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Thread: Should I buy a 50mm f1.8 when I have a 17-70 f2.8?

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    Default Should I buy a 50mm f1.8 when I have a 17-70 f2.8?

    If I shoot at 50mm, will the 50mm f1.8 stepped down to f4 have advantage over my 17-70 f2.8 @ 50mm f4. Will the depth of field be the same and will it have advantage in low light situtation?

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    Moderator daredevil123's Avatar
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    Default Re: Should I buy a 50mm f1.8 when I have a 17-70 f2.8?

    Quote Originally Posted by maisatomai View Post
    If I shoot at 50mm, will the 50mm f1.8 stepped down to f4 have advantage over my 17-70 f2.8 @ 50mm f4. Will the depth of field be the same and will it have advantage in low light situtation?
    At 50mm, and F4, on the same camera, both lenses will give you the the same depth of field, as well as low light performance. No low-light advantage whatsoever.

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    Default Re: Should I buy a 50mm f1.8 when I have a 17-70 f2.8?

    Quote Originally Posted by maisatomai View Post
    If I shoot at 50mm, will the 50mm f1.8 stepped down to f4 have advantage over my 17-70 f2.8 @ 50mm f4. Will the depth of field be the same and will it have advantage in low light situtation?
    may i know what brand of lens is your 17-70 f2.8? thanks
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    Default Re: Should I buy a 50mm f1.8 when I have a 17-70 f2.8?

    Quote Originally Posted by daredevil123 View Post
    At 50mm, and F4, on the same camera, both lenses will give you the the same depth of field, as well as low light performance. No low-light advantage whatsoever.
    Unless looking thru the viewfinder and see that it's brighter is an advantage.
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  5. #5

    Default Re: Should I buy a 50mm f1.8 when I have a 17-70 f2.8?

    unless you wanna take photos at f1.8
    or
    you want a lighter smaller alternative for street photog

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    Moderator rhino123's Avatar
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    Default Re: Should I buy a 50mm f1.8 when I have a 17-70 f2.8?

    Quote Originally Posted by maisatomai View Post
    If I shoot at 50mm, will the 50mm f1.8 stepped down to f4 have advantage over my 17-70 f2.8 @ 50mm f4. Will the depth of field be the same and will it have advantage in low light situtation?
    Bro... I believe your 17-70mm is Sigma's 17-70... which is a variable aperture lens (of course I might be wrong). So if it was the case, then at 50mm on your 17-70mm, it will not be f2.8. however at f4, the DOF should be the same for both the 17-70mm at f4 and 50mm at f4. Sharpness wise differ but I am leaning towards the 50mm.
    I am not a photographer, just someone who happened to have a couple of cameras.
    My lousy shots

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    Default Re: Should I buy a 50mm f1.8 when I have a 17-70 f2.8?

    i feel that since 50mm f1.8 is so cheap, no harm getting it.. at least it is 1.25 stop faster than f2.8.. it will help in low light and bokeh..

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    Senior Member digitalpimp's Avatar
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    I can't count the times when I wish I brought my f1.x with me on a trip. Just two days ago I was trying to do night street photography in those narrow alleyways in Bangkok. f2.8 and ISO1600 just couldn't cut it. Ended up with a big fat fail. So yea, get it. It's cheap anyway.
    Last edited by digitalpimp; 7th September 2011 at 12:57 AM.

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    Quote Originally Posted by digitalpimp
    I can't count the times when I wish I brought my f1.x with me on a trip. Just two days ago I was trying to do night street photography in those narrow alleyways in Bangkok. f2.8 and ISO1600 just couldn't cut it. Ended up with a big fat fail. So yea, get it. It's cheap anyway.
    Heard of manual focus during night shots?

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    Senior Member digitalpimp's Avatar
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    Quote Originally Posted by rvf79

    Heard of manual focus during night shots?
    Not the focusing but the speed of the people walking I had problems with. I wanted faster shutter speeds to freeze motion. Heard of it?
    Last edited by digitalpimp; 7th September 2011 at 01:25 PM.

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    Senior Member ZerocoolAstra's Avatar
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    Default Re: Should I buy a 50mm f1.8 when I have a 17-70 f2.8?

    Quote Originally Posted by rvf79 View Post
    Heard of manual focus during night shots?
    want to be sarcastic also must think properly first
    Exploring! :)

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    Quote Originally Posted by digitalpimp

    Not the focusing but the speed of the people walking I had problems with. I wanted faster shutter speeds to freeze motion. Heard of it?
    U never say people walking ma.

    Then increase the iso then pp lo.

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    Senior Member digitalpimp's Avatar
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    Quote Originally Posted by rvf79

    U never say people walking ma.

    Then increase the iso then pp lo.
    Sorry, but don't take lessons from people who call a watermark 'name stamp'.

    Trust me, I know what I'm talking about.

    Your sarcasm isn't appreciated. You pushed, I just pushed back.

    And yea, I don't need to explain anything to you. You're not even the thread starter.
    Last edited by digitalpimp; 7th September 2011 at 06:13 PM.

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    Senior Member ZerocoolAstra's Avatar
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    Default Re: Should I buy a 50mm f1.8 when I have a 17-70 f2.8?

    Quote Originally Posted by rvf79 View Post
    U never say people walking ma.

    Then increase the iso then pp lo.
    Wow...
    wise words indeed...

    so if people not walking, manual focus will help in dark scenes har?
    Exploring! :)

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    Moderator daredevil123's Avatar
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    Default Re: Should I buy a 50mm f1.8 when I have a 17-70 f2.8?

    Quote Originally Posted by ZerocoolAstra View Post
    Wow...
    wise words indeed...

    so if people not walking, manual focus will help in dark scenes har?
    No need to buy D3s and F1.4 lenses already... lets all manual focus!!! LOL

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    Quote Originally Posted by ZerocoolAstra

    Wow...
    wise words indeed...

    so if people not walking, manual focus will help in dark scenes har?
    U will also need 哆啦A梦's stopwatch
    Equipment: D800|D700|11-16|28-75|105 Micro VR|50 F1.4G|85 F1.8G
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  17. #17

    Default Re: Should I buy a 50mm f1.8 when I have a 17-70 f2.8?

    Quote Originally Posted by Cowseye View Post
    U will also need 哆啦A梦's stopwatch
    I got the 哆啦A梦......can lend u if you want.

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    Member GReddyZC76's Avatar
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    Yawnz +1
    Last edited by GReddyZC76; 24th September 2011 at 01:37 PM.
    [D800|AFS2470F2.8G|AFS70200F2.8G|AFS1635F4G|AFS28F1 .8G|AF85F1.8D|AFDC105F2D|SB700|SB900]

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    Moderator rhino123's Avatar
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    Default Re: Should I buy a 50mm f1.8 when I have a 17-70 f2.8?

    Quote Originally Posted by digitalpimp View Post
    I can't count the times when I wish I brought my f1.x with me on a trip. Just two days ago I was trying to do night street photography in those narrow alleyways in Bangkok. f2.8 and ISO1600 just couldn't cut it. Ended up with a big fat fail. So yea, get it. It's cheap anyway.
    Just a tot, bro... if you step up your ISO to around ISO3200 or more, maybe f2.8 will cut it. As for the amount of noise in the pic, we can always use pp to cut away the chroma noise...

    Just a tot. However if people are walking very fast or your speed cannot reach fast enough, then very difficult to freeze motion.
    I am not a photographer, just someone who happened to have a couple of cameras.
    My lousy shots

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    Senior Member digitalpimp's Avatar
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    Quote Originally Posted by rhino123

    Just a tot, bro... if you step up your ISO to around ISO3200 or more, maybe f2.8 will cut it. As for the amount of noise in the pic, we can always use pp to cut away the chroma noise...

    Just a tot. However if people are walking very fast or your speed cannot reach fast enough, then very difficult to freeze motion.
    Arggh 3200... Let's just say I'm not crazy about Sony's NR performance. Higher ISO will definitely help, but the noise is just too much at 3200 on the A700. I'll consider as soon as I upgrade. I heard the new algorithms can do magic.

    Not walking very fast lah. It's really a case to case basis and a different topic altogether.
    Last edited by digitalpimp; 8th September 2011 at 10:50 AM.

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