iPro Tele 2x iPhone Lens

Schneider Optics is releasing a true 2x Lens for iPhone with a scheduled release in April. It will have full photo and movie mode without vignetting. It will have a 70mm equivalent to 35mm format on iPhone4s and 56mm on iPhone 4, which should make it great for portrait shots. It will be manufactured with top grade optical glass with multilayer coatings to prevent lens flare and increase light transmission in an anodized aluminum housing.

iPro Lens System

Schneider optics has come out with their recently developed iPro Lens System, a really pro looking lens mount for the iPhone. Its not just a clip on lens but has bayonet mount for two lenses in the kit, one is 165 degree fisheye lens and the other is a wide angle lens with a 35 degree wider field of view. It has an msrp of 199.00 and compatible with iPhone 4/4s.

Needing A Bit More Resolution For the iPhone 4

There are couple routes to go with this, the first is to take a look at the Owle Bubo iPhone Camera Kit. It adapts to the front of your iPhone 4 or 4s version and gives one a combo 37mm wide angle and macro capability as well as external microphone in machined aluminum case assembly.
Its possible to go a step further and add the EnCinema 35 adapter kit or buy it together with an Owle Bubo Kit to adapt 35mm lenses to the iPhone 4/4s to give maximum flexibility for depth of field or telephoto capabilities with ones iPhone 4.