Charlie Krebs lives near me, and he brought over his Mitutoyo 5X and 10X. While there are a few slight differences the conclusion is the same as for mine - some degradation in the corners, while the center is fine.
So it seems that the 7.5X and 20X are different than the 5X and 10X
Tube Lens tests - medium format and full frame
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- PhotogrAzure
- Posts: 14
- Joined: Fri Jun 04, 2021 2:23 am
- Location: Southampton UK; Suzhou China
Re:
Hi Nathanm,nathanm wrote: ↑Fri Oct 28, 2016 11:53 pmHere is a photo of the 5X Mitutoyo mounted on the Raynox DCR-5320 pair.
They take 72mm filter mount, so we made an adapter that threads to 72mm, it is concave just enough to put the end of the objective about 1 mm in front of the front element of the DCR 5320 pair.
We made this after the optical bench tests.
The DCR 5320 is threaded into a 72-77 mm step down adapter, with the 77 mm end threaded into Thorlabs SM3 tube.
I really like the concave adapter design idea! I am wondering if you could share the 3D model, I'd like to machine one myself.
Re: Tube Lens tests - medium format and full frame
Nathanm sadly has not been posting much these days (none since 2017). I miss his posts. Perhaps he will answer, but if not, I would like to suggest a work-around. When I have this situation, I use multiple step-down rings, some mounted INSIDE the outer ones. This can bring an objective as close as you want to the front element of the tube lens, with no machining needed.
- PhotogrAzure
- Posts: 14
- Joined: Fri Jun 04, 2021 2:23 am
- Location: Southampton UK; Suzhou China
Re: Tube Lens tests - medium format and full frame
Thanks Lou! That sounds like a brilliant idea. Will try experiment this.Lou Jost wrote: ↑Thu Jun 10, 2021 6:22 amNathanm sadly has not been posting much these days (none since 2017). I miss his posts. Perhaps he will answer, but if not, I would like to suggest a work-around. When I have this situation, I use multiple step-down rings, some mounted INSIDE the outer ones. This can bring an objective as close as you want to the front element of the tube lens, with no machining needed.