MN190 Focal Reducer?

[BlueAstra]

Do you mn190 owners use a focal reducer with your camera on this scope? If so, what is your FR&camera combination?

[adamsp123]

I don't.....

[Whippy]

I would have thought f5.3 is fast enough?

Tony..

[BlueAstra]

I guess I was thinking more in terms of aberration correction than F/N change, especially with large CCDs.

[MartinB]

The corrector plate is there to correct aberations. You don't want any additional correction on top of this. If using a focal reducer you would need to make sure it didn't also act as a flattener

[BlueAstra]

I think that's what I was looking for. So you don't need a FR/Corrector with an MN190 up to a DSLR size chip for aberration correction.

[adamsp123]

I think that's what I was looking for. So you don't need a FR/Corrector with an MN190 up to a DSLR size chip for aberration correction.

Correct... one of the reasons I went for this scope, no need for a load of glass layers to correct the light except for the front plate.

[BlueAstra]

Something else I just realised, you don't get diffraction spikes from the spider cos there isn't one, even though it looks like a Newtonian!