Sekonic Speedmaster L-858D-U Light Meter - Manual (Page 210)

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8. Optional Accessories
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Step-up Ring
You can attach the step-up ring (30.5 mm → 40.5 mm)
to the objective lens side to use a commercially available
filter. This allows you to determine the exposure without
troublesome correction calculation of the PL filter. PL filters
have the circular polarized light and polarized light types,
however, only the circular polarized light type can be used.
The step-up ring can also be used as a lens hood to protect
the spot lens from damage or dirt and avoid lens glare
which could cause incorrect light measurements etc.
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RT-EL/PX Transmitter
This transmitter, compatible with 2.4Ghz Elinchrom radio
system (EL-Skyport) and Phottix radio system (Strato II
protocol), separately requires a receiver for the relevant
system on the flash side. Installing the transmitter in
the L-858D enables to trigger the electronic flash units
wirelessly with radio signal for measurement. With EL-
Skyport system, it allows you to control the power of flash
units and modeling lamps as well as turn the power ON/
OFF of modeling lamps.
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RT-20PW
This transmitter, compatible with 344Mhz frequency of
PocketWizard radio system, separately requires a receiver
for the relevant system on the flash side.
Installing the transmitter in the L-858D enables to trigger
the electronic flash units wirelessly with radio signal for
measurement. With ControlTL system, it allows you to
control the power of flash units and turn the power ON/OFF
of modeling lamps.
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RT-3PW
This transmitter, compatible with 433Mhz frequency of
PocketWizard radio system, separately requires a receiver
for the relevant system on the flash side.
Installing the transmitter in the L-858D enables to trigger
the electronic flash units wirelessly with radio signal for
measurement. With ControlTL system, it allows you to
control the power of flash units and turn the power ON/OFF
of modeling lamps.