Barlow Powermate optical comparison

[Merlin66]

Hope someone can help me.....

Earlier this year (?) there was a post discussing the optical properties of the telecentric barlow/ powermate.

This had a neat gif and diagrams of the optical paths and how these extenders worked.

Can anyone remember this post and provide a link???

(Tried searching with no success)

Thanks,

 

[vlaiv]

Could this help?

 

[Merlin66]

Vlaiv,

Many thanks!!!

That's the one I had in mind.

Now bookmarked.....