Tal 1 Solar projection

[NorthantsTalMan]

Hi All,

I have a later version of the Tal 1 reflector, and wish to do solar projection on the supplied screen. I notice that the earlier versions have a spare top tube cap with an offset hole in it (not now supplied by tal), what size is the Hole and what is the offset from centre or edge of

cap?. I will probably have to make one!

Do I need to use baader film over the hole or is this unneccesary for projection.

Any help much appreciated

Andy:)

[AndyH]

Hi Andy.

The offset hole has a diameter of 44.5mm(1 3/4") and it's centre is 42.25mm(1 5/8") from the centre of the full cap.

Solar film is needed for direct viewing only. The Tal screen is meant for direct focused sunlight on to it.

Andy.

[NorthantsTalMan]

Thanks for info Andy - most useful !

Apparently on the 5/6 June Venus is in transit of the Sun so I want to get some practice in before hand. I may try to photograph the projected image

Andy