Harry

If you have a lot of money..
a. super wide : Sigma 12-24 f4.5-5.6 (FF compatible since you are going to get "a900")
b. CarlZeiss 24-70 f2.8 (FF compatible)
c. 70-300G SSM f4-5.6 (fast focus but slow aperture - more of outdoor use) or Sony/Sigma 70-200G SSM/HSM f2.8(also very very fast focusing but bigger aperture)
d. in case you want a macro - Tamron 90 f2.8 / Sigma 105/70 f2.8 / Sony 100/50 f2.8
e. for low-light (really low-light) get a 50mm f1.4 or 35 f1.4 (on aps-c 35mm more useful, on FF still very useful)

If you have a limited budget and want brand new..
a. Sigma 10-20 f4-5.6
b. Sigma 24-70 f2.8 or Sony/Minolta 24-105 f3.5-4.5
c. 70-300G SSM f4-5.6 or Tamron 70-200 f2.8 (no HSM or SSM - screw drive but cheaper)
d. in case you want a macro - Tamron 90 f2.8 / Sigma 105/70 f2.8 / Sony 100/50 f2.8
e. low light get 50mm f1.4

If you are on a strict budget and don't mind second hand..
a. Sigma 10-20 f4-5.6
b. Sony/Minolta 24-205
c. Second hand Beercan 70-210 f4 (ebay or something)
d. Macro get Sigma 50 f2.8
e. Second hand minolta 50 f1.7

Grade "A" lenses from Sony don't come cheap. Here are a few
- Carl Zeiss 24-70 f2.8 ( sharpest zoom i have ever used, wide open aperture is useful too. only setback is the somtimes harsh bokeh. nothing to worry about)
- Sony 70-200 f2.8 G SSM (fast focus and great sharpness from wide open. very good bokeh)
- Sony 35 f1.4 G (very very good lens - Sharp from f2, at f1.4 a little softer only)
- Sony 50 f1.4 (not so high grade but good enough to out resolve the 14MP sensor)
- Carl Zeiss 85 f1.4 (sharp from 1.4)
- Carl Zeiss 135 f1.8 (sharper than CZ 85 f1.4 )
- Sony 300 f2.8 G SSM ( VERY VERY VERY VERY VERY SHARP and FAST FAST focus even with the Sony teleconverters - 1.4x and 2x)
- Sony 70-300 f4-5.6 G SSM ( fast focus but slow aperture. sharp too)
- Sony 135 F2.8{T4.5} STF (manual focus lens - sharp when accurately focused and best bokeh lens around - built for bokeh)

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