as a birder, i encounter probably the same problem as all,
my reach is too short many times,
as taking photographies is the main purpouse
i currently have a canon 7d mark1,
and as longest lens a canon 400mm f5.6,
with kenko converters 1.4 and 2.0,
i alm quite happy with the 1.4, af still possible in very bright light, iq ok-ish,
less about the 2.0 one, no af of course, but iq is low end,
combining the two...no comment so
obviously i should upgrade to a ef 600 f4.0 or 400mm f2.8
but i fear my wife would not say ... ¥€$...
so digiscoping ?
as my 400mm has a aperture of 77mm,
any smaller scope makes not really sence, or am i wrong,
3 options seem to be possible at this time, (accessories included)
1 a reasonable priced ed scope (which would cost me around 1500€ or even less)
2 a mirror one alike the celestron c5 (cost about a 1000€)
3 a canon 600mm fd f4.5 (cost about a 1200€)
i know this is not really a birder forum,
but i did not find really usefull information else,
any thoughts ,
...or should i change my wife....