OM-D E-M1 Mark IIIPreview
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FRK

FRK stands for Focus Ring Lock on the Olympus E-M1 Mark III display. It is a feature that allows you to lock the focus ring of certain lenses to prevent accidental changes in focus. You can enable or disable this feature by pressing and holding the Fn1 button for 2 seconds³.

Source: Conversation with Bing, 08/04/2023(1) Advanced AF system and high speed performance E-M1 Mark III | OM-D .... https://asia.olympus-imaging.com/product/dslr/em1mk3/feature3.html Accessed 08/04/2023.

(2) Olympus E-M1 III review: Fast, but way behind flagship ... - Engadget. https://www.engadget.com/2020-02-12-olympus-e-m1-iii-review.html Accessed 08/04/2023.

(3) Our Olympus EM1 Mk III Review Got an Important Update. https://www.thephoblographer.com/2022/08/11/our-olympus-em1-mk-iii-review-got-an-important-update/ Accessed 08/04/2023.

(4) OM-1 v E-M1 Mark III; 9 key differences – DigitalRev. https://digitalrev.com/2022/03/15/om-1-v-e-m1-mark-iii-9-key-differences/ Accessed 08/04/2023.

(5) Olympus OM-D E-M1 Mark III review: Digital Photography Review. https://www.dpreview.com/reviews/olympus-om-d-e-m1-mark-iii-review Accessed 08/04/2023.

According to web search results, not all Olympus lenses support the focus ring lock feature. Only some lenses that have a dedicated lock/unlock ring or a clutch mechanism can use this feature. Some examples of lenses that support this feature are:

You can check the specifications of each lens on the Olympus website or the user manual to see if they support the focus ring lock feature.

Source: Conversation with Bing, 08/04/2023(1) Which lenses are compatible with the Focus Stacking mode? | Olympus. https://learnandsupport.getolympus.com/node/1732 Accessed 08/04/2023.

(2) Olympus M.ZUIKO Digital ED 12-100mm f/4.0 IS Pro Review. https://www.photographyblog.com/reviews/olympus_m_zuiko_digital_ed_12_100mm_f_4_is_pro_review Accessed 08/04/2023.

(3) Olympus 100-400mm vs Panasonic 100-400mm – The complete comparison. https://mirrorlesscomparison.com/micro-four-thirds-lenses/olympus-100-400mm-vs-panasonic-100-400mm/ Accessed 08/04/2023.

(4) The best Olympus lenses (OM System) in 2023 - digitalcameraworld. https://www.digitalcameraworld.com/buying-guides/best-olympus-lenses Accessed 08/04/2023.