01-08-2015, 12:59 AM
(This post was last modified: 01-08-2015, 01:01 AM by Brightcolours.)
You can say it is not true at all, but it is.
The PF lens, like the DO lens configurations used in Canon DO lenses, make the lens all on their own shorter, without causing CA because it is combined by a single refractive lens and without the need of many more elements.
Unless Nikon is unclear about their own PF lens:
![[Image: Nikon-Phase-Fresnel-PF-lens-explained-550x319.png]](http://nikonrumors.com/wp-content/uploads/2015/01/Nikon-Phase-Fresnel-PF-lens-explained-550x319.png)
And Canon does similar things, but with multiple DO elements bonded togethet without gap in the 400mm DO II to prevent the flaring the Nikon lens shows.
http://www.canon.co.uk/For_Home/Product_...enses.aspx
http://cpn.canon-europe.com/content/prod..._ii_usm.do
Like I pointed out before, the simple fact is that the 300mm f4E PF has the same number of elements as the 400mm f2.8E FL.... And the latter has no PF element.
The PF lens, like the DO lens configurations used in Canon DO lenses, make the lens all on their own shorter, without causing CA because it is combined by a single refractive lens and without the need of many more elements.
Unless Nikon is unclear about their own PF lens:
And Canon does similar things, but with multiple DO elements bonded togethet without gap in the 400mm DO II to prevent the flaring the Nikon lens shows.
http://www.canon.co.uk/For_Home/Product_...enses.aspx
http://cpn.canon-europe.com/content/prod..._ii_usm.do
Like I pointed out before, the simple fact is that the 300mm f4E PF has the same number of elements as the 400mm f2.8E FL.... And the latter has no PF element.