300mm limitations.....

Discussion in 'Photography Equipment & Products' started by puyjapin, Mar 20, 2009.

  1. puyjapin

    puyjapin TPF Noob!

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    Ive just got the 70-300vr, which i am very pleased with. Its a nice lens. Im quite new to all this and I was hoping 300mm would give me some reasonable wildlife shots but even at 300mm I cant get close enough really. Only by zooming after thus losing sharpness. Whats the minimum realistically for wildlife/birds??
    Also if i used a teleconverter would the VR still function ok?
     
  2. AlexColeman

    AlexColeman TPF Noob!

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    Birds are usually supposed to be taken with 500mm, and I don't know. I would check by googling it.
     
  3. epp_b

    epp_b No longer a newbie, moving up!

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    Most people agree that 500mm is pretty much a minimum for birds and wildlife.

    Take a look Photo.net's Bird Photography FAQs.

    As for teleconverters, you can't use them with slow zooms like the 70-300 VR. For example, the 2x converter costs you two stops of light. This would make the lens an effective 140-600mm f/8 - 11, which is pretty useless, plus you'd have a lack of sharpness from using the teleconverter and using it wide open.
     
  4. AlexColeman

    AlexColeman TPF Noob!

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    You need a Fixed 2.8 for TC use.
     
  5. epp_b

    epp_b No longer a newbie, moving up!

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    ^ Fixed f/4 also works with a 1.4x TC.
     
  6. puyjapin

    puyjapin TPF Noob!

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    so fixed means the aperture is not adjustable at all? nut the focal length is adjustable?
     
  7. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

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    No, what Alex is talking about...is a lens with a constant maximum aperture.

    For example, your lens has a maximum aperture of what; 4.5 to 5.6? The maximum aperture changes as you zoom the lens.
    A fixed/constant max. aperture lens would be something like the 70-200mm F2.8. It's maximum aperture is F2.8 all the way through the zoom range.

    With either lens, you can still adjust the aperture smaller...but the maximum is the important part to take note of.
     
  8. puyjapin

    puyjapin TPF Noob!

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    well u have enlightened me, sounds ideal, if i had the money!
     
  9. Battou

    Battou No longer a newbie, moving up!

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    I shoot with a 400mm prime on a film body (full frame), I generally try for roughly 30 to 70 feet from the subject with the occational 30 feet and under.

    lol had a sparrow push me back about ten feet the other day, he was inside minimum focusing range :lol:
     
  10. Garbz

    Garbz No longer a newbie, moving up!

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    While you technically don't need a fixed aperture the 70-300 would not work well with a teleconverter. The 1 stop drop in light would cause autofocus to give up completely, and on top of that at 300mm this lens is far from what I would consider sharp enough to bolt on a teleconverter.
     
  11. kundalini

    kundalini Been spending a lot of time on here!

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    IMO, a TC on that lens is not a smart purchase. Even with a 1.4TC, the degradation is likely to only piss you off with regard to IQ and then add on to that the drop in aperture.

    I do have a 300mm f/4 prime and a 1.7TC and the results are not that bad. But this is an apples and oranges comparison though.
     
  12. Montana

    Montana TPF Noob!

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    If you do not have the funds to get a prime lens longer than 300mm or a 300mm prime and a teleconverter, then I would suggest practicing patience. Seriously! Try sneaking slowly and patiently or hiding and letting the birds and animals come closer to you.

    I am a very impatient man, so I bought the 600mm f/4 IS and just in case I drank too much coffee that morning and am really on edge, I can slap my 1.4 teleconverter on. LOL
     

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