Does it work with Nikon 7000 and 750

Yes. It should work the same in any Nikon show

does it provide a signal to the e-ttl contacts on a Canon D550 to fool it into just triggering the flash without trying to set time and light?

I'm sorry I can't answer this question as I have only used it on my Nikon D3100. I leave my camera setting on automatic and I bounce the light onto the subject. I would contact t Wein customer service directly with such a technical question.

Can this be used to protect my sony a7r3 and Nikon 810 from my speedatron d802d flash pack?

Personally i would be asking the speedatron manufacturers this question as i have no idea what the trigger voltage is, the Wein works ok on small hotshoe flashes that were typically made for older film camera flash units where high trigger voltage was much less of a problem , but these days cheap Chinese dedicated flash units work very well on modern digital cameras and the Wein may be slightly obsolete in 2020

I have a Sunpak Auto 36DX Thyristor flash and a 4000AF power zoom flash. I wish to use them with my Nikon D80 and D90. Will this gadget allow that?

It should let you use any older flash unit with todays Digital camera. You wont be able to use any of the cameras through the lens light evaluation abilities, but using this devise will allow the flash to go off without damaging the cameras synchronization contacts.

Products W990560 Sshshs Safe Sync Hot Shoe To Hot Shoe

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

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Description

⚡ Protect your gear, power your creativity — safely synced, always ready.

VINTAGE FLASH REVIVAL - Effortlessly use powerful legacy flashes with modern digital cameras—no need to upgrade your entire lighting setup.
VERSATILE SYNC OPTIONS - Features a PC sync port for flexible off-camera flash setups, perfect for creative professionals pushing boundaries.
ULTIMATE VOLTAGE SAFETY - Safely reduces flash sync voltage from up to 400V down to under 6V, shielding your expensive digital camera from damage.
ROBUST LIGHTWEIGHT DESIGN - Crafted with strong yet lightweight materials for reliable, long-lasting protection without adding bulk.
SEAMLESS HOT SHOE INTEGRATION - Mounts directly on your camera’s hot shoe with a secure grip and includes a flash test button for instant reliability checks.

The Wein W990560 Safe-Sync Hot Shoe Adapter is a must-have for photographers who want to protect their digital cameras from damaging high flash voltages. It reduces sync voltages from up to 400 volts to a safe level below 6 volts, enabling the use of vintage and studio flashes without risking costly repairs. Lightweight yet durable, it mounts securely on your camera’s hot shoe and includes a PC sync port for versatile flash setups. Trusted by pros, it extends the life of your classic flashes while safeguarding your modern gear.

Specifications

ASIN	B00009UU18
Best Sellers Rank	#568 in Camera Flash Shoe Mounts
Brand Name	Wein
Color	Black
Customer Reviews	4.2 4.2 out of 5 stars (74)
Global Trade Identification Number	00750062043155
Item Depth	5 inches
Item Dimensions	4.25 x 2.75 x 1.38 inches
Item Weight	1.6 ounces
Manufacturer	Wein
Manufacturer Part Number	W990560
Manufacturer Warranty Description	2 Year
Model Number	W990560
Mounting Type	Integrated Mount
UPC	750062043155 887569315086 887569303878

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