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You are here: Home / GFX 50S / Fujifilm GFX with 63/2.8 wide-open MF

Fujifilm GFX with 63/2.8 wide-open MF

April 18, 2017 JimK 3 Comments

This is the 36th in a series of posts on the Fujifilm GFX-50S. The series starts here.

After looking at yesterday’s results for stopped-down manual focusing with the 63 mm f/2.8 lens on the Fujifil GFX 50S and noting that, in my longitudinal chromatic aberration (LoCA) testing, the Fuji 63 didn’t appear to have much, Erik Kaffehr suggested that focusing wide open mide be a better strategy for that lens. 

I gave it a try, with the same methods as in yesterday’s post:

The blue columns are for focusing manually wide open. The orange ones are for manual focusing stopped down to taking aperture, and the gey ones are for autofocusing, using AF-S with a 750 m-sec half-press. All are average values. Target distance was 3 meters. The target was well-lit, and the f/2.8 exposure was 1/640 second at ISO 100. Files developed in Lightroom with default settings except for custom white balance. 

It looks like Erik was on to something. The focus shift could be different at long distances, however. I have no way to do slanted edge testing at long distances. 

While I was running these tests, I thought it might me a good idea to focus once wide open, then make a series of exposures stopping down by a third of a stop each time. Here’s what I got for two such series:

The f-stops are the horizontal axis. It looks about as you’d expect, except for that glitch at f/5. I don’t know what that’s about. 

GFX 50S, The Last Word

← Fujifilm GFX with 63/2.8 MF accuracy Fujifilm GFX/63 focus instability →

Trackbacks

  1. Fujifilm GFX with 120/4 wide-open MF says:
    April 18, 2017 at 8:45 pm

    […] an earlier post today, I determined that focusing the Fuji 63 mm f/2.8 manually wide open was a good choice. The focus […]

    Reply
  2. Fujifilm GFX 50S focusing — summary to date says:
    April 19, 2017 at 2:08 pm

    […] The best strategy for manually focusing the 63 mm f/2.8 lens is to focus wide open. That doesn’t work with the 120. The best way to deal with the 120 macro is to focus at taking aperture, or maybe slightly open from there. […]

    Reply
  3. Impressive Fujinon GF 110mm F 2 R LM WR Samples, GFX 50S vs Sony a7RII Moire Test and GFX Focus Problem Wrap-up | Fuji Addict says:
    April 21, 2017 at 10:45 am

    […] GFX with 120/4 AF accuracy The Last Word – Fujifilm GFX/63 focus instability The Last Word – Fujifilm GFX with 63/2.8 wide-open MF The Last Word – Fujifilm GFX with 63/2.8 MF […]

    Reply

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