This week we talk about making your own lenses, why Back Focal Length is meaningless to Ethan, and how to play around with loose achromat lens elements to make your own, homemade lens.
The formula: Formula:
F = (f1 x f2) / (f1 + f2 - d)
BFL = (f2 x (d - f1)) / (d - (f1 + f2))
f1 is the front lens,
f2 is the back lens,
d is the distance between the lenses.
F is the focal length,
BFL is the distance between the back lens and the recording media (film, sensor)
A link to a spreadsheet with the formula in it: https://docs.google.com/spreadsheets/d/1yQ3dsD0Rs-HflRcnPYHSmK0soLXtykGAPl8pdZcrBpM/edit?usp=sharing
Special thanks to Erik Mathy (https://www.instagram.com/erikhmathy/ @erikmathy).
We first heard about this formula on an episode of the Large Format Photography Podcast (https://largeformatphotographypodcast.podbean.com/)
We also talk about a modified Adolescent Crown Graphic Nick's working on.
Ethan mostly tells Graham his formula is wrong.
Graham mostly tells Ethan he names his products after rodents and wonders when the Cameradactyl Chipmonk is coming out.
Graham offers to give away a bunch of darkroom equipment to someone in Northeastern Florida (Jacksonville to Ocala, Daytona to Gainesville). Email Graham@homemadecamera.com if you are interested.
Warning, Graham swears at the very end. If this had been edited by Simon of the LFPP and Classic Lenses, there would have been a gap where you guessed what Graham said but because Graham edited the show, you hear a bunch of F-words in a row.
Finally, we may be taking the month of November off from recording. Don't worry, we'll be back by the Winter Solstice when things are darkest.
E76 Old Timey Podcast
E75 David Hancock and His Pinhole cCameras
E74 Joe Van Cleave
E73 Reimagining the Holga
E72 Ethan's Self-Developing Mystery Show
E71 Douwe Krooshof and his Cyanotype Enlarger
E70 Jason Lane and Chromatic Abberation
E69 Jeremiah Jones and his Homemade Cameras
E68 Erik Mathy makes Homemade Lenses
E67 Nicole Small and the Cyanotype Process
E66 What we are working on.
E65 Stereo Photography
E64: Matt Bechberger and his Wondrous Spot Meter
E63 2020 Year in Review
E62 Livestreamed to the world.
E60 Hervé Ellena
E59 Components of Interest
E58 The Mongoose
E57 Graham Burnett of Graflexparts
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