Canon EOS 70D Ultra Wide Lens

[kcdemby]

Headed to Banff National Park in 2014.  It has been suggested I purchase an ultra wide lens - a 16 or 17mm on full frame cameras, but a minimum focal length of 24mm.  Any suggestions for the best lens that meets this criteria?

[ebiggs1]

I'm still learning so I have many doubts...
What benifit would I get from buying a
22mm lens..?
Or 35 mm..?
I realise a 10-22mm would be ideal but the price for this type of lens is high, so much that I am considering a refurbished or secondhand one when I can. Does anyone advise against..?

RichMack,

1- 22mm = no advantage

2- 35mm = is considered 'normal' on a cropper.

3- 10-22mm used or referbished, great idea but try a used one first.  

4- stay away from Rokinon you will hate it as many others have come to. 

[TCampbell]

If you need the lens just for one trip... you might consider renting.

If you need it once... rent it.

If you need it often... buy it.

[digiquisitive]

Please see my post re: diffraction with the excellent 10-22mm lens. Digiquisitive.