I recently purchased two absolutely beautiful commercial Ektar lenses dated sometime in 1947 [ES] and both of these lenses have a very distinct "blue" coating appearance. I also have a 12" Commercial Ektar in a barrel - again sometime in 1947- but a later production due to the higher number after the ES. This Ektar has a very different coloured coating, it is a brown/yellow/purpleish colour when viewed straight into the lens.
All lenses are luminised with the L in the circle. Images are identical no matter which lenses is used so I was wondering if anyone has any thoughts. I'm referring to black and white images. Contrast and sharpness are the same for all lenses.
One of the lenses is marked ES 180 whereas the other the serial # is ES 630
Just a curiosity someone may have a thought on.
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