alphydan's instructables
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Earned a bronze medal
Contest Winner
Runner Up in the
Outdoor Cooking Challenge 2016
Contest Winner
Second Prize in the
Outside Contest 2016
- alphydan favorited Candle making machine (Arduino) by FlorisVO1 year ago
- alphydan completed the lesson Welcome to Bread in the class Bread Class1 year ago
- alphydan enrolled in Bread Class and Arduino Class1 year ago
- alphydan's entry Cooking at 350ºF with the sun (Fresnel cooker from scrap) is a winner in the Outside Contest 2016 contest 1 year ago
Winner! - alphydan commented on alphydan's instructable Cooking at 350ºF with the sun (Fresnel cooker from scrap)1 year ago
- alphydan's entry Cooking at 350ºF with the sun (Fresnel cooker from scrap) is a finalist in the Outside Contest 2016 contest 1 year agoFinalist
- alphydan followed The Oakland Toy Lab2 years ago
- alphydan commented on alphydan's instructable Cooking at 350ºF with the sun (Fresnel cooker from scrap)2 years agoView Instructable »
Nice! How do you adjust the height of the focal point?
- alphydan's entry Cooking at 350ºF with the sun (Fresnel cooker from scrap) is a winner in the Outdoor Cooking Challenge 2016 contest 2 years agoWinner!
- alphydan's entry Cooking at 350ºF with the sun (Fresnel cooker from scrap) is a finalist in the Outdoor Cooking Challenge 2016 contest 2 years agoFinalist
- alphydan commented on alphydan's instructable Cooking at 350ºF with the sun (Fresnel cooker from scrap)2 years agoView Instructable »
@karlbamforth, you are absolutely right. Safety with the lens is very important. We made sure hands were off the area of focus when it was working (some of the pictures are with clouds, or pointing in a different direction). But when adjusting the pan we wore some thick welding gloves.
- alphydan entered Cooking at 350ºF with the sun (Fresnel cooker from scrap) in the Trash to Treasure Challenge contest 2 years ago
- alphydan entered Cooking at 350ºF with the sun (Fresnel cooker from scrap) in the Outside Contest 2016 contest 2 years ago
- alphydan entered Cooking at 350ºF with the sun (Fresnel cooker from scrap) in the Outdoor Cooking Challenge 2016 contest 2 years ago
- alphydan posted an instructable Cooking at 350ºF with the sun (Fresnel cooker from scrap)2 years ago
- alphydan favorited Geodesic Dome Media Pod by greg05942 years ago
- alphydan favorited LED Plank Light by makerblog3 years ago
- alphydan favorited stacked lamp by mikeasaurus3 years ago
- alphydan favorited Modern Penny Farthing by bac193 years ago
UV rays will bend slightly more because of dispersion (colours with a higher frequency will refract with a bigger angle). This could mean that UV rays are less focused at the visible focal point (but the difference is likely small).