Does anyone know if the custom switch (by way of the lens dock) can be programmed to toggle between crop mode and full frame mode?

This should be available in-camera via the menu system. Make sure the lens is attached, and the option to customize that button will appear in the Custom Key menu.

Is this a necessity or is this optional?

It is optional. I bought it but have not used it yet. That said, I anticipate using it since Samyang and Rokinon constantly provide with firmware updates that improve considerably the performance of their lenses (AF speed, AF reliability, etc.) So, if you get rokinon /Samyang lenses with AF this may be needed to get the most out of those lenses. On the other hand, if you are buying MF lenses from Rokinon / Samyang it does not make sense I think to get this.

Where are the fine-tuning instructions to be found for this lens station., for even customer service at rokinon is embarrassingly clueless?

It's the same as with a DSLR. Take a photo of a stationary object with the camera and lens on a tripod, analyze it to see if it's properly in focus, and if not, adjust the fine tuning to correct it using further test shots. 99.9% of the time, this does not need to be changed, as mirrorless doesn't have focusing issues like DSLRs did. The lens is tuned from the factory to focus as close to accurately as possible, and you may see the setting already changed from 0 because of this.

Samyang Syiols Lens Station For Sony Fe Auto Focus Lenses

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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¥11684

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Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎥 Elevate your lens game — precision, power, and control in one sleek station!

PLUG PLAY USB CONVENIENCE - Connect quickly to your computer and manage lens settings with the intuitive Samyang Lens Manager software.
ACHIEVE RAZOR SHARP PRECISION - Calibrate focus parameters to capture every detail with professional-grade accuracy and consistency.
CREATIVE CONTROL AT YOUR FINGERTIPS - Customize aperture settings for perfect exposure and artistic flexibility in any lighting scenario.
STAY CUTTING EDGE WITH FIRMWARE UPDATES - Keep your Samyang AF lenses future-proof and performing at their peak with hassle-free firmware upgrades.
ENGINEERED EXCLUSIVELY FOR SAMYANG AF LENSES - Guaranteed compatibility and optimized performance for Sony FE mount lenses, ensuring your gear stays in top shape.

The Samyang SYIOLS Lens Station is a compact, durable device designed exclusively for Sony FE Samyang AF lenses. It enables professional photographers and videographers to update firmware, calibrate autofocus, and customize aperture settings via USB connection and free Samyang Lens Manager software. This essential tool ensures your lenses deliver sharp, reliable performance and creative flexibility, keeping your gear future-ready and perfectly tuned for every shoot.

Specifications

ASIN	B07N992NY1
Best Sellers Rank	#50 in SLR Camera Lenses
Brand	Samyang
Built-In Media	Instruction Manual, Lens Station, Lens Station IOLS-E, Sony E Mount Body Cap, USB Cable
Camera Lens	A device for updating lens firmware, calibrating and customizing focus and aperture parameters, compatible with Samyang AF lenses.
Camera Lens Description	A device for updating lens firmware, calibrating and customizing focus and aperture parameters, compatible with Samyang AF lenses. Camera Lens Description A device for updating lens firmware, calibrating and customizing focus and aperture parameters, compatible with Samyang AF lenses. See more
Color	Black
Compatible Camera Models	Sony A6100, Sony A6600, Sony A7 III, Sony A7R IV
Compatible Camera Mount	Sony E
Compatible Devices	Sony E
Compatible Mountings	Sony E
Customer Reviews	4.4 out of 5 stars 181 Reviews
Exposure Control Type	Automatic
File Format	.exe
Focal Length Description	12.0 - 135.0 mm
Focus Type	Auto Focus
Global Trade Identification Number	00084438765861
Image stabilization	No image stabilization
Item Highlight	Update firmware and fine-tune compatible autofocus lenses with easy USB connectivity and customization.
Item Weight	2.4 ounces
Lens	Standard
Lens Design	Prime
Lens Fixed Focal Length	12 millimeters
Lens Mount	Sony E
Lens Type	Standard
Manufacturer	Samyang
Manufacturer Part Number	SYIOLS-E
Maximum Aperture	1 f_stop
Maximum Focal Length	12 millimeters
Media Type	ProductImage, EnhancedContent
Minimum Aperture	22 f_stop
Minimum Focal Length	12 millimeters
Model Name	SYIOLS-E
Model Number	SYIOLS-E
Number of Items	1
Number of Packs	1
UPC	084438765861
Unit Count	1 Count
Video Capture Resolution	1920 x 1080
Warranty Description	Limited 1 Year Manufacturer
Water Resistance Level	Not Water Resistant
Zoom Ratio	1:1

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