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28 mm questions

Discussion in 'Adapted Lenses' started by cpt000, Mar 11, 2012.

  1. cpt000

    cpt000 Mu-43 Regular

    64
    Mar 11, 2012
    Hi there...

    Am expanding my collection - currently have the Helios 58/2, Takumar 105/2.8 & the Panny 20/1.7 on my GF1.

    I read a lot about the nifty fiftys but recognize that's on a full frame sensor.

    If I wanted to achieve the same optical distance on the GF1, I'd need to get 25mm lens correct? Was pondering if I should pick up a Zuiko 28/2.8 or possibly a 24mm lens.

    Any thoughts?
     
  2. Amin Sabet

    Amin Sabet Administrator

    Apr 10, 2009
    Boston, MA (USA)
    If you want to get a lens that behaves like a 50mm lens on a 35mm format sensor, then a 25mm lens is what you're after. A number of 24mm and 28mm adapted manual focus lenses will work well.

    The two native 25mm lenses for our system are both expensive (PL 25/1.4 and CV 25/0.95). The Oly ZD regular (non-Micro) 4/3 25/2.8 is also an option. My hope is that we'll see an affordable native 25mm f/1.8 autofocus lens soon from Olympus, Panasonic, or possibly Sigma.
     
  3. dpj

    dpj Mu-43 Regular

    142
    Jul 20, 2011
    It would be fantastic for one of the M4/3 people to develope a 25mm f1.8 lens that comes in at the same price braket as the Canon/Nikon thrifty fifties. I adored my EF 50mm f1.8 on my 400D, it had nice Bokeh and at around f5.6/f8 it was pin sharp. It wasn't built too well being mainly plastic, but i think that was part of it's charm, and the fact it was sub £80 including shipping.
     
  4. wlewisiii

    wlewisiii Mu-43 Veteran

    238
    Dec 16, 2011
    Hayward, WI
    William Barnett-Lewis
    I have a Nikkor Pre-AI 24/2.8 that I use for this purpose. It's great because a) it was considered one of the finest wide angles of it's era and b) it's really cheap at KEH.com :)
     
  5. Jonathan F/2

    Jonathan F/2 Mu-43 Hall of Famer

    Aug 10, 2011
    Los Angeles, CA
    I sold my PL 25 1.4 and have been using my Nikon 28mm 2.8 AIS as a standard on my E-PM1. It works well and is much cheaper! :smile:
     
  6. webmonkey8

    webmonkey8 Mu-43 Regular

    39
    Jan 17, 2012
    Jonathan F/2 - what mount did you use for that Nikon 28mm 2.8? I didn't realize you could use non-mu43rd lenses with their bodies.
     
  7. cpt000

    cpt000 Mu-43 Regular

    64
    Mar 11, 2012
    Or maybe should I just skip it and get the Oly 45 1.8 instead...faster lens plus comes with AF too. Decisions, decisions....
     
  8. pictor

    pictor Mu-43 Top Veteran

    636
    Jul 17, 2010
    You want a normal lens. A normal lens is defined as a lens whose focal lengths equals the diameter of the sensor (or film) in mm. For µ4/3 the normal lens is 21.6 mm and therefore your 20 mm lens is quite perfect.

    However, the reality is not as easy. Once upon a time there were cameras (film cameras) with fixed 43mm lenses, which is the normal focal length of 35 mm film. The focal lengths of lenses being considered as normal lenses were increased during history and today we consider 25 mm on µ4/3 as the normal focal length. But it is still common to call any lens within the range from 20 mm to 25 mm on µ4/3 as normal focal lengths.
     
  9. pictor

    pictor Mu-43 Top Veteran

    636
    Jul 17, 2010
    Since you already own the 20mm, the 45mm is surely a great addition.
     
  10. Jonathan F/2

    Jonathan F/2 Mu-43 Hall of Famer

    Aug 10, 2011
    Los Angeles, CA
    I just use a Nikon F-mount to M43 adapter. Works very well. I also have a Nikon kit, so my Nikon MF glass is compatible with all my cameras.
     
    • Like Like x 1
  11. dbuckle

    dbuckle Mu-43 Hall of Famer

    The Nikon 28mm 2.8 is excellent but if money isn't real tight the 28mm f2 is a real gem.
     
    • Like Like x 1
  12. cpt000

    cpt000 Mu-43 Regular

    64
    Mar 11, 2012
    Another question: does the "45" on the Oly 45 1.8 mean that it's equivalent to a true 45 on a FF sensor or does that equate to a 90mm on a FF sensor?
     
  13. pictor

    pictor Mu-43 Top Veteran

    636
    Jul 17, 2010
    45mm is the focal length, which is a physical size independent of sensor sizes. However, due to the smaller sensor, the angle of view of 45mm on µ4/3 is narrower than 45mm on full frame. If you want the same angle of view as a 90mm on full format, you have to take a 45mm on µ4/3. That means, that the Oly 45mm equals a 90mm on full frame.
     
  14. LVL8hacker

    LVL8hacker Mu-43 Veteran

    322
    Jan 4, 2012
    Pinehurst, North Carolina
    Larry Anderson
    Or in simple terms. All lenses you get for your M4/3 cameras will double in focal length. ie...50mm = 100mm, 40mm = 80mm and so on. This is due to the 2X crop on a M4/3 sensor
     
    • Like Like x 1
  15. pictor

    pictor Mu-43 Top Veteran

    636
    Jul 17, 2010
    I don't think that one should tell beginners wrong things just because they are simple. 50mm on µ4/3 is not equal to 100mm on full frame, it is equivalent to it! I am also sure that cpt000 understands the difference between equality and equivalence.
     
  16. LVL8hacker

    LVL8hacker Mu-43 Veteran

    322
    Jan 4, 2012
    Pinehurst, North Carolina
    Larry Anderson
    Yes sir ...all though I never said a word about full frame. I simply said what ever lens he puts on his m4/3 body will double in focal length.
     
    • Like Like x 1
  17. cpt000

    cpt000 Mu-43 Regular

    64
    Mar 11, 2012
  18. pictor

    pictor Mu-43 Top Veteran

    636
    Jul 17, 2010
    So what doubles? What do you mean by that without referring to full frame? What do you mean by "2X crop on a M4/3 sensor" without referring to full frame?