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I'm looking for a small sized, portable lens with 23mm or 35mm (if it's a 35mm lens, it needs to be compatible with a Metabone or Zhongyi adapter to get 'real' [full frame wise] 35mm). The Fujinon seems too bulky to me, despite the excellent quality!

The Voigtländer lenses are very interesting, but there is no compatibility (Leica M) with the current Metabone/Zhongyi lineup. Although, the Voigtländer focal lengths are a bit odd for my wish list

I'm looking for a 23mm lens (except the Fujinon) with at least f/1.4 for the Fuji X-System. I would love to experience the 'real' 35mm on my Fuji. Any ideas?

I'm not sure if you're gonna be satisfied using these lenses. It seems to me you'll probably not gonna use them very often. You're going to be much more satisfied with the quality of the xf lenses. If you want a 35mm experience in small format, then your best option will be the xf27mm pancake. It's small and closest to 35mm (40mm) you can get in a small form factor. No aperture ring though. I passed on the slrmagic because of its size and realized I didn't need another 35mm equivalent lens, because I already got a x100. Maybe just be patient. Fujifilm is introducing a "smaller" 35mm the end of this year. Maybe they'll do the same with the 23mm...

I'm looking for a small sized, portable lens with 23mm or 35mm (if it's a 35mm lens, it needs to be compatible with a Metabone or Zhongyi adapter to get 'real' [full frame wise] 35mm). The Fujinon seems too bulky to me, despite the excellent quality!

The Voigtländer lenses are very interesting, but there is no compatibility (Leica M) with the current Metabone/Zhongyi lineup. Although, the Voigtländer focal lengths are a bit odd for my wish list

Hi everyone,
 
My name is Martin, and I'm new to the forum. I wanted to share some videos and feedback I got from using a Speedbooster Ultra OM to FX in case any of you was wondering to get one.
 
 
1.- Unboxing

 
2.- Warning, some incompatible lenses 

  3.- Review with Zuiko 50mm f/1.4   Hope you find this videos helpful, let me know if there is anything you want to know about the speedbooster.   Cheers! Martin

MiMA is totally right. I think you will have problems to find such a lens.
 
I think one of the fastest speed boosterable vintage 35mm lens is the Minolta 35/1.8 http://artaphot.ch/minolta-sr/objektive/149-minolta-35mm-f18. Also you can check some 35/1.8 M42 lenses here: http://m42lens.com/. You can speed boost M42 with a Minolta speed booster plus a Minolta to M42 adapter.
 
But maybe the none vintage SLR Magic 23/1.7 is an option for you: http://www.thephoblographer.com/2013/05/01/review-slr-magic-23mm-f1-7-fujifilm-x-mount/#.VXLl-EYvtgA
Or the similar Mitakon 24/1.7.
 
( If size and especially price doesn't matter you also could adapt Canon's or Nikon's 24/1.4. Or Canon's, Nikon's, Samyang's or Sigma's 35/1.4 with a speed booster. But these lenses aren't vintage neither. Also you can speed boost this lens http://www.zeiss.de/camera-lenses/de_de/camera_lenses/slr-lenses/distagont1435.html. )