Nikon Flash Couplers AS-1, AS-2, AS-3, AS-4, AS-5, AS-6, AS-7

NIKON FLASH UNIT COUPLERS

AS-1-2-3-4-5-6-7,10 & 11.

Nikon Flash Unit Couplers provide direct electrical connection between a Nikon camera body and an electronic flash unit when the mounting foot of the flash does not fit the camera's built-in accessory shoe. The flash then can be used without a sync cord. Six types of Flash Unit Couplers are available according to the type of camera and flash combination

Nikon Flash Couplers' Compatibility Graph

Flash Unit Coupler

Coupler

Camera

Electronic Flash Unit

Remarks

AS-1

Nikon F and F2 Series

Nikon Speedlight SB-15, SB-16B, SB-19, 20, SB-21B, SB-22, SB-23, SB-24, and other electronic flash unit with ISO-type mounting feet.

*1

AS-2

Nikon F5 and F4 (with DP-20, DA-20), F3P, F3H, F801, FA, FE2, FM2, FM2n, F-501, F401, F-301, and other cameras with ISO type hot shoes.

Nikon Speedlight SB-7, it permits flashes with F or F2 sockets to be used on F/F2 cameras with ISO hot shoe.

AS-3

Nikon F3 Series

It permits flash units designed for Nikon F and F2 to be used on Nikon F3. Examples, older BC- units or SB-7E etc.

AS-4

Nikon F3 Series

it connects flash WITHOUT a cable attachment functions but with a ISO-type hot shoe. Other newer units also usable Examples:- Nikon Speedlight SB-15, SB-16B, SB-19, SB-20, SB-21B, SB-22, SB-23, SB-24, and other electronic flash units with ISO-type mounting feet.

*1, *2

AS-5

Nikon F2 Series

It reverses the usage of Nikon flash designed for the Nikon F3 special flash foot to be used on older Nikon bodies such as Nikon F and Nikon F2 models. Nikon Speedlight SB-12, SB-16A, SB-17, SB-21A

*3

AS-6

Nikon F5 and F4 (with DP-20, DA-20), F3P, F3H, F801, FA, FE2, FM2, FM2n, F-501, F401, F-301, and other cameras with ISO type hot shoes.

It works in principle as the AS-7, where Nikon Speedlight SB-12, SB-16A, SB-17 or special unit such as SB-21A designed for the Nikon F3 to be used on Nikon bodies with a standard ISO-type hot shoe.

*3, *4

AS-7

Nikon F3 Series

This was specifically designed for Nikon F3, Where all ISO-type hot shoe Nikon flash can be mounted and used on the Nikon F3.

*5

AS-8

See Nikon SB-16 A/B

Nikon F3 Series

Basically the base module of the connecting part of the SB-16A, designed with a Nikon F3 flash foot.

AS-9

Nikon F5 and F4 (with DP-20, DA-20), F3P, F3H, F801, FA, FE2, FM2, FM2n, F-501, F401, F-301, and other cameras with ISO type hot shoes.

Basically the base module of the connecting part of the SB-16B, designed with a any Nikon SLR with an ISO-type hot shoe.

AS-10

The module has a direct connections for additional flash (off camera), it is used with sync cords such as SC-18 TTL multi-flash connecting cables. It has a tripod socket for independent use with a separate flash.

AS-11

AS-17

Nikon F3 Series

refer to this link

with other third party labels

Mounting Procedure

1. Turn the locking ring of the Flash Unit Coupler counterclockwise until it stops.
2. Insert the Coupler into the accessory shoe of the camera body until it stops. With the AS-1, AS-2, AS-5, and AS-6, push the Coupler into the accessory shoe from the rear. With the AS-3 and AS-4, insert the Coupler from the front.
3. Attach the Coupler to the camera body by turning the locking ring clockwise until it stops.
4. Then, attach the electronic flash to the Coupler's accessory shoe.

*1. Set the camera selector of SB-19 to "A". When a flash gun or a flash unit without hot shoe is used insulation material like vinyl tape must be used on the couple;'s contact to avoid short circuit
*2. When the F3 is used with the SB-15, SB-16B, SB-19, SB-20, SB21B, SB-22, SB-23, SB-24, SB-11+SC-13, SB-14+SC-13 or SB140+SC-13, the shutter speed is automatically switched to the proper synchronization speed as soon as the speedlight unit is turned on. (The shutter speed is switched to 1/80 sec. When the shutter speed dial is set to A or 1/2000 - 1/125 sec. ). The ready light lights up when the flash is recycled and ready to fire.
Note: When the F3 is used with third party flash unit, the camera's electronic circuit could damage in the following cases:
*3 • Manual shooting only when using SB-12. Set the shooting mode selector of the SB-12 "M" for manual.
*4 • When the SB-12. the SB-16A, the SB-17 or the SB-21A is used with the F4 (with DP-20, DA-20), the F801, the FA, the FE-2 the F-501, the F-401, the F-301. the shutter speed is automatically turned to the proper synchronization speed as soon as the speed light unit is switched on.
*5 TTL is possible with SB-12, SB-16A, SB-17, others offers automatic and manual flash.

* Note: To use the F4 camera (with DW - 20 or DW - 21) with a speedlight flash unit, the SC 24 TTL light control cord is necessary.

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Recommended links to understand more technical details related to the Nikkor F-mount and production Serial Number:
http://rick_oleson.tripod.com/index-153.html by: my friend, Rick Oleson
http://www.zi.ku.dk/personal/lhhansen/photo/fmount.htm by: Hansen, Lars Holst
http://www.mir.com.my/rb/photography/hardwares/nikonfmount/lens2.htm
http://www.photosynthesis.co.nz/nikon/serialno.html

Recommended Reading Reference on Nikon cameras and Nikkor lenses
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Nikon Flash Couplers' Compatibility Graph
Flash Unit Coupler	Coupler	Camera	Electronic Flash Unit	Remarks
AS-1		Nikon F and F2 Series	Nikon Speedlight SB-15, SB-16B, SB-19, 20, SB-21B, SB-22, SB-23, SB-24, and other electronic flash unit with ISO-type mounting feet.	*1
AS-2		Nikon F5 and F4 (with DP-20, DA-20), F3P, F3H, F801, FA, FE2, FM2, FM2n, F-501, F401, F-301, and other cameras with ISO type hot shoes.	Nikon Speedlight SB-7, it permits flashes with F or F2 sockets to be used on F/F2 cameras with ISO hot shoe.
AS-3		Nikon F3 Series	It permits flash units designed for Nikon F and F2 to be used on Nikon F3. Examples, older BC- units or SB-7E etc.
AS-4		Nikon F3 Series	it connects flash WITHOUT a cable attachment functions but with a ISO-type hot shoe. Other newer units also usable Examples:- Nikon Speedlight SB-15, SB-16B, SB-19, SB-20, SB-21B, SB-22, SB-23, SB-24, and other electronic flash units with ISO-type mounting feet.	1, 2
AS-5		Nikon F2 Series	It reverses the usage of Nikon flash designed for the Nikon F3 special flash foot to be used on older Nikon bodies such as Nikon F and Nikon F2 models. Nikon Speedlight SB-12, SB-16A, SB-17, SB-21A	*3
AS-6		Nikon F5 and F4 (with DP-20, DA-20), F3P, F3H, F801, FA, FE2, FM2, FM2n, F-501, F401, F-301, and other cameras with ISO type hot shoes.	It works in principle as the AS-7, where Nikon Speedlight SB-12, SB-16A, SB-17 or special unit such as SB-21A designed for the Nikon F3 to be used on Nikon bodies with a standard ISO-type hot shoe.	3, 4
AS-7		Nikon F3 Series	This was specifically designed for Nikon F3, Where all ISO-type hot shoe Nikon flash can be mounted and used on the Nikon F3.	*5
AS-8	See Nikon SB-16 A/B	Nikon F3 Series	Basically the base module of the connecting part of the SB-16A, designed with a Nikon F3 flash foot.
AS-9	See Nikon SB-16 A/B	Nikon F5 and F4 (with DP-20, DA-20), F3P, F3H, F801, FA, FE2, FM2, FM2n, F-501, F401, F-301, and other cameras with ISO type hot shoes.	Basically the base module of the connecting part of the SB-16B, designed with a any Nikon SLR with an ISO-type hot shoe.
AS-10			The module has a direct connections for additional flash (off camera), it is used with sync cords such as SC-18 TTL multi-flash connecting cables. It has a tripod socket for independent use with a separate flash.
AS-11
AS-17		Nikon F3 Series	refer to this link	with other third party labels