James, I weigh up two things reach against low light needs.................I've not used a mark ii 300 but did have the mark i................I won and shoot almost exclusively with a 400doii, upgraded mainly because of fears of getting parts for the 300is f2.8
To me both supply stella IQ, the 300 gives you f2.8 the 400 more reach ,which gets magnified with the EXT iii options... the body for me personally will be the decider as to just how well the 2X ext's will perform AF wise...I went from a 1Div to 1DXii the DXii made the ext 2x sing, sure an IQ hit but that for me was where the combo worked as designed by the canon boffins
Bare lens image made at night , continuous lighting not much really not flash....................... fink it's iso 16000, nah not 1600 16,000
I guess it's a way of sharing the lens and camera being pushed a bit
_S2I3704 PK HO smj by
Stuart Philpott, on Flickr
1.4 extiii... hare taking the P*ss out of a lame tog struggling to free his lens from a hawthorn cropped from landscape to portrait cause of tog's said lameness,
_S2I9395 Opps smj Tdn by
Stuart Philpott, on Flickr
2x ext iii ha funny made in exactly the same spot as the fox piccy,my front door step
_S2I8881 by
Stuart Philpott, on Flickr
The thread might be quiet but my do is ii is still being used I'm just a bit more quiet on the togging front right now than normal................... i'm making a togging bus.......... I might now be the only user here, I suspect most have gone without a mirror..that said it's one hell of a tool OMG one hell of a tool.......A tool I don't think i'll ever be worthy of. It's so well balanced one can almost throw it at a screaming spar and still get sommit
_70F4463 by
Stuart Philpott, on Flickr
all old images already shown here probably , so with you already owning 200f2 for me you have ansered your own Q and how I differentiate between the 300 and 400 becomes less relevent..
I'm getting along with my 400 just fine James,
really I have honed in on mammals as my primary subjects ,spend most of what little time I have on roe and brown hare, , that doesn't do the tool justice as the AF can be astounding, and they are sort of a tad more static but the spar was full tilt so gives some indication of Af for BIF
Maybe a tiny cross section of a ball park of what the tool is capable of
worth seeing Arash Hazighi's work with this tool from a few years back !!
stu