My 7-14 takes filters ... at the rear end

Najinsky wrote:

Anders W wrote:

...

Excellent job Anders and thanks for taking time for sharing. Just one thought about the shim.

You are welcome. See comment on your thoughts below.

Now let's look at the baffle-holder assembly from the back. As you can see, it does not leave room for the three wings in the same way as the baffle originally designed for the 7-14. There is an inner ring, that protrudes half a mm or so (upwards in this picture) from the broader platform surrounding it. This means that the baffle-holder assembly will land on the "wings" surrounding the rearmost element rather than on the mount when you try to put it in place. Consequently, you would put considerable tension on the plastic if you were to tighten the screws.

To resolve this problem, you need to insert a shim of some kind between the mount and the baffle-holder assembly. Ordinary washers are unlikely to work well for this purpose since the risk that they would fall down into the innards of the lens when mounting or dismounting the baffle-holder assembly would be extremely high. So I looked for another solution.

This would bug me a little, particularly the protruding into the body aspect. The inner ring looks primarily cosmetic but perhaps forms a basic protective seal too.

Not sure I understand here. Protective seal for what?

I would probably prefer to mill some cut-outs into the ring so it fits over the wings. A mounted Dremel would do the trick, or mark it up and pay $5 to a student at a local technical college if you don't have a Dremel.

From what you recall of the assembly, would this approach work and get rid of the extra protrusion?

I considered this option. I don't have a Dremel but know how it works and where to get one if I need one. However, I abstained on two grounds. First, the deviation from "intended fit" is really trifling and there is really nothing to worry about when it comes to touching things inside the body. Second, although it looks as though it would be possible to shave off that half mm from the inner ring without problem (as I think you can see based on the picture), I would still worry slightly about the integrity of the plastics after having done the operation.

One final point, you should consider copying and publishing this into DPR Article format. It would get more visibility and better site-wide indexing, and be easier to refer people to rather than a growing list of bookmarks to historic posts. I recall DPR also promised some type of brownie points for publishing articles but I've not seen anything further on that.

Thanks for the encouragement. The thought has occurred to me and perhaps I will manage to amass the energy and time at some point.

Thanks again for sharing

-Najinsky