The 400/5.6 will give sharper images but you'll need decent light to benefit from it. The 300/4 + 1.4x works well on duller days when the IS can be a benefit.....I used to say that 300/4 combination gets the most use but the 400/5.6 is the lens with the sun tan.
Shots in this thread were taken with the 300/4 + 1.4x (on a 30D)
Interesting question as I am looking for a long lens, presently use my 70-200/2.8 with a 2X get good results but wonder if the 400/5.6 prime would be better
Thanks all. Those shots from bob are what I wanted to see! I have a 70-200 f4 on the way along with a 1.4 TC and am performing some long term planning with regards to my next lens. Looks like a 300 f4! Does the IS work with a TC on it still?
I was looking in to the same thing as I am sick of taking half a ton of kit on long flights, After reading the reviews the 400 is sharper than the 300 with and without the converter on the 300,most of the time on holiday I have the 1.4 on my 300f2.8L anyway so when a used 400f5.6 popped up in the classifieds at a nice price I had to have it and it is superb.
Does anyone have comparison shots (100% crops) with 300mm f/4 + 1.4x, 400mm and 100-400mm? I am not looking to buy right now, but maybe I will go on safari at some point in a year or two.
I had this combo and was entirely happy. No idea about the 400/5.6 but my copy of the 300/4 was pin sharp (better than my 30/2.8) and the t/c didn't do much harm to it. Great and light pair and the ability to also just have the 300/4 makes it a winner for me.
On the lookout for good priced 400 5.6 myself. Been weighing up between that and the 100-400 recently but i finally decided on the prime. I never even considered the 300, just because i do not really want to be using coverters that could degrade the image.
At one point i had 70-200, 300mmf4 and 400mmf5.6, along with the 1.4tc, i sold the 300mmf4 as it wasnt getting any use the 300mm isnt as sharp with the tc fitted as the 400.
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