70-200 FE G Lens or adapter and Tamron 70-200 f2.8

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tokof

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I've just upgraded my camera to an A7, from an Nex-6, and with that I need to buy a full frame E mount adapter...

I current;y have a Sigma 105mm f2.8 and Tamron 70-200 F2.8 on A mount. The Sigma is lovely, but doesn't get used very often as the zoom is a lot more practical. Equally, the tamron is very soft wide open and I find auto focus a bit clumsy with the adapter (Sony SLT adapter).

My question is, am I better off saving the money I need to spend on the full frame adapter, selling the two lenses and buying the Sony FE 70-200 F4?

Would it be considerably worse than the 105 prime? Will the F4 max aperture be a noticeable problem?

All opinions welcome!

Thanks
 
Many folk differing opinions on this. I had the Sony A77 mii with the Tamron 70-200mm I really liked the lens but when I bought the A7 mii I sold it and have ordered the Sony FE 70-200mm f4 for me I just never wanted to carry adapters
 
I have some A mount lenses and adaptor but find that the native FE lenses work best in terms of focus speed and functionality. For example only E mount works with Bracket Pro app on focus bracketing.

I can't comment on the tamron lens you mention but find the FE 70-200 is nearly as sharp as my Sigma 105 macro though it does not offer very close focus so it can't replace it for a lot of my work.
 
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The Tamron lens you have is very sharp at f4 though, sharper I'd wager than the Sony at f4. If you can live with adaptors you have a great lens there.
 
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