Скачать с ютуб I built a large format 3D camera! — 4x5 stereo photography with 19th century lenses - [Republished] в хорошем качестве

I built a large format 3D camera! — 4x5 stereo photography with 19th century lenses - [Republished]

This video was originally published on my old channel and was moved during the channel migration to keep this content available. ----------------- From the original video description: This is the third video in the series on building a large format 4x5 stereographic view camera. This video contains a lot of information so you can use the table of contents below to jump to topics in the video of interest. In the video, I'll discuss the camera build, how everything came out, the unique specifications of the camera and how they influence it's use, and different types of media that can be used (film, paper negatives, direct positives, glass plates, daguerreotype plates, etc). I'll also discuss in detail the lens spacing specifications that allow a scaled up stereo camera like this to work. Finally, I'll take you along as I make test stereo pairs with the camera using Harman Direct Positive Paper and we'll look at the pairs in the darkroom using an oversized mirror stereoscope. I also provide wiggle gifs for each of the images which provide a way for viewers at home to get a sense of the 3D effect produced by the camera. For those who would like to try "free-viewing" (a technique where-in you essentially cross your eyes to see the 3D effect), the stereo pairs are provided on the accompanying blog post: https://www.francescofragomeni.com/bl... Table of Contents: 00:00 - Introduction 01:22 - Preliminary discussion of stereo sizes and how some can be viewed 03:04 - Background on the build 03:58 - First look at the back of the camera (modifications to Graflex backs) 04:59 - Using the ground glass attachment 06:03 - Discussing more about the camera construction (the woodworking) 06:41 - Metal finishing (front standard and hardware) 07:08 - How the drive shaft focus mechanism works 07:39 - Bellows 07:50 - Where to find links to the other videos for this build 08:18 - Construction and function 08:27 - Minimum and maximum focus 08:53 - The lens boards 09:21 - The lenses (19th century Goerz stereo lens pair) 10:09 - Aperture conversion for the lenses (the lenses predate the standard f-stop scale) 10:54 - Behind the lens filters for use with direct positive paper 12:10 - Lens spacing for stereo photography and how it works with this camera 18:16 - The lens spacing control wheel 19:12 - Barrel lenses vs lenses in shutters and how exposures are made 20:28 - Getting into the test shots - Test 1/portrait 1 21:38 - Test shot 2/ portrait 2 22:12 - Test shot 3/ landscape 1 - Shooting a valley 23:22 - Developing the direct positive paper 23:43 - Using Farmer's Reducer to lighten the images 24:20 - Discussing mirror stereoscopes and viewing larger (4x5) stereo pairs 26:10 - Explaining wiggle gifs and their limitations in showing the 3D effect on computer screens 28:58 - Looking at the results! 31:23 - Some thoughts and excitement around the results and the validation of a successful build 31:53 - Whats next for the camera and closing remarks Video by Francesco Fragomeni ---------- Instagram: www.instagram.com/francescofragomeni