1. sparker

    sparker

    Messages:
    219
    Name:
    Simon
    Edit My Images:
    Yes
    Good morning,

    As title really, what size lens in DSLR terms is closest to the 50mm lens in SLR? Does that make sense?

    Thanks
    Simon
     
    donetello likes this.
  2. Andrew Moore

    Andrew Moore

    Messages:
    1,012
    Name:
    Andrew
    Edit My Images:
    Yes
    Depends on sensor.

    Micro four thirds M43 would be 25mm
    Crop (APSC) would be 35mm
    Full frame (35mm) would be 50mm
    Medium format would be anything from about 63 to 80 depending on sensor size.
     
    omens likes this.
  3. woof woof

    woof woof

    Messages:
    18,361
    Name:
    Alan
    Edit My Images:
    No
    If you have a Canon APS-C then it's focal length / 1.6 so 31.25mm is the Canon APS-C equivalent of full frame 50mm.

    If you have Nikon APS-C it's 50/1.5 so 33mm is the Nikon APS-C equivalent of 50mm on FF.

    If you have MFT the crop is x2 so a 25mm lens would be the equivalent of 50mm on FF.

    If you have a FF DSLR then 50mm is 50mm :D

    Sorry to repeat what Andrew said, I must have been typing as his reply appeared :D
     
    Last edited: Apr 29, 2018
    omens and Andrew Moore like this.
  4. Carousels Spin

    Carousels Spin

    Messages:
    306
    Edit My Images:
    No
    It depends of the crop factor, which is determined by sensor size. A full frame DSLR will be the same as the 35mm format, ie it would still be a 50mm lens. Assuming you mean a crop sensor DSLR, which is a crop factor of about 1.5x, 35mm will be what you're after. M43 cameras have a crop factor of 2x, so they need a 25mm lens.
     
  5. PhilH04

    PhilH04

    Messages:
    670
    Name:
    Phil
    Edit My Images:
    No
    A new 50mm lens ;) :exit:
     
    john.margetts, ecoleman and Ceejay like this.
  6. sparker

    sparker

    Messages:
    219
    Name:
    Simon
    Edit My Images:
    Yes
    Thank you all very much.
     
  7. ecoleman

    ecoleman

    Messages:
    4,588
    Name:
    Elliott
    Edit My Images:
    No
    50mm is 50mm regardless of what camera you attach it to.
    The only thing that changes, depending on the sensor size is the field of view which has been explained above.
     
    holty likes this.
  8. Teflon-Mike

    Teflon-Mike

    Messages:
    988
    Name:
    Mike
    Edit My Images:
    Yes
    I assume the question, is: "what is the 'normal-angle' lens length for.....{insert camera format of interest}"
    It 'depends' on the projection-plane.... ie film size or sensor dimensions.
    The 'rule of thumb, is that the 'normal' angle lens is one with a focal lenth the same as the diagonal of the focal plane.....
    On a 35mm film camera or 'full-frame' widgetal, the film-trap is 24mm x 36mm, and the diagonal of that is.... 43mm.. BUT that film-trap/sensor is oblong.... take the long-side, 36mm and make a square that size, the diagonal is nie on 50mm. Go Medium format, and with 6cm wide film, you can put an oblong on that either side of a square, from 4.5x6, 6x6 or 9x6... and the 'normal lens, can be anything from 75mm to 110mm.. if you go by the actual diagonal, not the square of the longest side....
    Make sense?

    An APS-C sensor is sized on the old APS sized film, which like 120 offered some alternative masking frames on film aprox 24mm wide,(as oposed to 35mm for 35mm, or 6cm for 120 roll-film), which like medium format gave a range of potential 'normal' angle lenses by the strict diagonal, or the diagonal of long-side square.... 'around' 35mm..
    Which, taking the Nikon 16x24mm croip sensor is 'about' its normal angle lens-length... give or take.... and anything in the 30-40mm region is about the 'normal-angle' for a crop-sensor camera....

    BUT, a lens is a lens is a lens, and its focal length is its focal length.... the 'equivalence' this gives is ONLY for the angle of framing. A 50mm lens is still a 50mm lens whether its got a 35mm sized 24x36mm film trap behind it, a 16x24mm digi-sensor or a 6x5cm bit of roll-film.. the focus you get, the perspective you get, the Depth-of-field you get is the same... all that changes is how much you lop off the top-bottom-and-edges in the 'crop' to get the same effective framing or angle of view... and that''s as far as the 'equivalence' goes.
     
  9. ABTog

    ABTog

    Messages:
    799
    Name:
    Alistair
    Edit My Images:
    No
    Seriously Mike, you need to keep your answers a bit shorter. Particularly as this is the beginners section, you're likely to bamboozle them and they'll get lost, even if the answer is in there somewhere.
     
    UKmitch86, Graham W and Nod like this.

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