X-H1 IBIS + Focal Reducer / Speedbooster (&Fast glass): My experience

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SjorsDW Regular Member • Posts: 133
X-H1 IBIS + Focal Reducer / Speedbooster (&Fast glass): My experience

Since I couldn't find anything online about this I wanted to share my experience.

As you X-H1 users probably know setting FL in "Mount Adaptor Settings" for adapted lenses is important for the IBIS to work properly.

Since the FL is set for the Full frame equivalent on a crop. This means if you use a normal adaptor in combination with 100mm FF lens you need to set the Mount Adaptor Settings on 100, which is 150mm on the X-H1s crop sensor.

When a speedbooster is used (e.g. Metabones) this is the calculation for a 100mm FF lens:

100mm * 1.5 (APS-c crop factor) = 150
150 * 0.71 (focal reducer) = 106

So I usually set 106mm on my X-H1 with good results for both long lenses as WA. I wonder what other X-H1 users experience!?

In addition I wonder if the claim for the SPEED advantage really counts for fast lenses like this 55mm 1.2. I don't seem to get the same advantage using the booster compared (in relation) to my 50mm 1.8.

 SjorsDW's gear list:SjorsDW's gear list
Fujifilm X-T1 Fujifilm X-H1 Nikon AF Nikkor 85mm f/1.8D Fujifilm XF 35mm F1.4 R Fujifilm XF 18-55mm F2.8-4 R LM OIS +8 more
Fujifilm X-H1
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