Adapter 3.3"i to M68a

Product Details

SKU
2458216
EAN Code
4047825036254
Manufacturer
Baader Planetarium

Optical & Usage Specifications

Adapters Family
M68 System
Optical length (mm)
24 (effective)
Type of Adapter
Reducing Adapter

Ports & Compatibility

Compatible Brands
Baader Planetarium
Celestron
Meade
Zeiss
Inner Connection (lens sided)
3.3"/SCT Thread (84.2 mm)
Outer Connection (eyepiece/-camera-sided)
M68 x 1

Dimensions & Weight

Inner Diameter / Clear Aperture (mm)
58
Net weight (kg)
0.09
Outer Diameter
81,5

Customer Reviews

5.0

review

Tell us what you think about this item!

Top customer reviews

Tom Alderweireldt

2026-05-29 23:55:19

I recommend this product

Rating

00

Connecting a 3.3" SCT Starizona reducer to a C14 requires the Baader 3.3" to M68 converter

Unfortunately the Starizona reducers also has rear end 3.3" SCT thread, so using the Baader 3.3" to M68 converter was a very good solution for my setup to finally get the full optical train and full frame camera fully illuminated with a M68 connections. That resulted also in a stronger camera train, with less deflection or till than ever seen before.

SCT 3.3" thread connections are always a problem, so I like the simple and effective design of the Baader adapter ring, which opens the flexible way to adjust focal distance. with M68 established spacing rings.

No complaints, It's sturdy and qualitiy machined. without this Baader adapter my M68 overall camera connection wouldn't have worked.

Steve K / September 17, 20261 Answer

You can see the thread pitch (M68 x 1) at the specifications under "Ports & Compatibility". The M68 standard hat been established by Zeiss and improved / extended by us. For decades this existed only with 1mm pitch. Only recently a few new systems came to market by other brands who established an M68 x 0.75 pitch. This is not our standard and we only have made a Clicklock for it and a change ring to use our M68 system instead. So, if not otherwise mentioned, all of our parts are M68 x 1.
Baader Web Team / September 18, 2026
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Mauro / June 10, 20221 Answer

We have no idea why Meade changed their thread norm just a tiny bid when they copied Celestrons 3" thread. Celestron was first - but that had happened more than 40 years ago.. Also about 35 years ago we started to do accessories with that 3.3" size - and we saw that if we do create our own norm for the thread width - which is a tiny bit wider on the Celestron OTAs, then we could do one ring that will fit both telescope brands. So we do produce 3.3" threaded rings with our own "in-house-standard" - and it works on both brands.
Baader Web Team / June 14, 2022
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Service & Company

Service & Company

Adapter 3.3"i to M68a