Sony SEL075 UWC

[Vivek]

Recently, i bought one from Guy (Thanks Guy! ) . This is custom modified to fit the Sony RX1R II (which is still at the repair shop).

While it works well with wider lenses like the Sony FE 28/2 it was made for and Sone E 16/20 (same bayonet connection), there is something interesting mismatch on the longer FE 55/1.8.

On this lens, the UWC, besides making it wider also projects fuzzy, dreamy images with a glow from f/1.8 to f/2.5. This effect is kept at all focus distances all the way to infinity. It is gone by f/4 though.

Because of the fuzz, AF does not work well and manual focus is mandatory.

I will post some samples when I get some more time.

 

[Vivek]

Untitled by Vivek Iyer, on Flickr

RX1R II (#3) with the SEL075 UWC, f/7.1

This UW converter is fine for close ups. At infinity, the CA, smearing etc, is a bit too much.

 

[Audii-Dudii]

Actually, I find it to be a better performer / more useful than just for closeups ... at least for the type of photography I do with it and when mounted on an RX1, anyway.

Perhaps the RX1RII's higher-res sensor is more revealing of its flaws?

Focus distance for this photo was ~15 feet and at f8, there's enough resolution to see individual tines at the very top of the saguaro. I don't think I've ever used it at infinity, though, nor with the lens more open than f5.6, so who knows?