Cheapest 400+mm lens

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Sanderguy777 New Member • Posts: 21
Cheapest 400+mm lens

I'll keep to get a long telephoto lens (super telephoto?) lens for bird photography.

I'm a student and the campus has a lot of ducks and geese that hang out, as well as a great egret that is very tame.

I have a Sony a7iii so I can adapt just about anything I want to.

My questions are:

1. Is there any way to get a sub-$100 lens that would look half decent?

2. Is used or vintage EVER a good option, or is it better to just get what I need new? (Not a pro, and don't plan on becoming one, so no real "need" for camera gear)

3. Is OSS or IS a good thing to invest in, or is it a mute point at 400mm and above?

4. Is there a need for me to get the huge f/2.8 or f/5.6 lenses?

5. Are teleconverters EVER a good idea if they are sold separately from a lens and not permanently attached?

Thanks

Sony a7
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