
changes with the seasons. Used correctly, a Fresnel Lens is a wonderful
scientific tool and a perfect solution to off grid cooking.