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FORUMS General Gear Talk Changing Camera Brands 
Thread started 15 Nov 2017 (Wednesday) 09:51
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Fuji vs Sony vs Olympus

 
Wilt
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Post edited 3 months ago by Wilt. (5 edits in all)
     
Feb 23, 2018 09:38 |  #31

OK, the speed booster changes the FL of the lens by 0.71x without changing the diameter of the aperture, so the max f/stop is changed to a larger one in terms of f/number

50mm f/2 (25mm diameter aperture), with speedbooster yields 35.5mm with 25mm diameter aperture or 35.5/25 = f/1.4

Put that on a 4/3 format body and you have the FOV equivalent to using

  • 70mm FL on FF body or
  • 44mm FL on APS-C body or
  • 35.5mm on 4/3 body


In terms of DOF, at a shooting distance of 10'
  • 70mm f/2 on FF body sees FOV of 3.4' x 5.1', with 20/20 visual acuity DOF range of 3.1"
  • 35.5mm f/1.4 on 4/3 body sees FOV of 3.4' x 5.1', with 20/20 visual acuity DOF range of 5.35"

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    Feb 23, 2018 17:41 |  #32

    Wilt wrote in post #18570402 (external link)

    • 44mm FL on APS-C body

    There are two different APS-C sensor sizes (that I know of), I mean come on Wilt! :-P

    Just *1.4 the focal length and aperture (for DOF) T/he camera will take care of the exposure balance for you.

    But yea, mirrorless rock you should totally try one out for a while.


    Fuji: X-PRO2, X-T1, X-E2 | 16/1.4, 18/2, 23/1.4, 35/1.4, 56/1.2, 90/2, 16-55/2.8, 10-24/4. AD600BM, TT865F, AL-H198, ThinkTank AS2, Peli1514, Ona Bowery, Matthews Grip
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    JeffreyG
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    Feb 23, 2018 18:01 |  #33

    sporadic wrote in post #18570318 (external link)
    I had no idea that Canon was making medium format cameras either :) My point being, the norm is what you make it. I stopped thinking about 35mm equivalent conversion factors once I migrated to Fuji. I shoot what's available for the system and all the X glass is designed for the same sensor format. For me, my 35/1.4 is my "standard prime". I try not think about it as a ~50mm equivalent since APS-C is my norm. Just a change in mindset. Much easier to do once you get out of a mixed sensor size family like Canon. Was odd coming from an Elan IIe to a crop DSLR and all my EF glass being tighter, but I've since adjusted.

    I just want to point out, this is a really good post. Here is the thing.....the term "full frame" is totally legit and useful within the realm of Canon and Nikon's established lens lines. Both companies have established extensive lens systems designed around the 35mm format. This means that 35mm format is "full frame' for users within these lens systems, and will offer the best possible performance with the lenses that exist in their systems.

    Fuji's "full frame" is smaller than 35mm format. This does indeed give up some performance against the best of the best in 35mm format, which in turn gives up some performance against the best of the best in medium format.

    But, a lot of people are finding that high end Fuji lenses with high end Fuji bodies are very much good enough for what they are doing. That isn't a huge surprise, resolution (bodies and lenses) have come a long way.


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    Wilt
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    Post edited 3 months ago by Wilt.
         
    Feb 23, 2018 18:07 |  #34

    Two Hot Shoes wrote in post #18570693 (external link)
    There are two different APS-C sensor sizes (that I know of), I mean come on Wilt! :-P

    The conversion arithmetic gets tiresome, so I don't bother with precision. The concept of an optic that changes FL (vs. not changing the aperture diameter) is all I was interested in showing, and the very different result in DOF zone depth in spite of the numeric value of the f/stop in spite of equivalent fields of view across multiple format sizes.


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    Feb 23, 2018 18:26 |  #35

    JeffreyG wrote in post #18570709 (external link)
    Fuji's "full frame" is smaller than 35mm format. This does indeed give up some performance against the best of the best in 35mm format, which in turn gives up some performance against the best of the best in medium format.

    I think these days Fujis 'Full Frame' is a bit fuller than a 35mm format.


    Fuji: X-PRO2, X-T1, X-E2 | 16/1.4, 18/2, 23/1.4, 35/1.4, 56/1.2, 90/2, 16-55/2.8, 10-24/4. AD600BM, TT865F, AL-H198, ThinkTank AS2, Peli1514, Ona Bowery, Matthews Grip
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    Fuji vs Sony vs Olympus
    FORUMS General Gear Talk Changing Camera Brands 
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