How to add light pollution filter to Esprit optical train

[AbsolutelyN]

Hi

I have a 2" Optolong LPro light pollution filter which I was using with my DSLR and am unsure how to go about adding it to the optical train of the Esprit 100 + zwo camera.
Current config has flattener, zwo spacers, filter wheel + zwo 1600mm. I don't think there is a 2" thread. 

A few queries:
Does a mono camera actually need a light pollution filter? I just have it already so interested to know if it is any use or not.
If I managed to get it into the optical train will it push the focus point further back so you need more spacing? I noticed with DSLR lenses it significantly shifted the focus point.

Many thanks

 

[red dwalf]

if you are doing narrowband imaging then really no point in using a light pollution filter, i also found on my setup that i would get a funny reflection showing up on the image when using one

 

[AbsolutelyN]

Currently only have HA 7nm. Understand no use for narrowband, more is it of use for LRGB. Also with the 1600 are you better with shorter subs that trying to push longer exposures which a LP filter would require.

[steppenwolf]

53 minutes ago, AbsolutelyN said:

Does a mono camera actually need a light pollution filter?

An LP filter will work for LRGB imaging with a mono camera but you do need to be sure that you don't get all sorts of unwanted reflections between the various filter surfaces.

55 minutes ago, AbsolutelyN said:

If I managed to get it into the optical train will it push the focus point further back so you need more spacing?

You will need more spacing between the flattener and the sensor.