Meyer-Optik Trioplan N 100mm f/2.8 Exa/Exakta Lens Review
Great old lens with nice looking design. Built from aluminium and fine quality glasses so not heavy at all it has comparable weight than modern all over plastic lenses.
Lens

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Fact Sheet
Vendor name
Meyer-Optik Görlitz
Meyer-Optik Görlitz
Type name
Trioplan
Trioplan
Product year
N/A
N/A
Focal min (mm)
100
100
Focal max (mm)
100
100
Focus min(cm)
120
120
Aperture max
2.8
2.8
Aperture min
22
22
BaRREL LENGTH (mm)
N/A
N/A
Elements
N/A
N/A
Diaphragm action
fully automatic
fully automatic
Weight (g)
N/A
N/A
Filter size (mm)
55
55
PUsh on diameter(mm)
N/A
N/A
Angular field
N/A
N/A

I have this lens which is obviously related, but to the one shown here but it is not like others that I currently see for sale. I thin this is an earlier model S/N 5553972. It is a “Zebra” with the aperture ring at the front of the lens on “the zebra”.
In any case it is a delightful little lens and I love it to bits already.
Tom
It is so pity that there is no information about Meyer-Optik Gorlitz Trioplan 50 mm f/ 2.9
It is a really great thing and I think it should be in line of “must have”
Some pictures here:
http://fotoyarsk.okis.ru/meyer-optik.html
Indeed, if you make a review I will publish it and link to your source, I have this lens long time ago I found excellent.