32mm Tele Vue Field Stop Mod
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A smaller field stop for the 32mm Tele Vue Plossl that may improve its sharpness and eye positioning characteristics.
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- Creative Commons — Attribution — Noncommercial
The 32mm Tele Vue Plossl has a field stop that is about as wide as can be fit in a 1.25" barrel. I found that the position of the field stop renders it blurry for my vision (-4.5 spherical error in observing eye).
Additionally, it seems to compete with other internal rings or the bottom of the barrel, which can actually make it harder to feel like you've got the right eye position.
This field stop inserts into the eyepiece from the bottom of the barrel and threads into the filter threads of the eyepiece. It does not require dismantling of the eyepiece. It bypasses the stock field stop and creates a new one further up in the body. For my nearsightedness, this produces a narrower, but sharp field stop.
I found that both being narrower and sharper actually aids in eye positioning even without an eye guard extender.
Note that using this means you will likely lose the filter threads necessary to screw 1.25" filters into the eyepiece. For me this is not an issue since I attach 2" filters to an adapter first, but if you have 1.25" filters, this mod may stop you from using them.
There are no spanner notches so as to keep the continuity of the the fine threads. May require a bit of finagling to get it thread nicely into the eyepiece. A diy spanner wrench made of two nails or needles that you can push into the bottom of the plastic may help you turn it. I was able to turn mine with my fingers.
Adjustments
Again, this was designed for my uncorrected nearsightedness (-4.5 in observing eye). This will make the field stop blurry if you wear glasses when looking through it. You may have to split the body at the shoulder and scale the angled field stop portion up or down to get the desired position where it is sharp for your vision. Don't scale up below the shoulder because then the stock field stop in the barrel will interfere with it.
Print Recommendations
I printed mine with basic PLA through Bambu Studio on my X1C.
The threads are quite fine and I recommend a maximum of a 0.4mm nozzle and 0.12mm layer height.
Print thread-side down.