Tried out Leigh's 400mm lens with my 2x extender by Paul | Jan 30, 2012 | 5 comments taken from a very long way away.. it came out pretty sharp :) https://paulpichugin.com #blog Google+: Reshared 3 times Google+: View post on Google+ Post Views: 1,240 5 Comments Paul Pichugin on 31 January, 2012 at 3:49 am The thing to remember about the extender is that it drops your aperture by 2 stops.. so an f2.8 lens becomes a f5.6 and a f5.6 becomes an f11.. Josh Males on 30 January, 2012 at 9:51 pm I've been thinking about getting an extender, but am curious about the quality. This looks pretty good. Evi Thomakou on 30 January, 2012 at 4:02 pm looks like moving glass Quentin CAUDRON on 30 January, 2012 at 3:10 pm I was debating getting an extender, but maybe I should get something higher than 250mm first ? :P Eric Losee on 30 January, 2012 at 3:04 pm Wow, 800mm. Looks great.