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First ever batch of coated (T) ever made lenses?
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PostPosted: Tue Jun 12, 2018 11:59 am    Post subject: First ever batch of coated (T) ever made lenses? Reply with quote

Hi guys,

Been just wandering what's the world's first batch of coated items (surely made by Zeiss, around 1937) to know? Klauses, please? Smile

Just acquired 5,8cm Biotar with s/n batch around 2.244.xxx being T-coated, so, just curious

Marek


PostPosted: Tue Jun 12, 2018 6:52 pm    Post subject: Reply with quote

I've never heard of any first batch, I don't even know if it would have been documented or even labeled on the lens, it would be an interesting thing to find out.


PostPosted: Tue Jun 12, 2018 7:09 pm    Post subject: Reply with quote

Quote:
As mentioned above, natural index-matching "coatings" were discovered by Lord Rayleigh in 1886. Harold Dennis Taylor of Cooke company developed a chemical method for producing such coatings in 1904.[20][21]

Interference-based coatings were invented and developed in 1935 by Alexander Smakula, who was working for the Carl Zeiss optics company.[22][23][24] Anti-reflection coatings were a German military secret until the early stages of World War II.[25] Katharine Burr Blodgett and Irving Langmuir developed organic anti-reflection coatings known as Langmuir–Blodgett films in the late 1930s.


https://en.m.wikipedia.org/wiki/Anti-reflective_coating


PostPosted: Tue Jun 12, 2018 9:01 pm    Post subject: Reply with quote

Kodak were the first to commercialise lens coating, they developed a vacuum deposition method. However, I am not sure when they first produced coated optics, certainly they were turning out coated optics in vast quantities by 1942 for military use. Whether Zeiss were a couple of years ahead or not I don't know, these things were secret military technology in the late 30s and 40s.


PostPosted: Tue Jun 12, 2018 10:20 pm    Post subject: Reply with quote

My earliest fully Coated Zeiss lens is a 5cm F1.5 Sonnar and is in the 190xxxx block, 1936 according to Thiele. It is not marked "T". It is hard coated, vacuum deposition. I have an earlier 175x block Sonnar, 1935, with a coated front element. I have seen another in the 175 block just like it. I've read that the Vacuum Deposition equipment was available at about that time. Zeiss coated some lenses, not others, of the same block. I have an uncoated Sonnar in the same 190xxxx block as the coated lens.


PostPosted: Wed Jun 13, 2018 4:40 am    Post subject: Reply with quote

My 1.5 prewar Sonnar is uncoated, I think, from memory it's a 1938 production, I'd have to check the serial again to be sure - it's the lens in my avatar.

I wonder if some uncoated lenses were later given coatings as you could certainly get a lens coated in the 50s, maybe it was a service offered by some dealers - send your lens off to be coated?


PostPosted: Wed Jun 13, 2018 10:05 am    Post subject: Reply with quote

visualopsins wrote:
Quote:
As mentioned above, natural index-matching "coatings" were discovered by Lord Rayleigh in 1886. Harold Dennis Taylor of Cooke company developed a chemical method for producing such coatings in 1904.[20][21]

Interference-based coatings were invented and developed in 1935 by Alexander Smakula, who was working for the Carl Zeiss optics company.[22][23][24] Anti-reflection coatings were a German military secret until the early stages of World War II.[25] Katharine Burr Blodgett and Irving Langmuir developed organic anti-reflection coatings known as Langmuir–Blodgett films in the late 1930s.


https://en.m.wikipedia.org/wiki/Anti-reflective_coating


There's more information on this page: https://en.wikipedia.org/wiki/History_of_photographic_lens_design#Anti-reflection_coating


PostPosted: Wed Jun 13, 2018 1:58 pm    Post subject: Reply with quote

Teemō wrote:
visualopsins wrote:
Quote:
As mentioned above, natural index-matching "coatings" were discovered by Lord Rayleigh in 1886. Harold Dennis Taylor of Cooke company developed a chemical method for producing such coatings in 1904.[20][21]

Interference-based coatings were invented and developed in 1935 by Alexander Smakula, who was working for the Carl Zeiss optics company.[22][23][24] Anti-reflection coatings were a German military secret until the early stages of World War II.[25] Katharine Burr Blodgett and Irving Langmuir developed organic anti-reflection coatings known as Langmuir–Blodgett films in the late 1930s.


https://en.m.wikipedia.org/wiki/Anti-reflective_coating


There's more information on this page: https://en.wikipedia.org/wiki/History_of_photographic_lens_design#Anti-reflection_coating


Like 1 Thank you!


PostPosted: Wed Jun 13, 2018 6:02 pm    Post subject: Reply with quote

Teemō wrote:
visualopsins wrote:
Quote:
As mentioned above, natural index-matching "coatings" were discovered by Lord Rayleigh in 1886. Harold Dennis Taylor of Cooke company developed a chemical method for producing such coatings in 1904.[20][21]

Interference-based coatings were invented and developed in 1935 by Alexander Smakula, who was working for the Carl Zeiss optics company.[22][23][24] Anti-reflection coatings were a German military secret until the early stages of World War II.[25] Katharine Burr Blodgett and Irving Langmuir developed organic anti-reflection coatings known as Langmuir–Blodgett films in the late 1930s.


https://en.m.wikipedia.org/wiki/Anti-reflective_coating


There's more information on this page: https://en.wikipedia.org/wiki/History_of_photographic_lens_design#Anti-reflection_coating


Thank you both, saved me to list them Wink Like 1 Like 1 Like 1


PostPosted: Thu Jun 14, 2018 12:33 pm    Post subject: Reply with quote

iangreenhalgh1 wrote:

I wonder if some uncoated lenses were later given coatings as you could certainly get a lens coated in the 50s, maybe it was a service offered by some dealers - send your lens off to be coated?


Here in Switzerland it was quite easy to get coatings even in the mid-1980s, for a uncoated lens


PostPosted: Thu Jun 14, 2018 11:40 pm    Post subject: Reply with quote

Looks like I've started a fruitful discussion at least.


PostPosted: Fri Jun 15, 2018 12:42 am    Post subject: Reply with quote

Marek wrote:
Looks like I've started a fruitful discussion at least.


Congrats Whoo Turtle Thank you!