Piggyback mode in Alt/Az

[[1ponders]]

I've just read this comment "4) "Piggy-back" photography cannot be done in ALT/AZ mode."
at this site http://www.galaxyphoto.com/faq.txt and that was all that was said.

I've done a limited serch for clarification of this but without a lot of success. Can anyone here clarify this at all.

The context of the quote was in relation to a question about field de-rotators and the quote was for one of the disadvantages.

Does this apply when not using a field de-rotator

Signed Perplexed :P

[beren]

Paul interesting reading , i think even though the scope is driven fied rotation will effect the image , the other night i was trying the LPI on M42 in Alt/azi mode with combine/stacking and field rotation started after about 15-20 frames .

[[1ponders]]

Over what time were the frames collected Aragorn?

[beren]

Estimating about 3 min i think , frame capture was pretty rapid , maybe the software was compenstating as well.

[[1ponders]]

I must be doing something wrong.

Using LPI on saturn I only get about 40 or 50 images in about 10 minutes and they look like garbage. Just what I need another challenge :D:P Think I'll stick to ToUcam for planets and maybe try LPI for deep sky and try a comparison with 300D