1300mm

Quickly tried the Pentax Kr today with the Meade ETX-90 (FL=130mm) - handheld :D

And with lots of Solar Spots, also the Baader Solar Film. 

The Pentax Kr + f/13 of the ETX is a very good combo.

 Full sensor frame @ 1300mm

 

Crop of the first image

 

  

'Lola' (grandma) @ 50mm

 

  

Then 'Lola' @ 1300mm

Notes on the paper already readable :D