What Does A Uv Filter Do

By | 15/10/2022


#1

Posted
eleven October 2019 – xi:20 AM

Hi
:)
I saw really astonishing picture if andromeda with only uv/ir cut filter used. It was Trevor Jones image. what does uv ir cut filter do? Is it lightpollution filter? Does information technology produce natural colours on stars and nebulas and galaxies?
:D
I have modified (total spectrum) dslr camera Catechism 1100d.

I live in bortle grade five area.

Edited past AstroPepe, 11 Oct 2019 – xi:23 AM.

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#2



Jim Davis

Posted
11 Oct 2019 – 11:44 AM

It allows visible calorie-free through, and blocks all UV and IR light. It has nothing to practice with light pollution. Astrophotography cameras are sensitive to these wavelengths, but refactors practise not focus them properly.This filter prevents problems by cutting off calorie-free from outside the visual spectrum.

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#3



AstroPepe

Posted
eleven Oct 2019 – 11:58 AM

Ok thank yous
:)
Should i utilise it in bortle 5 class or is it too mich light pollution?

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#four



MikeECha

Posted
eleven October 2019 – 05:11 PM

Hi

smile.gif

I saw really astonishing picture if andromeda with only uv/ir cutting filter used. It was Trevor Jones epitome. what does uv ir cut filter do? Is it lightpollution filter? Does it produce natural colours on stars and nebulas and galaxies?

laugh.gif

I have modified (full spectrum) dslr photographic camera Canon 1100d.

I alive in bortle class v area.

With your full modern dslr, UV/IR cut capability is a must-have when imaging with a refractor as you lot do not have any unfocused UV or IR protection and the stars will be very large (bloated). Andromeda is a broad band target then it is best imaged with only UV/IR cut filtering. Filters with LP cutting features (like a CLS-CCD) will remove some colors from the galaxy.


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#five



AstroPepe

Posted
12 October 2019 – 03:34 AM

With your full mod dslr, UV/IR cut capability is a must-have when imaging with a refractor as you do not accept any unfocused UV or IR protection and the stars volition be very big (bloated). Andromeda is a wide band target and then it is best imaged with only UV/IR cut filtering. Filters with LP cutting features (like a CLS-CCD) will remove some colors from the galaxy.

Cheers
:)
i accept the cls ccd filter and it includes the uv ir cut. I will buy the uv ir cutting filter but can i utilise it but (no lightpollution filters) in bortle 5 area. Is there as well much light pollution if i do not utilise any light pollution filters

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#6



Samir Kharusi

Posted
12 October 2019 – 11:27 AM


118161521.jpg

If y’all do not use a UV/IR cutting filter in a full spectrum modded photographic camera you besides become a LOT of IR to the right in the in a higher place spectra. To see how diverse low-cal pollution filters interact with common calorie-free pollution just click here.

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#7



MikeECha

Posted
12 Oct 2019 – 11:29 AM

Cheers

smile.gif

i take the cls ccd filter and it includes the uv ir cut. I will buy the uv ir cut filter but can i use it but (no lightpollution filters) in bortle 5 area. Is there as well much low-cal pollution if i do non use any light pollution filters

I am somewhat a beginner APr too (non an good) merely this ane is explianed by science.

Hither is the consequence. LP is still light that is nearly in the eye third portion of the visible spectrum. You but practise not want that light that is human being made in your image. But broadband targets similar stars, galaxies and reflection nebulae have colors in the aforementioned portion of the spectrum. Cutting out LP with CLS/LPS filter will cut out some colors on your broadband target.

So yes, for these targets you are improve off with a UV/IR cut filter only in any LP surface area. You lot would deal with LP past taking shorter exposures (a lot of them) to reduce the impact of LP and increment the indicate to dissonance ratio.

Edited by MikeECha, 12 Oct 2019 – 11:30 AM.


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#8



Charlie B

Posted
12 October 2019 – 02:17 PM

Hi

smile.gif

I saw really amazing picture if andromeda with only uv/ir cutting filter used. Information technology was Trevor Jones image. what does uv ir cut filter do? Is it lightpollution filter?

As others have noted, it cuts out the UV and IR spectra.  Your optics cannot see this, but the camera’south chip tin can.  It is non a light pollution filter.

Does information technology produce natural colours on stars and nebulas and galaxies?

laugh.gif

I presume that what y’all are calling natural colors are what the middle would see.  You removed that when the photographic camera was modified.  A typical modification removes an eye response filter and replaces it with plain glass.  A total-spectrum modification removes both the center-response and the congenital-in uv-ir filter and replace them with drinking glass.  Yous need to set a white residual for your modified photographic camera (or process the colour balance) to produce an equivalent center response.  Otherwise, the image will accept a green tint.

I have modified (full spectrum) dslr camera Canon 1100d.

Full spectrum needs a UV-IR cut filter for wideband (e.g., galaxy) imaging.

I alive in bortle class 5 expanse.

Regards,

Charlie B


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#nine



AstroPepe

Posted
12 Oct 2019 – 04:44 PM

Thank you all
:)
i am now much wiser. I was thinking should i use only uv/ir cutting filter in my lawn bortle five or exercise i really need to utilise light pollution filter similar cls ccd which i have right now. Bortle 5 form is like middle of city heaven and dark sky

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#10



freiform

Posted
13 October 2019 – 01:37 AM

Hi Samir, something is off with the image you posted or essential description is missing. Same filters prove different bands and e.g. the Baader 7nm doesn’t let pass Ha at all?


118161521.jpg

If you lot practise not utilise a UV/IR cutting filter in a full spectrum modded camera you also get a LOT of IR to the right in the above spectra. To see how various calorie-free pollution filters interact with common light pollution just click hither.

Sven

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#11



Samir Kharusi

Posted
sixteen October 2019 – eleven:28 AM

Hello Samir, something is off with the paradigm y’all posted or essential description is missing. Same filters testify different bands and e.g. the Baader 7nm doesn’t let pass Ha at all?

Sven

You demand to cheque the page itself for the caption. There are two sets of spectra displayed to a higher place, one using a tungsten lamp (information technology has Ha and the Baader 7nm Ha filter passes information technology) and the bottom fix uses an energy-saver lamp that has no Ha, hence the next spectrum with the Baader 7nm Ha does not show Ha. The ideal narrow ring filter for amateur DSLR use on nebulae would pass simply Ha and OIII and block everything else, now finally available…


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#12



freiform

Posted
16 October 2019 – 03:57 PM

Ah, different sources. Thank you.

Sven

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Source: https://www.cloudynights.com/topic/679762-what-does-uvir-cut-filter-do/