Baader Planetarium T-2 / 7.5mm/15mm/40mm Extension Tube (T-2 part #25A/25B/25C)
Baader Planetarium T-2 / 7.5mm/15mm/40mm Extension Tube (T-2 part #25A/25B/25C)
Focal Length
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Product Description
For over 30 years we have focused on the Astro T-2 thread system (M 42 x 0.75 mm); virtually every telescope manufacturer must offer this thread far ahead of the focal point of his instrument, such a universal T-ring (for DSLR cameras) can be connected.
The only exceptions are (still) Russian equipment, there the thread diameter is the same, but the pitch is still 1mm per revolution - rather than 0.75mm! Therefore, we offer among other things a "Russians adapter". At only 7mm additional optical length it can allow so many Russian lenses or telescopes to be compatible with an international Astro T-2 (M 42 x 0.75mm) connector!
For the sake of better recognition mostly are marked. See marking small 'a' or small 'i' in the respective indication! "a"; identifies an external thread (male); or, if Ø sign which a diameter, "i"; - a female is always (female) or - Ø character - an inner diameter.
Specifications
| MODEL | T-2 / 7.5mm Extension Tube |
T-2 / 15mm Extension Tube |
T-2 / 40mm Extension Tube |
| SKU (#) | 1508155 | 1508154 | 1508153 |
| EAN CODE | 4047825016201 | 4047825016218 | 4047825016225 |
| NET WEIGHT (G) | 15 | 25 | 45 |
| OPTICAL LENGTH (MM) | 7.5 | 15 | 40 |
| T-2 PART # | 25C | 25A | 25B |
| USAGE | For Eyepiece Projection with Sliding Focuser | ||
| INNER DIAMETER / CLEAR APERTURE (MM) | 38 | 38 | 38 |
| OUTER DIAMETER | 46 | 46 | 46 |
| INNER CONNECTION (LENS SIDED) | Thread, T-2 (M42 x 0.75) | ||
| OUTER CONNECTION (EYEPIECE/-CAMERA-SIDED) | Thread, T-2 (M42 x 0.75) | ||
| COMPATIBLE BRANDS | Astro T-2, Baader Planetarium | ||
| TYPE OF ADAPTER | Extension | Extension | Extension |
| FILTER SIZE | 7.5 mm | 15 mm | 40 mm |