Why no ultra wide primes (8mm) for micro 4/3?

[texshooter]

I'm window shopping all the lenses on the B&H website for the Olympus E-M1, and I noticed something peculiar. There are no ultrawide (7mm or 8mm) prime lenses available? There are plenty of fisheyes, but no ultra wides.

Why is this?

[langier]

I am very happy shooting my Panasonic 7-14mm f/4 (14-28mm equivalent in ff). Olympus just brought out their f/2.8 version a few weeks ago. Olympus also has a 9-18mm though it is slower. I think there's also a couple of primes from Voiglander, Kowa and Samyang that are primes in the "ultra wide" range. Olympus also makes a 12mm prime and I think I've seen maybe a 10mm.

The primes are out there if you search, but I can tell you my 7-14mm is one fine lens!

[texshooter]

There is no prime wider than the Voigtlander 10.5mm.  When I said ultra wide I meant 7mm or 8mm non-fisheye.

[Mjollnir]

I'm window shopping all the lenses on the B&H website for the Olympus E-M1, and I noticed something peculiar. There are no ultrawide (7mm or 8mm) prime lenses available? There are plenty of fisheyes, but no ultra wides.

Why is this?

Don't know, but I'd love to have one, and I have the 7-14 F4.

[pluton]

You could easily adapt one of these, but they are $30,000.  Covers APS-C also.
http://www.westcoastcinevideo.com/West_Coast_Cine_Video/Prime_Lenses_files/DSC02073wtmk.jpg

[Tremon]

There is one.

http://www.kowa-prominar.com/special/wide_lens/index.htm

8.5mm f/2.8

Otherwise I also miss small uwa primes. I have a small hope that Olympus might present something now that their pro zoom lineup is almost complete.

[SZRitter]

There is no prime wider than the Voigtlander 10.5mm.  When I said ultra wide I meant 7mm or 8mm non-fisheye.

I just found a 10mm Rokinon on B&H. So, between the Kowa and this, there are two.

http://www.bhphotovideo.com/c/product/1039937-REG/rokinon_10m_mft_10mm_f_2_8_ed_as.html