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Barry,
As a wide field junkie I think a bit over 2º is enough to take in. At a dark site the 150mm f8 achro's are fantastic at wide field , even though its only 2ishº.
So I use a 70mm f7 achro which gives 2.5º and thats pretty good enough for just about everything....Had a 102 f5 and the FC was pretty bad so I think get a 120mm f5, have a bit less TFOV but with less aberrations.
The view isn't good if it is full of seagulls half way out!
My 2 cents
Matt
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