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05-17-2013, 11:22 PM   #1
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How to measure the filter thread size?

Hi all, Im getting a 40 or a 40.5 to 46 step up ring.

But what´s the right place to measure?
1. On the top edge of the filter (40.5mm)?
2. The inside of the filter/top of thread edge (40mm)?

Hmm???

05-17-2013, 11:48 PM   #2
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..or: Does anyone know the filter thread size for a 1953-4 Carl Zeiss Jena Tessar 2.8/50 T?
05-17-2013, 11:52 PM   #3
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Found an answer for that here:CZJ Tessar 2.8/50 T

Answer:40.5mm

..and the correct place to measure must then be on the top edge of the filter
05-18-2013, 07:33 AM   #4
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Filter thread is measured in the same way as any other thread; it's the outside diameter of the thread itself. The best way to measure it is with a caliper.

05-18-2013, 09:42 AM   #5
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QuoteOriginally posted by Kobayashi.K Quote
Filter thread is measured in the same way as any other thread; it's the outside diameter of the thread itself. The best way to measure it is with a caliper.
Thank´s..and those points of the diameter are on the top of the filter ring
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