Wife has us signed up for a hike up a mountain in Big Bend to see the rare Colima Warbler. I am no pro, just a hobby, but shooting at a distance is a real possibility. I am tempted by the rf600 but wonder if the 1.4x teleconverter with the 100-400 may work as well on my R7. Both would give about the same focal length and similar aperture but not carrying the extra lens up that 5 mile mountain would help. Has anyone used the 1.4x on an Rf100-400? Which would give the best quality?
dpmonk, may I suggest you put your quiery to either Johnsey or Caladina as they are knowledgeable in this area. to do this click on members, then click on their name. A window with "write something will come up". Write your quiery there if they have not gotten back to you with a reply from "New Posts".
the rf 100-500mm imo extenders should be seen as a bonus item for a bit of extra reach not really a main way to get the reach you need the best on fast constant aperture primes and zooms, not so good on variable focal zooms good on bright objects like the moon, or on bright sunny days, not so good on dull days personally i don't really see the benefit from a 1.4, i'd rather go with the x2 and as mentioned its a bonus item really the 2x works well on my ƒ2.8 zoom but the lens is very sharp to begin with check out his other vids
I am a little afraid that on the crop sensor R7 a 2x on a 100-400 would actually be like 1280mm and thinking that may be too much without a tripod and also f22. I am leaning toward the rf600 which is f11 and would equal 960 focal length on full frame, right? Just curious if anyone has used either the 1.4 or 2x on the rf 100-400 with decent results.
I know that it is not answering your question. But I have used an EF 400mm f5.6 L and an EF 1.4x extender on my RP, and it worked fine. Yes, the AF was slower, but it was accurate, and the images came out sharp. Gary
I would give the edge to the 100-400L its much faster at 5.6 than the f11 and you will normally want the speed in long lens, a converter will drop it down to f8 (1.4) or f11 (2x) but only when you use them. Also the lens is a zoom and should be optically superior, although with a convert it is probably pretty close. The 600mm is a nice price and i guess its pretty sharp for that price range and a non-l lens. But it is very slow at f11 ( you will be fighting to get light from the shutter and ISO) and also you don't get to zoom, so your cropping with your feet which is painful with such magnification, on the plus side it should be significantly more portable than the other setup, but I would consider it a 1 trick pony so you may find you only use it in very specific situations.
