Where have all the Focal-reducers gone? (with apologies)

Started 10 months ago | Discussions thread
EinsteinsGhost
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Samples Without SB
In reply to martindesu, 10 months ago

I have only a few at hand (with either a55 or NEX-3):

And here is similar composition with two different lenses:

STF

Tamron 90/2.8

martindesu wrote:

EinsteinsGhost wrote:

EinsteinsGhost wrote:

To me, personally, the SB advantage is in getting that wider FOV along with some of that shallower DOF. As long as there is ample sharpness under those conditions in the thirds, it will meet its purpose. The added benefit is faster shutter speed (may not be much pronounced wide open).

Can't speak for LT but SB seems to be pretty good outside the center, or so the prelim tests with a few lenses show. It has already turned my cheap old Minolta 35-70/4 (a very good lens wide open) into what appears to be a pretty good 25-50/2.8 kit zoom for NEX. The combination with the adapter weighs only about 800g and is quite small. I can always carry 20/2.8 pancake for landscape use.

But its real companion will be Sony 135/2.8 STF and it appears to be a fine combination. I have long wished that Sony made an 85 or 100mm version of the STF, and with SB, I get 95mm/2. I hope to put it to use soon, weather permitting.

I am not arguing with nobody, but I am curios in what way 135F2.8, converted to 90mmF2 with the SB or LT could be better than Minolta Rokkor 85F1.7 or Canon FD85F1.8 + simple adapter to NEX.

What I know about the 85F1.7, or Canon FD85F1.8:
- they are very sharp between F2.8 and F8, corner to corner on APS-C
- they are OK form F2, and have very smooth bokeh, making them ideal for portraits.
- they outresolve NEX-7's sensor between F2.8 and F8, corner to corner , so the resolution, definition, etc. is maximal, it can not be better... than all the clear 24.000.000 px. of NEX-7.

Obviously, the comparison is valid for other pairs of lenses with SB / LT vs simple adaptor, ex: 55F1.2 vs 85F1.8 on SB/LT, or 135F2.8 vs 200F4 on SB/LT

Neither 85 (or any, for that matter) can match the STF's blur characteristics. I would wager that they can't match the sharpness, contrast and micro contrast wide open either which is how I use the lens.

As to how SB affects these, I will be testing at the first opportunity soon. From prelim looks of it, the combination looks pretty good, corner to corner.

Please can you post some results with the STF?

I'd like one for a future A7r, but their use is... something of a special case.

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Sony Cyber-shot DSC-F828 Sony SLT-A55 Sony Alpha NEX-6 Sigma 18-250mm F3.5-6.3 DC OS HSM Sony 135mm F2.8 (T4.5) STF +12 more
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