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08-12-2015, 12:48 AM   #1
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The ultimate coating for lens barrels to remove glare/flare/reflection?

A while back, my attention was brought to a scientific breakthrough in carbon nanotubes that resulted in what scientists now consider to be absolute black. The breakthrough product of this is called ventablack. If price were not a factor, and pentax used such a material to coat the interiors of lens barrels and lens hoods, what do you think the level of benefit would be?

08-12-2015, 01:55 AM   #2
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QuoteOriginally posted by Auzzie-Phoenix Quote
A while back, my attention was brought to a scientific breakthrough in carbon nanotubes that resulted in what scientists now consider to be absolute black. The breakthrough product of this is called ventablack. If price were not a factor, and pentax used such a material to coat the interiors of lens barrels and lens hoods, what do you think the level of benefit would be?
Next to zero. First of all, you have to make the carbon nanotubes stick to the barrel. Even if you manage to do that without degrading its light absorbing properties, the optical path is well defined and usually shouldn't touch the lens barrel at too many points (at least when using a proper lens shade). Even at points where the light could potentially hit the barrel, current lenses do a great job minimizing barrel reflections - not only by using light absorbing paint (that also contains carbon particles), but also by shaping the barrel in a way that minimizes diffuse reflections towards the center (you probably already saw those "ridges" near the back element of some zoom lenses).
Ventablack would make most sense for the sides of the lenses to minimize intra-lens reflection. However, it's hard to say if there is a process to apply it to glass surfaces and have it stay there.
In the end, it still wouldn't affect inter-lens reflection which is the main reason for flare / loss of contrast.
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