hi all . am thinking of going on a safari next year lets discuss 3 lenses for bird/ nature photos.
1. 300 mm f2.8
2. 3oo mm f4
3. 400 mm f5.6
i cannot understand why anyone would buy the f2.8. it is twice the weight and 3 times the price of the other 2 [ btw can anyone tell me what are the best prices of the 3 lenses [new]mentioned ?is shallow DOF the only advantage of the 2.8? also, with the longer focal length, would not the 400 mm f5.6 have a similar DOF to the 300mm at f4?
for shooting in ambient light now with sensors being so good [ talking digital here] i can shoot at ISO 800 or even 1600 so dont really need large apertures for shooting opportunities.
i have a 5D now with a 70 to 200 f2.8. my options
a. maybe shouyld just get a 1.4TC or
b.maybe buy a 20D body to go with my 70 to 200mm zoom [ which equals 300mm with the 1.6 crop factor] . would the photos be good enough for national geographic?
c. buy one of the lenses mentioned above
1. 300 mm f2.8
2. 3oo mm f4
3. 400 mm f5.6
i cannot understand why anyone would buy the f2.8. it is twice the weight and 3 times the price of the other 2 [ btw can anyone tell me what are the best prices of the 3 lenses [new]mentioned ?is shallow DOF the only advantage of the 2.8? also, with the longer focal length, would not the 400 mm f5.6 have a similar DOF to the 300mm at f4?
for shooting in ambient light now with sensors being so good [ talking digital here] i can shoot at ISO 800 or even 1600 so dont really need large apertures for shooting opportunities.
i have a 5D now with a 70 to 200 f2.8. my options
a. maybe shouyld just get a 1.4TC or
b.maybe buy a 20D body to go with my 70 to 200mm zoom [ which equals 300mm with the 1.6 crop factor] . would the photos be good enough for national geographic?
c. buy one of the lenses mentioned above