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  1. #1
    Senior Member

    Zoom comparison

    I've decided to spend a good 1000$ give or take a couple hundred on a nice lens, my top 2 picks so far are the (AF-S VR Micro-Nikkor
    105mm f/2.8G IF-ED) and the (AF-S VR Zoom-Nikkor 70-300mm f/4.5-5.6G IF-ED) I've started looking at the (AF Nikkor 180mm f/2.8D IF-ED) idk why, I just like lenses with low apertures, and finally I noticed the (AF-S NIKKOR 200-500mm f/5.6E ED VR) also I noticed with this FX lens it is comparable to a 750mm zoom on a DX camera, not sure how that works but would it really 'zoom' farther than a 650mm zoom? I'm liking the 200-500 because right now I have the 18-140 so I'm pretty good up to 140 I think and the 70-300 seems like less coverage since I already have the 70-140 range covered,


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  2. #2
    Senior Member

    Re: Zoom comparison

    Quote Originally Posted by Karn View Post
    and finally I noticed the (AF-S NIKKOR 200-500mm f/5.6E ED VR) also I noticed with this FX lens it is comparable to a 750mm zoom on a DX camera, not sure how that works but would it really 'zoom' farther than a 650mm zoom?
    No, fx or dx lens will look the same on your camera for a given focal length. The FX lens just has more glass and will better cover an FX sensor. The DX sensor is smaller and captures less of the image cast upon the sensor plane. That cropped dx image is then enlarged to a standard size, giving a zoom-like affect. Its really just a lesser field of view due to the smaller sensor. Your dx body is giving you the 1.5 zoom-like effect, not the lens.
    I must have a really good camera.

  3. #3
    Senior Member

    Re: Zoom comparison

    So would a DX lens be overall better for a DX camera or do FX lenses work just as good if not better on a DX camera?

  4. #4
    Senior Member
    Dawg Pics's Avatar

    Re: Zoom comparison

    Yup, I really think that is a flawed comparison.
    If you enjoy shooting small things like birds, then you won't be cropping as much with the DX sensor because the image size is smaller to begin with. If you want to be closer to the subject, then you need a bigger zoom no matter what camera body you use.
    Good luck with your decision.
    "Remember to gaze up at the night sky because there is a little bit of the cosmos in each of us."


    Um yeahhhh, I shoot a lot of pics of my dogs.
    D500 (DOB 05/26/17), D300, D80, D100 R.I.P., SB-800

  5. #5
    Senior Member

    Re: Zoom comparison

    A dx lens will not be better but it probably won't be worse either. An FX lens is pricier. It will be heavier. It will still work for you if you move on to an FX body. It MIGHT give you a better image on a DX, but probably not enough to be the sole reason you buy it. I say it might give a better image because lenses tend to not be as sharp in the corners and since the fx lens is designed for a larger sensor, your dx sensor will be capturing what might be the best part of the image.
    Best Answers Bikerbrent voted best answer for this post
     
    I must have a really good camera.

  6. #6
    Senior Member
    Dawg Pics's Avatar

    Re: Zoom comparison

    @nickt
    Great explanation of the zoom effect. I haven't heard anybody explain the part about the image being enlarged to standard size giving the zoom effect. Thanks.
    "Remember to gaze up at the night sky because there is a little bit of the cosmos in each of us."


    Um yeahhhh, I shoot a lot of pics of my dogs.
    D500 (DOB 05/26/17), D300, D80, D100 R.I.P., SB-800

  7. #7
    Senior Member
    Bikerbrent's Avatar

    Re: Zoom comparison

    Quote Originally Posted by nickt View Post
    A dx lens will not be better but it probably won't be worse either. An FX lens is pricier. It will be heavier. It will still work for you if you move on to an FX body. It MIGHT give you a better image on a DX, but probably not enough to be the sole reason you buy it. I say it might give a better image because lenses tend to not be as sharp in the corners and since the fx lens is designed for a larger sensor, your dx sensor will be capturing what might be the best part of the image.
    This is a very good reply. One thing nickt left out is that Nikon does not make any DX lenses of the same optical quality as the professional FX lenses. For example there is no Nikon DX equivalent to the Nikon 24-70mm F2.8 or 70-200mm F2.8
    Thanks/Like nickt Thanks/liked this post
     
    Brent: Poway, CA
    D7200, D200, D70, F100
    Tokina 12-24mm
    Nikon 18-200mm
    Nikon 18-70mm
    Tokina 28-70mm f2.6-2.8
    Nikon 80-200mm f2.8
    Sigma 150-600mm
    Nikon 50 AF f1.8
    Tokina 100mm f2.8 Macro
    Nikon SB800

  8. #8
    Senior Member

    Re: Zoom comparison

    Quote Originally Posted by Dawg Pics View Post
    Great explanation of the zoom effect. I haven't heard anybody explain the part about the image being enlarged to standard size giving the zoom effect. Thanks.
    Thanks! I tried a 35mm film analogy to explain it here the other day:
    https://nikonites.com/d7500/41124-fx...tml#post655396
    I must have a really good camera.

  9. #9
    Senior Member
    Dawg Pics's Avatar

    Re: Zoom comparison

    Quote Originally Posted by nickt View Post
    Thanks! I tried a 35mm film analogy to explain it here the other day:
    https://nikonites.com/d7500/41124-fx...tml#post655396
    Makes perfect sense to me.
    "Remember to gaze up at the night sky because there is a little bit of the cosmos in each of us."


    Um yeahhhh, I shoot a lot of pics of my dogs.
    D500 (DOB 05/26/17), D300, D80, D100 R.I.P., SB-800

  10. #10
    Senior Member
    Woodyg3's Avatar

    Re: Zoom comparison

    Quote Originally Posted by Bikerbrent View Post
    This is a very good reply. One thing nickt left out is that Nikon does not make any DX lenses of the same optical quality as the professional FX lenses. For example there is no Nikon DX equivalent to the Nikon 24-70mm F2.8 or 70-200mm F2.8
    I don't own one, but the Nikon 17-55mm f/2.8 is supposed to be a sharp and well made DX lens. And, it should be for $1500.00.

    That said, the Tamron and Sigma 17-50 or 17-70 lenses might be even better optically for a fraction of the cost. Don't tell anyone, though. It's a secret!
    Last edited by Woodyg3; 01-31-2018 at 10:52 PM.
    Thanks/Like Danno Thanks/liked this post
     
    Woody Green

    Clear Eyes, Full Hearts, Can't Lose

    D500, D7200, D7100, D70





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