No...
I found out that both of my 200mm lenses (Canon 200mm and Tamron 200mm) show disastrous lateral chromatic aberration at corners, while a much simpler russian-made 133mm Tair -11A does not (but it shows more coma).
One of the differences between the designs was the position of iris:
Tair has iris immediately after the front element (it is almost 45mm in diameter when opened - large and most likely expensive, 24 blades) and both Canon and Tamron have much smaller iris (8 blades, 20mm dia or so), deep inside...
So I decided to keep the internal iris at max opening, and added the diaphragm or aperture (F5.6) in front of the lense(s) and try again.
The reduction of chromatic aberration was dramatic (it is almost non-existent with this arrangement).
See here:
http://www.iceinspace.com.au/forum/s...ad.php?t=51866
and here:
http://www.iceinspace.com.au/forum/s...ad.php?t=57870
This arrangement also removed pretty ugly spikes caused by 8-blades iris.. (the round opening of the external diaphragm must be as fine as possible of course.. unless you want special effects.. which I don't :-) ).
This morning I was reading Bert's post (Avandonk) and he mentioned that he is using the same trick to reduce CA (or, at least this is how I understood his remark.
In his images the spikes are non-existent, so perhaps this was his main reason for external aperture, his lens being 300mm L-series and known to be good wtr CA)
http://www.iceinspace.com.au/forum/s...ad.php?t=58500