400mm 2.8 MKI + TCx2III test

Hi all,
Just wanted to share the second-life experiece on an (old) super tele, the 400mm F/2.8 MKI.
Last month I found this beauty and just couldn't resist taking it home with me. The lenscode said it was made in 1991. Exterior pretty beaten but optically in mint condition (no fungus).
I knew it was the first EF-AF lens to come out and misses the fluorite elements from today so wide open some softness was to be expected (in fact not that bad al all).
I was planning on using it mostly with a 5dIII for birding but went out to test it on a 600d (crop sensor) with a TC to reach a whopping 1200mm.
Despite bad weather (overcast, 4° with rain showers and a tiny bit of sun) I went to Terneuzen with a monopod and set the 600d at ISO400.
You can judge for yourself but for me the results came out pretty well.
The buildings on the other side is Vlissingen, some 11 miles away (18km).
Only next time I hope on better (weather)conditions.

It looks quite good considering a 2X is attached. It does look underexposed though. What f-stop did you use?

F-stop was set on 8
I checked the histogram and you may be wright about the underexposing bit.
When cranking up the levels it doesn't do well for the background dough so I'll leave as it is.
Tx for the input!
The TC does an incredible job in terms of sharpness, contrast and fringing.
Later on (time and weather permit) I'll do an optical versus digital crop comparison.
I'm inviting similar combo's to join in with pictures. Let's collect some

Lenty007 wrote in post #16485822
I'm inviting similar combo's to join in with pictures. Let's collect some

No 2x but I can try with a 500 is and 1.4ii.

Lenty007 wrote in post #16485822
I'm inviting similar combo's to join in with pictures. Let's collect some

My friend uses 400/2.8 non IS ver. I like you with 5D III and C2x III and he gets very good results. I am also thinking about changing 7D to 5D III.
Here are mine taken with 7D+400/2.8 L non IS II+C1.4X III. I have not noticed AF slows down with 1.4 TC.

Against light 1/800s f/9 ISO640

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These pics are fantastic!!! Thanks for sharing!
Indeed, AF with TC suffers a bit but still going fast. I'm quite sure it'll be fast enough for flying things