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Nikkormat FTN Diode Modification: Fixing Your Classic Camera

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The Nikon Nikkormat FTN: A Classic Camera with a Modern Twist

The Nikon Nikkormat FTN is a beloved classic camera that has been a staple for photographers for decades. Its sturdy build, reliable performance, and wide range of lenses make it a great choice for both film and digital photographers. However, one common issue that FTN owners face is a faulty light meter due to the original mercury battery being discontinued. This can make it difficult to get accurate exposures, especially in low-light conditions.

Fortunately, there's a simple modification you can make to your FTN to solve this problem. By installing a diode in the meter circuit, you can convert it to accept a 1.5-volt button battery, which is readily available. This modification is relatively easy to perform and can breathe new life into your classic camera.

Why Modify Your Nikkormat FTN?

Here are a few reasons why you might want to modify your Nikkormat FTN:

  • Fix a faulty light meter: The original mercury batteries used in the FTN are no longer available, leading to inaccurate light meter readings. This modification ensures your meter works accurately.
  • Extend the life of your camera: By using a readily available button battery, you can keep your FTN in working order for years to come.
  • Improve your photography: With a properly functioning light meter, you can take more accurate exposures, especially in challenging lighting conditions.

What You'll Need

To modify your Nikkormat FTN, you'll need the following:

  • A Nikon Nikkormat FTN camera
  • A 1.5-volt button battery (e.g., SR44 or LR44)
  • A diode (1N4001 or similar)
  • A small piece of wire (about 1 inch)
  • Soldering iron and solder
  • A small screwdriver
  • A multimeter (optional)

Step-by-Step Instructions

Follow these steps to modify your Nikkormat FTN:

  1. Remove the bottom plate: Use a small screwdriver to remove the screws holding the bottom plate of the camera in place. Gently lift the bottom plate off the camera body.
  2. Locate the meter circuit: Look for the light meter circuit board, which is typically located near the battery compartment. It will have a small metal plate with a spring and a contact point.
  3. Solder the diode: Carefully solder the diode to the meter circuit board. The diode's positive (+) lead should be connected to the contact point on the metal plate, while the negative (-) lead should be connected to the spring.
  4. Connect the wire: Cut a small piece of wire and solder one end to the negative (-) lead of the diode. Solder the other end of the wire to the negative (-) terminal of the battery compartment.
  5. Test the meter: With the diode and wire connected, install a new button battery in the compartment. Turn on the camera and check if the light meter is working. If the needle moves, the modification is successful. If not, check your connections and make sure the diode is properly installed.
  6. Reassemble the camera: Once you're satisfied with the results, carefully reassemble the camera by replacing the bottom plate and securing the screws.

Tips and Precautions

  • Use a multimeter: If you have a multimeter, use it to test the diode's polarity before soldering it. This will ensure you connect it correctly.
  • Be careful with soldering: Soldering can be dangerous if not done properly. Always wear safety glasses and take precautions to avoid burns.
  • Test the meter after installation: After completing the modification, test the meter to ensure it's working correctly. If not, troubleshoot the issue before using the camera.
  • Use a high-quality diode: A good quality diode will ensure the modification works reliably and does not affect the camera's performance.

Conclusion

Modifying your Nikon Nikkormat FTN to accept a button battery is a simple and effective way to fix a faulty light meter and extend the life of your camera. With a few basic tools and a little patience, you can bring your classic camera back to life and enjoy its timeless features for years to come. Remember to always work with caution and follow safety guidelines when working with electrical components. Happy shooting!

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