On the left is a f/4.5 180mm Tessar in shutter. On the right is a f/4.5 250mm Tessar in barrel.
Both are identified as "Carl Zeiss Jena"
On the left is a f/4.5 210mm Heliar in shutter. On the right is a f/4.5 300mm Heliar in barrel:
Both are identified as "Voigtlander Braunschweig Heliar"
I could understand if the 250mm Tessar were ~39 % longer than the 180mm Tessar, but it's more than twice the length. Similarly, I could understand if the 300mm Heliar were ~43 % longer than the 210mm... but it's roughly 3 times the length.
Why do we see such a disproportionate difference in size between the shutter barrel mounted versions of the "same" lenses ? Is there a difference in lens design ?
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