Lens board/tool problem (?)

[cluttered]

I've recently bought a nice 150mm Rodenstock, which I now want to mount on a Chamonix (Linhof-style) lens board.

The lens in question is already mounted on a small lensboard, 8cm x 8cm. So I want to remove the lens from that lens board and mount it on my Chamonix lens board. But it looks like my lens tool is too wide for this task; it works fine on my other lenses and lens boards, but this particular small lens board has a raised ring on the back which is just a bit too narrow to allow me to get my lens tool into place. (See attached photo.)

The retaining ring is too tight to allow me to just use my fingers to remove it, and I can't get this lens tool into place because of the size. I've also tried to gently use a screwdriver in one of the retaining ring notches in order to loosen it, but it's too tightly attached for that. As far as I can see, my lens tool is pretty much the "usual" size, I can't see any for sale which are usefully narrower.

I can't see any other options, other than somehow grinding down that raised ring on the back of the lens board or to modify my lens tool to make it narrower. Given that I don't need this small lens board I'm leaning towards the first option.

Anyone got any better ideas? (Hopefully I've just missed something simple!)

[Keith Pitman]

It looks like you need an adjustable lens spanner wrench for this lens. Here's an inexpensive example:

http://www.ebay.com/itm/Pro-Spanner-...item4ae9b0cac2

[Bob Salomon]

The Rodenstock tool that you have fits all Copal and Compur and Prontor 0, 1 and 3 size shutters. Is your lens in something else?

[Jim Jones]

I've firmly held the lens board while engaging both slots in the retaining ring with two screwdrivers. It works much better than using only one screwdriver. I've also marred some retainers and lens boards, so be very careful.

[Michael Graves]

It looks like you need an adjustable lens spanner wrench for this lens. Here's an inexpensive example:

http://www.ebay.com/itm/Pro-Spanner-...item4ae9b0cac2

That one is decent for most lenses. I purchased the one on the site below, because the availability of both flat blades and pointed tips makes it far more versatile.

http://www.ebay.com/itm/DSLR-Camera-...item43d001266e

[Jon Shiu]

If there is no indexing pin sticking out the back of the shutter, you can often turn the shutter in front by hand to unscrew.

Jon

[Alan Gales]

The Rodenstock tool that you have fits all Copal and Compur and Prontor 0, 1 and 3 size shutters. Is your lens in something else?

Bob, I think the OP is saying that his tool fits the retaining ring but he can't get it in position due to the design of the back of the lens board. The diameter of the raised circle is too small to allow the Rodenstock tool to fit.


You could take a screwdriver and fit it in one of the retaining ring slots and gently tap the end of your screwdriver with a hammer. That will loosen it.

[Bob Salomon]

make sure that the correct end of the tool is being used.

[hoffner]

That one is decent for most lenses. I purchased the one on the site below, because the availability of both flat blades and pointed tips makes it far more versatile.

http://www.ebay.com/itm/DSLR-Camera-...item43d001266e

Indeed, I can only concur with you. Such a tool is a must for a LF photographer even more than a dark cloth that is easily improvised in the field unlike this tool.

[Tin Can]

I see a lot of rear glass damage, which I think is from tool slippage. I see slip jitter scratches on the ring when the tool jumps out.

Be real careful using these tools and make sure you are sitting down in good light and have a film grip on a fully tightened tool.

Some may want to wear one glove and work on a soft pad.

I fully open the aperture and set the shutter to T and keep it open, just in case of a slip which could poke a hole in shutter leaves. Makes for a bad day...

Always first try Jon's suggestion, it may unscrew by bare hand.