A mediocre 500mm zoom or a good 300 ?

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Name
Simon
Edit My Images
Yes
Hi,
I have a Sigma 170-500 lens at the moment. It's an ok lens but hard to get sharp above 400mm and really needs good light due to the shutter speeds needed to to stop shake. I am considering selling this and actually buying a new lens, a Tamron SP AF70-300mm VC USD (not many 2nd hand around) which from what I have seen is really good, with IS etc. I've just been through some of the favourite pictures I have taken and I rarely go above 450 with the sigma. I'm just thinking I rarely use it above 450mm for things I photograph, so why not get a better 70-300 and crop should I have to.
Also it's a damn sight lighter.
I can probably get 200+ for the 170-500 and the Tamron is 289 with a 5 year warranty.
What do you think ?
 
Can't comment on a mediocre 500mm lens but I have the Nikon 70-300mm VR lens and I tried that with a Kenco 2x teleconverter so that I guess would make it a mediocre 600mm lens.
In post processing I cropped the images from the 300mm lens to give same image size as the 600mm. Even though the resolution was lower the cropped images looked better and sharper IMHO than the un-cropped from the 600mm.
I now just use the 70-300mm and crop whenever I need to.
Obviously a good quality 500mm or 600mm lens would give better results but I cant justify the cost of buying one.
 
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