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    Right of course, chemical focus refers to images...

    Right of course, chemical focus refers to images made with meniscus lenses but a SLR lens would be a corrected compound lens. So it wasn't an aha moment after all, darn. But perhaps the red focus...
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    chemical focus

    Just had an "aha" moment while explaining the red focus dot on a lens to a student. The red focus dot on this lens refers to the focus adjustment that needs to take place when focusing infrared film....
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    This figure is for the whole school. I would like...

    This figure is for the whole school. I would like to spend some before the sciences spend it all but its hard to find any journals on photography anymore.
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    Photo magazines and journals

    Our school has $100,000 for new journal purchases both on-line and in print. Does anyone have any suggestions. Its hard to find out what is still available.
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    Beam Splitter

    I wonder if this could be used to make a self separating RGB camera
    http://www.surplusshed.com/pages/item/l14562.html
  6. With a google search for zone plate photography I...

    With a google search for zone plate photography I found this Instructable article on how to print a zone plate from the whizkid app....
  7. A photon sieve is like a zone plate but with...

    A photon sieve is like a zone plate but with holes rather than fresnel bands. Zone plates and photon sieves need to be sized for the a specific focal length in order for them to focus, or give a...
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    Ok then, they'll go in the recycling bin.

    Ok then, they'll go in the recycling bin.
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    Free – you pay for shipping

    I need more room in my workshop and have hundreds of empty beer and soda cans that I had prepped for my poptop pinhole cameras. Sales of these have been dead so I won’t be making any new one.

    I...
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    I got home late after running an errend but since...

    I got home late after running an errend but since it was still light out I went to my roof deck and left the camera out for an hour even though the sun was setting. I probably only got 5 minutes of...
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    Snow Day Camera Results

    This is the cyanotype negative and inverted positive shot in my 90mm, f-1, 4x5 camera. I coated Somerset paper with Ware's cyanotype and exposed at sunset on my roof. Still need to adjust the focus a...
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    Snow day project

    I got inspired by JE Piper's article on AlternativePhotography.com and made a lens addition to an old pinhole camera. 90mm focal length and 90mm in diameter means its an f-1. Plan to do in-camera...
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    Rob, These were done on B&W paper. F-180,...

    Rob,

    These were done on B&W paper. F-180, 75mm focal length tube cameras http://www.pinholeblender.com/tubecamera.htm exposures varied by the day and weather and the attention span of 10 year...
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    Elementary School Pinholes

    Teaching pinhole in two elementary schools this week. Here is a selection of images the 5th grades have done using my tube cameras.

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    Page 6 of this pdf shows how to make one,...

    Page 6 of this pdf shows how to make one, http://www.anchoroptics.com/documents/download.cfm?id=14 The center bottom picture and paragraph below it tells how to use it. The other instructions are how...
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    Wow, great information Tom. I found a good chart...

    Wow, great information Tom. I found a good chart on diopter focal lengths in the chipped lens kit pdf. This will help me make my reading glasses camera. Also much needed math formulas for the...
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    Collimator

    I made a collimator today following directions from a pamphlet by Edmunds Scientific called Fun With Optics. I can use it to check the focal lengths of all of the odd lenses I have. I'm using it with...
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    Wow, great camera and video. This will be great...

    Wow, great camera and video. This will be great for my summer class. I'm going to have them make 4x5 and 8x10 cameras and lenses. Alan Greene's book Primitive Photography has directions on how to...
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    Solargraphy Question

    I showed a colleague lumen prints and she fell in love with the process. Then I showed her solargraphy but instead of shooting the sun she's been trying to make images of objects in her backyard. She...
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    The fifth graders show

    The show is now up. I'm really proud of what the kids did.
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    Results from the 5th graders

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    Here are some of the work that the 5th graders did at my recent workshop at Jamestown Elementary School
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    Jamestown Elementary

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    Here is a shot that the teacher made with one of my Pop Top Pinhole soda can cameras earlier in the year. All of her students thought it was a spy camera because it looked just like a regular...
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    Setting up for a pinhole shot

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    Here I am with Ms Gaynor as we show her 5th grade class how to set up a pinhole shot with still life objects in the foreground.

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    These are some of the processed negatives. Next week...
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    I used half a sheet of 5x7 inch paper and the...

    I used half a sheet of 5x7 inch paper and the camera was a soda can. I use a dermal tool to cut the top off above the bend on one can and below the bend on another, this gives me two pieces that...
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    Jamestown Elementary School

    From the roof of Jamestown Elementary School in Arlington VA. This was shot during their 16 day Christmas break. I'm teaching pinhole there to the fifth graders this week. Their teacher used one of...
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