Telrad fitting

[Sarge (Rod)]

I have a 12" SW Collapsible Dob and was looking at fitting a Telrad. The secondary mirror housing on my scope is 19 cm in length (between the white bans) while the length of the Telrad is listed as 21 cm, which means -it don't fit. Looking at photos of Telrads, the base appears shorter that the actual unit. If anyone has a Telrad, could they give me the measurements of the base, or if anyone with a 10" or 12" Collapsible SW dob and a Telrad, how is it mounted?

The Telrad web site and they give dimensions of the unit as:
Length 21.3 cm
Width 4.7 cm
Height 12.7 cm (mounted on base, no base measurements)
Weight 30 gm.

Thanks

Rod

[stephenb (Stephen)]

I have a base in front of me now...

Length: 17.2 cm
Width: 5.8 cm
Height: 18 cm (outside edge), 1 cm (centre)

FYI: The length of the unit quoted on their website at 21.3 cm is including the 3 collimation screws at the rear.

[mozzie (Peter)]

Originally Posted by Sarge

I have a 12" SW Collapsible Dob and was looking at fitting a Telrad. The secondary mirror housing on my scope is 19 cm in length (between the white bans) while the length of the Telrad is listed as 21 cm, which means -it don't fit. Looking at photos of Telrads, the base appears shorter that the actual unit. If anyone has a Telrad, could they give me the measurements of the base, or if anyone with a 10" or 12" Collapsible SW dob and a Telrad, how is it mounted?

The Telrad web site and they give dimensions of the unit as:
Length 21.3 cm
Width 4.7 cm
Height 12.7 cm (mounted on base, no base measurements)
Weight 30 gm.

Thanks

Rod

ive one on my 8" coll-dob i stuck it on with the d/sided tape supplied its a little longer but only bt 5mm not a prob then put 2 bolts through it to make shore the base sits up a little at the front but you have plenty of adjustment with the 3 screws at the back of the telrad to still align with scope
mozzie

[gb_astro]

Hi Rod.

Since you have room for the 17.2cm base you could use one of these risers to clear the ends of the UTA:

http://www.scopestuff.com/ss_tele.htm

or sold in Australia by:

http://www.telescopes-astronomy.com.au

Also makes it a bit easier to look through.

gb.

[Sarge (Rod)]

Thanks fellas, that's exactly what I wanted to know. Go to the right place, ask the question and you get the right answers.

Thanks

Rod