Safety Instructions For In-Camera Filtration; Maximum Lens Mounting Depth - ARRI ALEXA Series User Manual

In-Camera Filter Module IFM-1

17.1.1 Safety instructions for in-camera filtration

17.1.1.1 Maximum lens mounting depth

Proper shimming is crucial for the safe use of in-camera filters. Only
correct shimming ensures the proper flange focal depth.
Only cameras with the original IFM-1 Shim allow for 31.50 mm
maximum lens mounting depth of PL mount lenses, when using in-
camera filters.
To avoid damage or injury when using PL mount lenses, use only
lenses that do not exceed the following dimensions:
Figure 137: Allowed lens dimensions with in-camera filters
For a safe and correct use of internal filters, always shim your camera
properly.
Observe all precautions and use only proper tools, lenses and
materials
For PL mount lenses, use only lenses with 31.50 mm maximum
mounting depth
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