H-B Adapter (for Pentax Spotmatic / Spotmatic 2)

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For use with the Pentax Spotmatic (Spotmatic 2), the solution for the discontinued H-B mercury battery. Reusable adapter, simply change the batteries.

Use Batteries: Silver Oxide SR626W (Equivalent: SR626SW, 376, 377)

The adapter replaces the battery cover, and it has a built in circuit to reduce the voltage of SR626W battery 1.55V to that of a mercury battery approximately 1.35V.
*Only use the silver oxide batteries. Alkaline batteries give poor results.

Suitable Models: For Pentax Spotmatic (SP) and Spotmatic 2 (SP2) only.
*No additional modification is required with some exceptions.

Click here to find the suitable adapter you need.

Note :
●Battery is not included.
●Unsuitable for Large Currant

Please read and understand the following before ordering

●Some models may have unexpected limitations. Take test shots with the adapter before actual shooting. Please note that we are not responsible for any issues that arise from using the adapter while shooting.

●Old products may have poor contact due to weak spring or erosion on battery contact. Please also note that there is a possibility of short circuit depending on the shape of the battery contacts.

●Some models require a contact in the battery chamber to be modified in order to use a battery adapter. Please check the list of the suitable adapters.

●Even if you use a suitable adapter and battery, the adapter may not work if the camera or light meter is defective. Please note that we do not accept returns.

●The voltage of silver batteries (SR) hardly changes with the remaining battery charge, while the voltage of alkaline batteries (LR) decreases as the remaining battery charge becomes low. Alkaline batteries are not suitable for use in models with a match-needle light meter. Alkaline batteries are prone to leakage, so be sure to remove them when the camera or light meter is not in use.

●In order to reduce the voltage with the adapter, it needs to be installed with a battery in a camera or a light meter, and a current has to flow. Just measuring with a digital tester cannot get the reduction. 

●The voltage conversion value is based on measurements at ordinary temperature and under normal shooting conditions.