Extension tube help!
Oct 3, 2018 19:00:48 #
imagemeister wrote:
Maybe in your link you should talk about the differences in internal reflections between bellows and tubes and the dangers of these reflections ? 
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The only lens I have ever reversed was a 100mm Zeiss macro Planar - on a precision 8X10 bellows camera for 10:1 magnification. We then mounted a pellicle mirror in front of the lens' rear element so we could get coaxial illumination to the subject (large scale integrated circuits). The guy I worked with had a degree from RIT.
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Oct 10, 2018 22:16:20 #
Following up on all the great suggestions.
A few days ago, my wife happened to show me an old black velvet bag she was throwing away. I quickly grabbed it and used it to line all the internal surfaces of the extension tubes and reversing rings. I cut the velvet to size, then used double-sided tape to stick it to the inside of the tubes.
Voila! no more glare...at least non I have been able to create so far. I have shot up to 2.3:1 with a reversed 50mm and full tubes. The images seem quite sharp, although DOF, focus, and exposure are a challenge at the higher magnifications.
I will post any decent ones I get before winter sets in.
Thanks again everyone!
A few days ago, my wife happened to show me an old black velvet bag she was throwing away. I quickly grabbed it and used it to line all the internal surfaces of the extension tubes and reversing rings. I cut the velvet to size, then used double-sided tape to stick it to the inside of the tubes.
Voila! no more glare...at least non I have been able to create so far. I have shot up to 2.3:1 with a reversed 50mm and full tubes. The images seem quite sharp, although DOF, focus, and exposure are a challenge at the higher magnifications.
I will post any decent ones I get before winter sets in.
Thanks again everyone!
Jan 26, 2019 22:33:29 #
I used a piece of black construction paper in a roll inside to stop this. Also try a good quality black plastic electrician tape at joints. DO NOT LEAVE TAPE IN PLACE OVER ONE DAY.
And, if you like the results, buy a better set.
Bill
And, if you like the results, buy a better set.
Bill
Jan 26, 2019 22:41:07 #
enygy wrote:
Not scientific but I put a bit of light absorbant ... (show quote)
AHH, NO PAINT, POSSIBLE VAPORS, A GAMBLE. You would have to wait till NO smell, and then??? My opinion. Overcautious?, maybe.
Bill
Jan 26, 2019 23:05:26 #
This is an old thread. Anyway, problem seems solved. Good job, everybody! 👍🏽
Jan 26, 2019 23:54:18 #
Mark Sturtevant wrote:
This is an old thread. Anyway, problem seems solved. Good job, everybody! 👍🏽
History repeated itself. I had the problem, you and Brenda pointed the way to a solution.
Bill
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