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Thread: Adding UV/IR cut filter with nebula filter for visual obeservation??

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    Default Adding UV/IR cut filter with nebula filter for visual obeservation??



    A few years ago I remember seeing an article online, and obviously failed to bookmark or remember it. I only scanned it briefly with intentions to revisit, but, here I am not being able to find the info. I placed this the EP forum as I tend to think of filters as an integral part of the EP chain.

    But anyway: I am familiar with use of UV/IR types of filters in AP & general photo work, and realize that alone they offer virtually no discernable advantage to visual astronomy. But I remember this article speaking of adding a UV/IR filter in the light path in front of a nebula/oiii/etc filter to modify the light that is received/transmitted via the certain nebula filter by removing these bandwidths beforehand. I don't do any AP work so I don't have one to experiment with, but would such an addition/application offer any detectable difference in the view for visual use? What are your thought? Enquiring minds want to know.
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    Default Re: Adding UV/IR cut filter with nebula filter for visual obeservation??

    Did the article maybe mention astrophotgraphy with visuall filters?, visuall filters don't have ir/uv cut off so may require stacking a uv/ir with a filter of choice

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    Default Re: Adding UV/IR cut filter with nebula filter for visual obeservation??

    No, I do remember that it was specifically concerning visual observing. That's mainly what got me to thinking on this topic again was the fact that visual filters don't have these cut offs, so how would the view be effected if one were to introduce the cut off via adding the uv/ir filter into the chain.

    I know that the eye is not "visually" sensitive to these wavelengths, but would the bandpass of the nebula filter be sensitive/reactive to them?
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    Default Re: Adding UV/IR cut filter with nebula filter for visual obeservation??

    I wounder if it has to do with anything with using a fast scope maybe for refractors,might add some correction to ca ?
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    Default Re: Adding UV/IR cut filter with nebula filter for visual obeservation??

    I wish I could remember. I know the UV/IR cuts everything below 400nm and above 680nm, but I'm unsure if the removal of these wavelengths would show any visual benefit to the bandpass of certain nebula filters to the eye.
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    Default Re: Adding UV/IR cut filter with nebula filter for visual obeservation??

    I could see it being useful for imaging - like adding an IR Blocker to a Baader solar continuum filter - where the camera sensor responds to UV/IR that the eye doesn't but I can't think of a mechanism where it would make a difference to visual use.

    As far as I know, Narrowband interference filters aren't affected by whether there are other wavelengths of light present or not - it's the spacing of the filter layers that determines whether a particular wavelength gets blocked or not, and whether other wavelengths are present shouldn't affect that.

    Can't think of any biological reason why blocking wavelengths your eye can't see should make a difference either...
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    Default Re: Adding UV/IR cut filter with nebula filter for visual obeservation??

    That all makes perfect sense to me, and was kind of my thinking also. I just didn't know if there may be some 'invisible' element at play here.
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    Default Re: Adding UV/IR cut filter with nebula filter for visual obeservation??

    I remember seeing such an article, don't remember where either. I dismissed it as half truths encouraging the purchase of unnecessary gear.

    Here's the deal. The eye doesn't have a huge spectral response running from 380-800nm. Nebular filters are interference filters which will pass multiples of a basic wavelength. So only in the case of an interference filter passing something in the range 380-400 will there be a visual multiple in the range 760-800nm. So as long as the nebular filter is long of 400nm the eye itself serves as an excellent IR cut off. I don't know of any nebular filters in the range 380-400nm for which a cutoff other than the eye would be useful. It's certainly useless for any filter longward of 400nm.

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    Default Re: Adding UV/IR cut filter with nebula filter for visual obeservation??

    For example: A simple narrow band filter with a bandpass at 390nm would have a second transmission window at 780nm unless designed to suppress that wavelength multiple. A cheaply made filter would let the 780nm pass a good one would have a layer that would already cut that out. The eye already does an excellent job cutting out longer than 800nm so your H-beta filters are good to go as is.

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    Default Re: Adding UV/IR cut filter with nebula filter for visual obeservation??

    Thank you, sir! At least I know I wasn't imagining it since you were a witness to something similar also.

    But that basically confirms what my thoughts were trying to tell me, that those wavelengths were below perception and should have no visual effect on any 'apparatus' placed afterward.
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