skymax 127....max focal length lunar imaging

[nightfisher]

I have a very nice 127 skymax Maksutov, and i am wondering what would be the maximum focal length the Lunar image using a philips 900 webcam?

I have a 2.5 barlow and a 1.6 barlow head that could screw into the webcam nosepiece, on a stable mount would this be pushing things to far? 

[riklaunim]

For lunar imaging usually bit lower than max resolution is recommended to avoid image degradation caused by light diffraction (Moon has a lot of surface details and all those edges and high contrast features will have a "ghostly" shadow as a result of light diffraction).

So I would recommend imaging without any Barlows. I didn't used one with my SCTs. At very best seeing with a good camera more is possible (but that's usually a mono camera with infrared filters).

[nightfisher]

Rik, very precise and helpful answer, will stick to native focal length, or if seeing is good maybe use the x1.6

[Pompey Monkey]

Personally, I would try as many different focal lengths as I could.

Taking subs of the moon is very little effort compared to setting up the mount and scope and you will reinforce the received wisdom through direct experience