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Latest Review Posted Tamron-F 28mm F2.8
How many versions of the Tamron 28mm f2.8 were there? says 4, maybe 1 or 2 versions becoming the early adaptamatics and there were definitely different formulas and designs

I have the Tamron-F and I have seen the very identical lens without the "F" designation . There are 52mm variations, 58mm variations, and a 62mm version....that 62mm version escapes me

The 28mm f2.8 Tamron-F has a high gloss paint and comes with a square hood, it's really a very beautiful looking lens and it is very well constructed.
Looks precise and feels precise in hand. No doubt Tamron was going for that Leica look and why not? Imitation is the most sincere form of flattery.

The Tamron - F version; (non-adapatamatic, adaptall, and adaptall-2 versions)

It weighs 230 g (8 oz) has 7 elements in 7 groups and was marketed in the late 70's. It's about 2 inches in length and focuses to 10". These have the 52mm threads for filters, I do not recommend using them with a digital camera and have mixed results mostly affecting focus. If anything I relate these F system lenses as the early SP, Tamron made these with a very specific goal in mind and this illustrates it .....

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