Fitting New Glass to a Fotoman 6×17 Lens Cone: Part One

February 26th, 2025 | it's about gear

FOTOMAN 6x17 + NIKKOR SW 90 f/4.5

What if you own a Fotoman panoramic film camera and need to replace the lens? A decade ago, you could have contacted Fotoman Camera directly to order the necessary cone, helical focusing mount, spacers, and screws–or even sent in your lens for a complete installation. Unfortunately, that’s no longer an option. The original Fotoman Camera has been defunct for years, and any entity operating under a similar name today is not the same company. While Fotoman parts occasionally appear on auction sites, they are rare, and availability is unreliable.

Fotman cameras are exceptionally well-built and straightforward, capable of lasting a lifetime with proper care. I once purchased a new 6×17 panoramic camera from a different brand, hoping for a similar experience, but ultimately returned it due to its inferior build quality compared to the Fotoman 6×17. Years ago, I sold my original Fotoman 6×17 with two lenses–a decision I came to regret. I promised myself that once I retired and had more time to shoot 6×17 film panoramas, a format I deeply enjoy, I would find another.

In late 2023, I came across a used Fotoman 6×17 in excellent condition, already set up for a 90mm lens—the exact configuration I wanted. It came with a Fujinon SW 90mm f/8, a sharp lens, but its narrow maximum aperture made focusing on the ground glass more challenging than I prefer. Fortunately, I already had a Nikkor SW 90mm f/4.5, which better suites my needs. In this article, I’ll walk through the process of swapping the lenses, and in part two, I’ll cover the calibration process and share test images taken with the Nikkor on the Fotoman.

The Steps Outlined Below:
1. Lens Options
2. Remove Existing Lens
3. Compare Old & New Lens Sizes
4. Install New Lens
5. Infinity Focus

1. Lens Options for Fotoman 6×17

Fotoman cameras use lens cones and helical focusing mounts, requiring the lens to be compatible with the cone for proper mounting. For a reference on which lenses are compatible with Fotoman lens cones, check out the chart below that Fotoman published years ago for their 6×17 cameras. The Nikkor SW 90 f/4.5 is at the top of the list, and I have the Fotoman spanner wrench for Copal 0 and 1 lenses, as shown in the graphic below.
FOTOMAN 6x17 LENS CHART

[ Usable Lens Chart for FOTOMAN 6×17 Cameras ]

I’ve had the Nikkor SW 90mm f/4.5 in my cabinet for a few years, intending to pair it with a Fotoman 6×17. It’s an excellent lens, and I’ve enjoyed using it with my Ebony RSW. However, for my 4×5 kit, the more compact Nikkor SW 90mm f/8 is a better fit. It helps reduce bulk and weight when carrying my 4×5 setup into the field, and since I can use my viewing bellows on the Ebony, focusing with the f/8 lens hasn’t been an issue.

2. Remove Fujinon Lens

My next step was to remove the Fujinon lens from the lens cone, which initially seemed challenging since I didn’t have the specialized Fotoman lens wrench for Seiko shutter lenses—or possibly one designed for the Fotoman rear lens retaining ring (referenced on page 2 of the Fotoman manual). While I’m familiar with swapping lenses on boards, this retaining ring wasn’t a standard Copal or Compur; it could have been a Seiko or the proprietary Fotoman design mentioned in the manual. I couldn’t be sure, as the camera and lens combo had been configured long before I acquired it.

My original Fotoman two-lens kit included Rodenstock 90mm and 180mm lenses in Copal shutters, so I had no prior experience with Seiko or proprietary Fotoman retaining rings. Fortunately, I have a lens spanner wrench (similar to this), and with some careful finessing, I managed to remove the lens without issue. However, the tool I used wasn’t designed explicitly for a Seiko or Fotoman retaining ring, so if you opt for a similar approach, proceed with caution.

The biggest challenge was the length and narrowing of the cone, which made loosening the tightened ring particularly difficult. But with patience and persistence, I was eventually able to remove it.

3. Compare Lens Sizes

COMPARING FUJINON SW 90 f/8 & NIKKOR SW 90 f/4.5 LENS SIZES
Fotoman cameras use lens cones and spacers to adjust the distance between the camera body and the lens, making lens size a critical factor. The camera originally came with a Fujinon SW 90mm f/8 installed in the lens cone with a single spacer behind it. The Nikkor SW 90mm f/4.5, however, is both wider and longer than the Fujinon, which is an important consideration.

Think of the lens cone and spacers like bellows extension—lens length affects the amount of extension needed to achieve infinity focus. Once the Nikkor SW 90mm f/4.5 is installed, I’ll need to check the ground glass to determine whether infinity focus can be achieved with or without the spacer.

4. Install Nikkor Lens

Installing the Nikkor SW 90mm f/4.5 wasn’t difficult, though it was a tight fit. Using the Fotoman spanner wrench made tightening the rear lens retaining ring much easier. Once the lens was secured, with the focusing ring set to infinity on the top viewing area, I reinstalled the spacer on the camera body, followed by the lens cone. With everything reassembled, I mounted the camera on a tripod and checked the ground glass. As expected, infinity focus wasn’t achieved—the Nikkor SW 90mm f/4.5 is longer than the Fujinon SW 90mm f/8, requiring adjustments. To compensate, I removed the spacer to bring the lens closer to the film plane, but this led to an unexpected issue—the original lens cone screws no longer fit, as they were designed for use with the spacer. Now, before I can proceed with calibration, I need to order new screws.

5. New Screws & Infinity Focus Achieved

To find the correct screws for securing the Fotoman lens cone to the camera body, I used a Screw Thread Gauge (both Metric and SAE). The original Fotoman screws are nylon and match the M5 thread size. Since I wasn’t sure of the exact length needed, I ordered a small kit of M5 nylon screws ranging from 8mm to 30mm. After testing, the M5 x 25mm screws turned out to be the best fit. These replacements require a Phillips head screwdriver, which wouldn’t be ideal for frequent lens swaps—but since I don’t plan on changing lenses, it’s not an issue.

If I ever decide to expand my 6×17 film photography to multiple lenses, I’d likely invest in a 6×17 field camera like the Shen Hao. However, for now, I prefer sticking to a single lens, and the Fotoman remains my ideal choice, as it aligns with my preference for simplicity.

With enough research, I’m sure replacement screws with a knob-style head—similar to the originals—could be found, but I don’t need them. I’ve bagged and stored the spacer and original screws for now. I may eventually sell them if someone else can make use of them, but at the moment, I’m simply enjoying having the lens I want on my Fotoman 6×17.

With the lens cone securely reattached without the spacer, I checked the ground glass and confirmed that infinity focus was once again achieved!

In part two, I’ll walk through the process of calibrating the lens scale for hyperfocal distance focusing and share images made with the newly installed Nikkor lens.

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