2 replies to this topic

[Sol Robbins]

I'm considering getting the GSO 2 inch Barlow.

My question is whether or not this Barlow would vignette when using large diameter field stop diameter eyepieces such as one found on a 30 mm UFF?

Thanks.

[PKDfan]

I'm considering getting the GSO 2 inch Barlow.

My question is whether or not this Barlow would vignette when using large diameter field stop diameter eyepieces such as one found on a 30 mm UFF?

Thanks.

No Sol Robbins it won't at least for the 30UFF. I have the Olivon variant so googled FS sizes to see if it matches mine and so indeed you have just enough clear aperture to avoid a vignette with the 30UFF but a 40XW definitely would.

That Barlow has 37mm of clear aperture.


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[Sol Robbins]

Thanks very much for your reply.