By using that adpater you gain 1 stop aperture with 0,7x focal length reduction. Kipon writes:
If you want to use the 50mm lens: 50mm × 2x (Micro Four Thirds focus magnification) × 0.7x (BAVEYES focus magnification) = 70mm angle of view equivalent
If you want to use the 35mm lens: 35mm × 2x (Micro Four Thirds focus magnification) × 0.7x (BAVEYES focus magnification) = 49mm angle of view equivalent
And as you know there are a huge amount of OM lenses we can use with the Baveye adapter. This is just the list of the prime lenses…Click on the link to check the price and auctions on eBay: 21mm f/2.0 and 21mm f/3.5 lens, 24mm f/2.0 and 24mm f/2.8 and 24mm f/3.5 shift lens, 28mm f/2.0 and 28mm f/2.8 and 28mm f/3.5 lens, 35mm f/2.0 and 35mm f/2.8 and 35mm f/2.8 shift lens, 40mm f/2.0 lens, 50mm f/1.2 and 50mm f/1.4 and 50mm f/1.8 and 50mm f/2.0 macro and 50mm f/3.5 lens, 55mm f/3.5 macro lens, 85mm f/2.0 lens, 90mm f/2.0 macro lens, 100mm f/2.0 and 100mm f/2.8 lens, 135mm f/2.8 and 135mm f/3.5 lens, 180mm f/2.0 and 180mm f/2.8 lens, 200mm f/4.0 and 200mm f/5.0 lens, 250mm f/2.0 lens, 300mm f/4.5 lens, 350mm f/2.8 lens,, 400mm f/6.4 lens, 500mm f/8.0 lens, 600mm f/6.6 lens, 1000mm f/11 lens.