Impact of bandshift when using narrow ha filters with night vision and fast optics

[GavStar]

In my observing session last night I took a few phone images of the area around Orion and Barnard’s Loop with my pvs-14 at 1x with my chroma 3nm ha filter. I thought it may be of interest to see just how significant the bandshift impact is with a 3nm filter at f1.2 - a lot!! But the contrast on the nebulae in the middle is amazing so that’s why I prefer to use a very narrowband filter despite the bandshift.

I also tried my chroma 5nm ha, but personally I preferred the 3nm views.

 

Edited January 9, 2022 by GavStar

[vlaiv]

I guess that really depends where you place filter?

There are several places in optical train that can fit it - and you should choose one that provides best angles (my bet would be before prime focus of telescope).

[GavStar]

3 minutes ago, vlaiv said:

I guess that really depends where you place filter?

There are several places in optical train that can fit it - and you should choose one that provides best angles (my bet would be before prime focus of telescope).

With the pvs-14 there is only one place you can put the filter since the front lens isn’t removable.

[vlaiv]

14 minutes ago, GavStar said:

With the pvs-14 there is only one place you can put the filter since the front lens isn’t removable.

What is exactly your setup?

Scope  -> EP -> PSV-14

Right?

Can you put filter onto EP?

[vlaiv]

Ah, ok, sorry

Yes - it says at x1 - so you were just using device.