Have a short 8" f 4.5 newt with a 1.8" ma diagonal. Love the portability of it. However, my long, unwieldy 5.5" f/12 ( 0.75" diag)newt beats it on hi power planet images. Would a 31mm triplet 2x barlow (used in Mead barlow), placed just in front of a 1.2" diagonal, improve the hi power planetary view of the 8"? Before I get on with fabricating the modifications to the spider, getting a slightly longer tube, drilling holes, etc., I would like to have some advice from others who have tried this approach. Does this type of arrangement have difficult collimation problems? Are the images comparable to those of,say, an 8" f/12 newt with a 1.2" diag?
The venerable "Sam Brown's All about Telescopes" does have some diagrams and math hints on placement of a barlow between the primary and secondary. That is all I have to go on presently.
The venerable "Sam Brown's All about Telescopes" does have some diagrams and math hints on placement of a barlow between the primary and secondary. That is all I have to go on presently.
