Hi,
Ok the following models, the traits of these :
- Canon 40d
- Nikon D90
- Nikon D300
- Sony A700
- Pentax K20d
- Olympus E3
Which would be best for Aviation with a view to doingt weddings in a few years?
Ok, imo from an aviation pov & bearing in mind what lenses you use will also have an effect as will your budget. These were my thoughts when I did this ~18 months ago:
Pentax K20D - not enough fps & AF performance isn't great.
Olympus E3 - tremendous build/sealing, expensive imo for it's performance given that I didn't need it's imo main selling feature - build/sealing. Also relatively poor selction of longer lenses at reasonably affordable prices.
Nikon D300 - great body but it was ~2x the cost of a 40D/A700 & imo only ~5% better. Also not the best selection of reasonably affordable lenses for the purpose - the 80-400 doesn't have a great rep for AF performance, the 200-400 is superb but way out of my budget & heavy.
So for me it came down to Canon 40D & Sony A700. From a body pov I much preferred the handling of the Sony, IQ, fps & AF performance are pretty much similar.
Canon had the 400/5.6 plus the 100-400 IS L which at the time was probably the best reasonably affordable all round aviation lens imo - but I knew that Sony had the 70-400 G SSM coming ...
I bought the A700 & have never regretted it despite many Canon 40D etc. using friends. Firmware V4 was the icing on the cake (basically brought the A700s IQ upto D300 standard - it, D300 & D90 all share substantially the same sensor if not identical).
Subsequently bought the 70-400 G SSM which imo
is better than the 100-400 IS L (at least until Canon revamp that).
If I was doing it today I would probably be looking at the Canon 50D, Oly 630 & the Nikon D90 as well but I suspect that of those imo the most interesting would be the 50D. It has better AF than the 40D plus AF adjust, a higher res screen & no doubt a few other minor extras. Also the A700 is imminently due for replacement so that would get considered too.
In terms of IQ I think that we have reached a bit of a plateau where any of them are good enough & there is minimal differences between them.
So really it's features that you need, lens availability, handling & budget & only you can really decide that balance for you.