May 22
Lens All Sizes
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Arctiva Comp Goggles Pink White Anti-Fog Lens Snowmobile One Size Fits All |  |
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US $44.95 | 19d 23h 54m |
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All Sizes HJC CS-R2 Snowmobile Heated Electric Dual Lens Shield Helmet Yellow | |
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US $189.95 | 23d 13h 14m |
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Arctiva Comp Goggles Red White Anti-Fog Lens Snowmobile One Size Fits All | |
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US $44.95 | 19d 23h 54m |
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Arctiva Comp Goggles Blue White Anti-Fog Lens Snowmobile One Size Fits All | |
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US $44.95 | 19d 23h 54m |
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Arctiva Comp Goggles Black White Anti-Fog Lens Snowmobile One Size Fits All | |
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US $44.95 | 19d 23h 54m |
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Lens All Sizes
Make a pinhole diameter the same size as the aperture on a camera lens?
I'm trying to do a project comparing the resolution a digital pinhole to that of a digital camera lens.
Is it possible to make the pinhole sizes match the aperture sizes on the lens? Would the pinhole camera be less likely to work because it does not have the "optimum pinhole diameter"?
Any and all help will be greatly appreciated.
can they be proportional?
At some point you are going to produce holes that "let in the daylight".
If your pinhole is the exact same size as a lens aperture then what's the difference as far as diffraction goes?
Yes, there is a optimum pinhole size for a given focal length and film format. I will try to find the chart if I can.
Addendum:
Here it is...
http://www.mrpinhole.com/calcpinh.php
Another....
http://www.kyotophoto.org/pinhole/resource/tool/PinholeDiameter_e.html
Barn Camera - Lens Size
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Arctiva Comp Goggles Pink White Anti-Fog Lens Snowmobile One Size Fits All | |
|
US $44.95 | 19d 23h 53m |
|
All Sizes HJC CS-R2 Snowmobile Heated Electric Dual Lens Shield Helmet Yellow | |
|
US $189.95 | 23d 13h 14m |
|
Arctiva Comp Goggles Red White Anti-Fog Lens Snowmobile One Size Fits All | |
|
US $44.95 | 19d 23h 54m |
|
Arctiva Comp Goggles Blue White Anti-Fog Lens Snowmobile One Size Fits All | |
|
US $44.95 | 19d 23h 54m |
|
Arctiva Comp Goggles Black White Anti-Fog Lens Snowmobile One Size Fits All | |
|
US $44.95 | 19d 23h 54m |
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Tifosi Wisp Dual Lens Sunglasses
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DescriptionLike their name implies, the Tifosi® Wisp sunglasses are light as a feather; they're specially designed to fit smaller faces. With all the performance features of their larger cousins, they include a durable, lightweight Grilamid TR-90 frame, adjustable ear pieces, and 3 sets of interchangeable lenses. |
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Petzl E97 Tikka Plus 2 Headlamp
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DescriptionThe TIKKA PLUS 2 headlamp integrates two light sources for versatility: one white, high-output LED and one red LED. The white LED delivers 50 lumens in maximum mode and lights up to 35 meters. In economic mode, it can reach a burn-time of 140 hours... |
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Tool Logic CC1SB Credit Card Companion with 1/2-Inch Knife, Translucent Black
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DescriptionThe Tool Logic Credit Card Companion is a multifunction tool card with ten features. It feautes a 2-inch Inch serrated blade and precision folding scissors. It also has an 8-time magnifying power lens and compass... |
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(9 Items Combo) Tool Repair Kit Precision Screw Driver Set Torx + Flat Head + Safe Plying Prying Pry Tool for Motorola
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DescriptionItem 1 - 7 : Magnetized tips precision torx screw driver. Sizes : T3, T4, T5, T6, T7, T8, T10. Durable with precision cut sizes to ensure you can get the job right like a professional. Support end (blue color ends) give you the ability to turn the screw driver and holding it still, and magnetized tips to hold the screws to avoid dropping the tiny parts... |
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Run DMC Rapper Retro Large Clear Lens Eye Glasses Black
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DescriptionNEW 80s RETRO RUN DMC RAPPER HIP HOP FAKE CLEAR LENS OVERSIZED EYEGLASSES EYE GLASSES EYE WEAR Great quality fake fashion glasses. Flash back to the 80s. They are back in style! A wonderful fashion accessory to compliment any outfit... |
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Pin Hole Glasses Black Full Frame Kit 1 Kit
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DescriptionMany people have experienced amazing improvements in their vision by wearing the Natural Eyes Vision Glasses and following the exercises in the manual provided with the kit. Wearing these glasses exercises the muscles in the eyes, thereby changing the shape of the eyes to improve vision... |
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Lights Out Sleep Mask
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DescriptionDesigned to allow Rapid Eye Movement (REM), the ultra-soft Lights Out Sleep Mask promotes deep, rejuvenating slumber. Scientists have long known that REM sleep is the most crucial part of the sleep cycle... |
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ViewSonic PJD5123 SVGA DLP Projector 120Hz/3D Ready, 2700 Lumens, 3000:1 DCR
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DescriptionViewSonic's PJD5123 is a high-performance SVGA 800x600 DLP projector with 2,700 ANSI lumens and 3000:1 contrast. This projector supports PC and HD video signals and projects clear, bright images in most lighting conditions... |
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Logitech 720p Webcam Pro 9000
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DescriptionLogitech QuickCam Pro 9000 WebCam 2.0 Megapixel 960 X 720 w/ Microphone USB 960-000048. Product may differ from image shown. |
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Microsoft LifeCam Studio 1080p HD Webcam - Gray
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DescriptionMicrosoft LifeCam Q2F-00001 Webcam - Silver Q2F-00001 Web Cameras |
How long would it take to count all the atoms in a grain of sand?
Approximately. Plus or minus a billion years.
Size of sand grain? The smallest you can see without a lens.
Speed of counting? One per second.
Assuming an average grain of sand is about 1 cubic millimetre in volume and it is composed of silicon dioxide (SiO2, molar mass = 60 g / mol) with a density of about 2.4 g / cm^3:
A 1mm^3 grain would have a mass of (2.4 g / cm^3) / ( 1000 cubes / cm^3) = 2.4 x 10^-3 grams
That mass per grain divided by 60 g / mol = 4 x 10^-5 moles
Then (4 x 10^-5 moles)(6.02 X 10 ^23 formula units per mole ) = 2.4 x 10^19 units of SiO2 per sand grain.
Since there are 3 atoms in one SiO2 unit, there would be (3 atoms per unit)(2.4 x 10^19 units) =
7.2 x 10^19 atoms present in one grain of sand.
Considering there are 31556926 seconds in a year, we are talking about 22,800,000,000,000 years.
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