I have had similar problems when using old shutters from 120 bellows cameras with homemade lenses on a 4x5 camera. The aperture readings of the shutters bears no resemblance to the amount of light...
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I have had similar problems when using old shutters from 120 bellows cameras with homemade lenses on a 4x5 camera. The aperture readings of the shutters bears no resemblance to the amount of light...
Excellent article especially the "light spreading screen" definition.
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There are obviously many factors in fresnel lens placement that I have failed to understand. Could someone explain to me that if a fresnel lens has to have a focal length related to the focal length...
I hope this helps to clear up some confusion
The total cost of this project was about $5 and two hours work. As an added bonus it annoyed the...
I absolutely understand that the frosted side of the ground glass screen must be exactly at the film plane. If you place the fresnel lens flat onto this frosted side of the ground glass screen...
There has been a lot of chat and controversy about the use of fresnel lenses in combination with the ground glass on large format cameras in attempt to brighten the image formed on the screen thus...
I have had similar problems calculating f stop values on homemade lenses mated to old canibalised shutters from vintage bellows cameras. I made a through the lens meter which has solved these...
I use car windscreen wiper springs
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Have a look at the through the lens meter on this site, all your bellows factors will be resolved at a stroke
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I use windscreen wiper springs
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What you need is a through the lens meter to provide you with the data required. There is one on this site.
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I use car windscreen wiper springs
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I use the springs from car windscreen wipers
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Ihave built a 4x5 camera with MAKERBEAMhttps://uploads.tapatalk-cdn.com/20170711/b8ef948ddfde9eb2c85554e522bb131c.jpg
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I have built a 4x5 camera with MAKERBEAMhttps://uploads.tapatalk-cdn.com/20170711/8012d5ff78d553f75a32c54a33c587de.jpg
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When i first started messing about with the idea of building a through the lens meter the reasons for it were to more fully understand the effects of bellows extension on exposure, the effects of...
On the subject of spot or average meter readings with the through the lens meter.
I have explored the idea of placing lots of small solar cells in patterns then activating some of them and...
To calibrate the through the lens meter
I suggest that at first you use the lux meter
(before you chop off the end) and print out a LUX to EV conversion table from the net. Use the lux meter...
It is able tto cover all exposure values (EVs) from 1 to 16
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Through the lens metering .
To make this meter you will need.
1) A LUX METER. Plenty of these on e bay. You will need one where the sensor head is seperate from the meter joined to it by curled...
I am seriously unimpressed with tapatalk
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Tapatalk appears to only accept one photo at a time
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Makerbeam camera
https://uploads.tapatalk-cdn.com/20170705/104a151bdeeb1c3748789e315ee0441c.jpg
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I am having diffulculty downlooading pictures
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I have made a 4x5 camera using aluminium extrusions called makerbeam. I have bought one 150mm 4x5 lens and have made a couple more using binocular objective lenses and old prontor shutters from...