Originally posted by MJSfoto1956 typical of most modern zooms these days -- they are XXX only at infinity. The two pictures above prove the point: at 6 meters the 60-250mm is obviously less "long" but at 18 meters the 60-250mm clearly has much more "reach" than the 70-210mm.
Michael
Yeah but then 6meters and you don't get even 210mm (more like 150mm) and you are bound to f/4 instead of f/2.8... It is no issue sure for big mamals because if they are near your would not need a such long focal length anyway and if they are far away you'll get 250mm but for small birds and things alike, you'll get the TC just to counter this effect, that's rather anoying.
To me it would be matter of price (some tamron 70-200 can be got used for 1/3 the price of the DA60-250), focus performance (even the 55-300 focus faster than the 60-250 as per Pentax forum review) and max apperture (f/2.8 give more margin in difficult conditions and is interresting for portraiture at the begining of the range) and subject distance (60-250 win at 18 meters and match its focal length at infinite) and size (the 60-250 is significantly smaller/lighter than a 70-200).
Choose what is most important to you !