is there a chart? Lens conversion

Discussion in 'Photography Beginners' Forum' started by Happy Hour, Dec 22, 2007.

  1. Happy Hour

    Happy Hour TPF Noob!

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    Just wondering if there is a chart that tells you what the lens conversion is from a 35mm to a dlsr? Like my Minolta 50mm is actually a 75mm on my Alpha. Is there anything like this out there? So i don't have to keep asking every time I find a lens I want?
     
  2. JerryPH

    JerryPH No longer a newbie, moving up!

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    Why is this even needed? No one purchases lens using cropped sensor numbers.

    Do you know the cropped sensor size of your camera or do you know the ratio?

    It is usually 1.5 for Nikons and 1.3 or 1.6 for Canons.

    Also... your zoom amount doesn't change, just the field of vision (width and height).
     
  3. Josh66

    Josh66 Been spending a lot of time on here!

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    Just multiply by 1.6 (or whatever factor your camera needs), no chart needed - unless you're not good at multiplication, but then you could make your own chart.
     
  4. Happy Hour

    Happy Hour TPF Noob!

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    I am buying minolta lenses for my sony alpha a100 I know that the lens is different on a alpha than it is on a 35mm like my 50mm f/2.8 is like a 75mm f2.8, and my 80-200 is like 125-300. So I found a bunch of lenses and want to know what they convert to on my alpha. But I don't want to have to post a question a bug everyone every time I find a lens. I believe mine is a 1.5 but how does that tell me what I need to know? I honestly have no idea what you mean by cropped sensor numbers. I'm just starting out and am reading and learning more everyday. Thanks for the help
     
  5. Happy Hour

    Happy Hour TPF Noob!

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    Ok just so I don't fudge this up if i'm looking at a 80-200mm and my camera is 1.5 I multiply the 80 by 1.5 then the 200 by 1.5 and thats my conversion?which is 120 x 300 am i right?
     
  6. Josh66

    Josh66 Been spending a lot of time on here!

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    50mm x 1.5 = 75mm. It's as simple as that.
     
  7. Josh66

    Josh66 Been spending a lot of time on here!

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    Yup, that's right. And if you do suck at multiplication (no offense intended) 1.5 is easy. Just add half of the number. 80 x 1.5 is the same as 80+40. It's pretty simple, but some people have trouble with it...
     
  8. Happy Hour

    Happy Hour TPF Noob!

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    Wow i didn't realize it's that simple! Thank you for explaining it to me!! and the f stop doesn't change right?
     
  9. Josh66

    Josh66 Been spending a lot of time on here!

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    F stop will be the same, the hole in the lens is the same size as it always was. (And the focal length is the same too, really. You're just cropping off the edges of the image.)
     
  10. Sideburns

    Sideburns TPF Noob!

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    no, the aperture is the same. But one thing you should know...
    Forget about the conversions for now. If you want a lens, try it out...if it works, it works.

    Say you have a 50mm.
    If you want longer, you'd get 100mm, 135mm, 200mm, 300mm....whatever...if you want shorter, you'd get 35mm, 28mm, 14mm....

    You don't technically have to convert the lens to the "equivalent" to know if you should get it or not. Just trying to simplify things...
     
  11. Happy Hour

    Happy Hour TPF Noob!

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    Thanks sideburns! It's mainly I keep finding new lenses around the house and we were talking about teleconverters well I found a lens that gives me more than the teleconverter would for $30 on ebay
     
  12. Sideburns

    Sideburns TPF Noob!

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    Well if it's 30 dollars on ebay, it's most likely not that good.
    I know they have lots of phoenix and quantaray stuff online for cheap....but I personally wouldn't buy it. I'm not saying don't...but I wouldn't expect the highest of quality.

    Want to give the specifics? what's the lens you found? What lens and what teleconverter are you comparing to?
     

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