EF 300 f/2.8 L IS II with 1.4x OR EF 400 f/4 L DO ???

[Vern]

Hi Andre,
I have the 300 2.8L II and absolutely love this lens with both the 1.4 and 2X III tele's. I find it light weight enough to carry along backpacking (b/c wildlife photography is a keen interest). It is the best IQ lens Canon has out at the moment and the performance w both tele's is very good. The close focus distance w the 2X makes for a powerful combo for avian photography when you can get close. IMO if you can afford the price you will be delighted with this lens - even with the added weight over the 400 DO. From the ISO charts the 300 with either converter has better IQ that the 400 DO. If you buy the 1.4X tele, you'll then have a very nice flexible range when you include your 70-200 f/2.8L as well.

I do recommend renting from Lens Rentals from this site if you really want a first hand test. I did this when deciding b/t the 500 f/4L II and the 600. It was money well spent (though not cheap) and I decided on the 600 after lugging it around successfully. (It is why the 300 feels light to me now!) Good luck.

[Harfang]

Thanks Vern,

it is my feeling also. I have rented the EF 300 before and used it with my 2X and I was very happy with the results.
I'm looking right now to rent the EF 400 DO but there is not a lot of places in Canada that rent this lens (I have found Lens Rentals Canada)