Goto Optical responds to Takahashi with a wave of offerings for 1976
Posted 01 July 2023 - 05:07 AM
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- Jon Isaacs, deepwoods1, james7ca and 3 others like this
Posted 02 July 2023 - 12:13 AM
The introduction of Goto's apochromatic objective lenses into the market was a major transformation.
It was too expensive for me at the time, so I didn't buy it.
Prior to Goto's development of the apochromat (triplet type), Canon had a utility model patent for objective lenses for the manufacture of astronomical telescopes.
And Takahashi commercialized a triplet type semi-apochromat to overcome the achromat. Takahashi was able to shorten the focal length by adopting triplets.
After the development of Apochromat by Goto, Asahi Optical (Pentax) sells triplet type products.
Each has its own characteristics, and I find each one attractive.
Advances in computers and the development of new software have made lens design possible.
- mazdak, PawPaw, 17thCentury and 1 other like this
Posted 02 July 2023 - 06:54 AM
Some new information has come to light regarding when Goto started working on their Apochromat designs. There is an ad by Goto in the 1976.9 Tenmon catalog states they started working and testing a new type of glass from Schott starting in 1973 but eventually chose Ohara glass. I cannot add the document here so I will post it on this thread:
- mikemarotta likes this
Posted 20 August 2023 - 10:44 PM
This makes me wonder why ED apochromatics did not become industry standard 40 years ago, 30 at the latest, and why we even bother with achromatics at all.
Thanks for your hard work and great research and reporting.
Posted 25 August 2023 - 11:17 AM
They made nice stuff! The blue EQ mount is particularly nice. Too bad Goto wasn't more widely distributed in the USA