Barlow for lunar photography?

I would suggest a 3x for your FOV that would give you multiple close-up images of different regions and bring in more surface detail. You could always take it off for a full disc shot.  -Eddie

andrea tasselli:

Light blue = 1600mm (1000mm 1.6x crop from FF) No barlow

Note sure if I read it correctly but your focal length has got nothing to do with the FOV crop factor of an APS-C camera.

I know, but I thought 1000mm cropped to APS-C will look  like 1600mm with Full-Frame?

Ok, what goes between my M48 T-ring and the 2" Barlow? A 2" Nosepiece with m48 threads?

It's a mystery to me why they called it a nosepiece (why nose?). But it seems that that's what I need, and I think it's the most essential thing I need.  https://agenaastro.com/parts-accessories/adapters/nosepieces/shopby/2_nosepiece.html

andrea tasselli:
Not sure I follow you here. You want a 2" nosepiece for doing what, exactly? If it is to mount the camera on the scope, yes any of those will do. If it is for the barlow, that should come with its own nosepiece.

Yes, I want to use a nosepiece for connecting the camera to the focuser itself or the Barlow.

Incidentally, your best bet is a coma-correcting one if you are using an APS-C sized sensor.

I will use APS-C, so where can I find a coma correcting barlow?

andrea tasselli:
You need one with M48 thread rather than one with 2" clamp to attach the camera to the scope but most likely you'd need a coma corrector in between, even at f/5.

As for the coma correcting barlow lens, one possibility is this:
APM 1.25" 2.7x Coma-Correcting ED Barlow # APM-Komakorr-Barlow (agenaastro.com)
Or this, if your pockets are deep enough:
APM Telescopes. APM 2 inch coma-correcting telecentric 1.5x Barlow (apm-telescopes.net)

 Okay. Will it work if I get a CC and Barlow separately and put them together?

Would this work for you. 2" Barlow

https://www.astro-physics.com/baradv

andrea tasselli:

Okay. Will it work if I get a CC and Barlow separately and put them together?

Most likely no. Maybe with a Paracorr type II and a very short barlow but it is a very outside chance. And I don't know of any 2" "shorty" barlow. Never mind that the cost would probably exceed the value of the scope...

Ok, I'll use a 2x Barlow and take pictures of halves (or quarters depending on the amount of coma or vignetting) of the Moon and just merge them in a panorama in PS. When I move to astronomy cameras I'll take more segments of the Moon and merge them together.

I also found some examples of Astrophotos taken with my scope here. here also, but with an astronomy camera.


Thanks.

Oh, one more question: you were saying that I would need m48 threads rather than a 2" clamp on the Barlow, can you clarify what you meant? I don't want my camera to fall off the focuser of course.

If you plan to attach the camera directly to the barlow than a 2" nosepiece with the t-thread adaptor will do. If it is to attach the camera to a coma corrector than a t-thread adaptor will do.