IR Cut filters


Robert Chozick <rchozick@...>
 

They say the sensor on the ZWO ASI2600 has an IR Cut filter.  I took it to mean it is just IR and not UV also so I use the IR-UV filter.  I would like to know if anyone knows if an IR Cut filter is all you need with a refractor or if you also need the UV part.  My understanding is that you only need these filters with a refractor but if you use a catadioptric scope with a field flattener or tele-compressor that the glass elements of those additions also require it.  I would love to not use the extra filter.  My FSQ definitely needs a filter for bright stars.

Does anyone know the story here?

Robert

On Aug 2, 2020, at 6:24 PM, Andrew Arai <andrewarai@...> wrote:

Robert,

I have been thinking about getting a ZWO ASI2600.
Do you actually need a UV.IR filter to add potential reflections? I thought the glass cover for the camera provides UV/IR protection.

Andrew

Robert Chozick




Stuart <stuart.j.heggie@...>
 

Robert, not seeing any "informed" replies so I'll chime in with what little I know. The issue about UV filters for refractors vs. compound scopes would not apply to an AP refractor. My FSQn had terrible blue halos around bright (blue'ish) stars. The New-Q's apparently fixed that. This would NOT be an issue for an AP scope tho.

My vote is you do not need a UV filter.


On Sun, 2 Aug 2020 at 19:39, Robert Chozick via groups.io <rchozick=aol.com@groups.io> wrote:
They say the sensor on the ZWO ASI2600 has an IR Cut filter.  I took it to mean it is just IR and not UV also so I use the IR-UV filter.  I would like to know if anyone knows if an IR Cut filter is all you need with a refractor or if you also need the UV part.  My understanding is that you only need these filters with a refractor but if you use a catadioptric scope with a field flattener or tele-compressor that the glass elements of those additions also require it.  I would love to not use the extra filter.  My FSQ definitely needs a filter for bright stars.

Does anyone know the story here?

Robert

On Aug 2, 2020, at 6:24 PM, Andrew Arai <andrewarai@...> wrote:

Robert,

I have been thinking about getting a ZWO ASI2600.
Do you actually need a UV.IR filter to add potential reflections? I thought the glass cover for the camera provides UV/IR protection.

Andrew

Robert Chozick




--

Stuart
http://www.astrofoto.ca/stuartheggie/


Robert Chozick <rchozick@...>
 

I have the N fluorite version of the FSQ-106 so I guess that means I need the UV.  After looking at many different images with the N and newer version I want to keep my fluorite. 

Robert 


On Aug 2, 2020, at 7:30 PM, Stuart <stuart.j.heggie@...> wrote:


Robert, not seeing any "informed" replies so I'll chime in with what little I know. The issue about UV filters for refractors vs. compound scopes would not apply to an AP refractor. My FSQn had terrible blue halos around bright (blue'ish) stars. The New-Q's apparently fixed that. This would NOT be an issue for an AP scope tho.

My vote is you do not need a UV filter.


On Sun, 2 Aug 2020 at 19:39, Robert Chozick via groups.io <rchozick=aol.com@groups.io> wrote:
They say the sensor on the ZWO ASI2600 has an IR Cut filter.  I took it to mean it is just IR and not UV also so I use the IR-UV filter.  I would like to know if anyone knows if an IR Cut filter is all you need with a refractor or if you also need the UV part.  My understanding is that you only need these filters with a refractor but if you use a catadioptric scope with a field flattener or tele-compressor that the glass elements of those additions also require it.  I would love to not use the extra filter.  My FSQ definitely needs a filter for bright stars.

Does anyone know the story here?

Robert

On Aug 2, 2020, at 6:24 PM, Andrew Arai <andrewarai@...> wrote:

Robert,

I have been thinking about getting a ZWO ASI2600.
Do you actually need a UV.IR filter to add potential reflections? I thought the glass cover for the camera provides UV/IR protection.

Andrew

Robert Chozick




--

Stuart
http://www.astrofoto.ca/stuartheggie/


Dean Jacobsen
 

On Sun, Aug 2, 2020 at 06:01 PM, Robert Chozick wrote:
After looking at many different images with the N and newer version I want to keep my fluorite. 
Why?
 
--
Dean Jacobsen
http://astrophoto.net/wp/
Image Gallery - http://astrophoto.net/wp/image-gallery/
Astrobin - https://www.astrobin.com/users/deanjacobsen/ 


Stuart <stuart.j.heggie@...>
 

I miss mine. Traded it and cash for an AP130EDT. I came out okay. ;-)

Stuart

On Sun, Aug 2, 2020 at 9:01 PM Robert Chozick via groups.io <rchozick=aol.com@groups.io> wrote:
I have the N fluorite version of the FSQ-106 so I guess that means I need the UV.  After looking at many different images with the N and newer version I want to keep my fluorite. 

Robert 


On Aug 2, 2020, at 7:30 PM, Stuart <stuart.j.heggie@...> wrote:


Robert, not seeing any "informed" replies so I'll chime in with what little I know. The issue about UV filters for refractors vs. compound scopes would not apply to an AP refractor. My FSQn had terrible blue halos around bright (blue'ish) stars. The New-Q's apparently fixed that. This would NOT be an issue for an AP scope tho.

My vote is you do not need a UV filter.


On Sun, 2 Aug 2020 at 19:39, Robert Chozick via groups.io <rchozick=aol.com@groups.io> wrote:
They say the sensor on the ZWO ASI2600 has an IR Cut filter.  I took it to mean it is just IR and not UV also so I use the IR-UV filter.  I would like to know if anyone knows if an IR Cut filter is all you need with a refractor or if you also need the UV part.  My understanding is that you only need these filters with a refractor but if you use a catadioptric scope with a field flattener or tele-compressor that the glass elements of those additions also require it.  I would love to not use the extra filter.  My FSQ definitely needs a filter for bright stars.

Does anyone know the story here?

Robert

On Aug 2, 2020, at 6:24 PM, Andrew Arai <andrewarai@...> wrote:

Robert,

I have been thinking about getting a ZWO ASI2600.
Do you actually need a UV.IR filter to add potential reflections? I thought the glass cover for the camera provides UV/IR protection.

Andrew

Robert Chozick




--

Stuart
http://www.astrofoto.ca/stuartheggie/

--

--

Stuart
http://www.astrofoto.ca/stuartheggie/


Robert Chozick <rchozick@...>
 

There is a certain quality to the images that I like. I’m not sure I can describe it.   My other scopes come and go but I want to keep the FSQ   

Robert 


On Aug 2, 2020, at 8:05 PM, Dean Jacobsen <deanjacobsen@...> wrote:

On Sun, Aug 2, 2020 at 06:01 PM, Robert Chozick wrote:
After looking at many different images with the N and newer version I want to keep my fluorite. 
Why?
 
--
Dean Jacobsen
http://astrophoto.net/wp/
Image Gallery - http://astrophoto.net/wp/image-gallery/
Astrobin - https://www.astrobin.com/users/deanjacobsen/ 


Stuart <stuart.j.heggie@...>
 

I think the FSQn's were colour corrected for film and people complained about the blue halos when super blue sensitive ccd's came on the scene. It didn't bug me but I had run out of things to image with it and wanted the AP130EDT for visual and solar.


On Sun, 2 Aug 2020 at 22:13, Robert Chozick via groups.io <rchozick=aol.com@groups.io> wrote:
There is a certain quality to the images that I like. I’m not sure I can describe it.   My other scopes come and go but I want to keep the FSQ   

Robert 


On Aug 2, 2020, at 8:05 PM, Dean Jacobsen <deanjacobsen@...> wrote:

On Sun, Aug 2, 2020 at 06:01 PM, Robert Chozick wrote:
After looking at many different images with the N and newer version I want to keep my fluorite. 
Why?
 
--
Dean Jacobsen
http://astrophoto.net/wp/
Image Gallery - http://astrophoto.net/wp/image-gallery/
Astrobin - https://www.astrobin.com/users/deanjacobsen/ 


--

Stuart
http://www.astrofoto.ca/stuartheggie/


christian viladrich
 

With my old FSQ-106, I use an L filter (cutting UV and IR). Star images in L or B are very fine.

Christian

Le 03/08/2020 à 02:24, Stuart a écrit :
I think the FSQn's were colour corrected for film and people complained about the blue halos when super blue sensitive ccd's came on the scene. It didn't bug me but I had run out of things to image with it and wanted the AP130EDT for visual and solar.


On Sun, 2 Aug 2020 at 22:13, Robert Chozick via groups.io <rchozick=aol.com@groups.io> wrote:
There is a certain quality to the images that I like. I’m not sure I can describe it.   My other scopes come and go but I want to keep the FSQ   

Robert 


On Aug 2, 2020, at 8:05 PM, Dean Jacobsen <deanjacobsen@...> wrote:

On Sun, Aug 2, 2020 at 06:01 PM, Robert Chozick wrote:
After looking at many different images with the N and newer version I want to keep my fluorite. 
Why?
 
--
Dean Jacobsen
http://astrophoto.net/wp/
Image Gallery - http://astrophoto.net/wp/image-gallery/
Astrobin - https://www.astrobin.com/users/deanjacobsen/ 

--

Stuart
http://www.astrofoto.ca/stuartheggie/


Robert Chozick <rchozick@...>
 

Thanks Christian. I also use a luminance filter and will continue to do so. 

Robert 


On Aug 4, 2020, at 3:09 AM, christian viladrich <christian.viladrich@...> wrote:



With my old FSQ-106, I use an L filter (cutting UV and IR). Star images in L or B are very fine.

Christian

Le 03/08/2020 à 02:24, Stuart a écrit :
I think the FSQn's were colour corrected for film and people complained about the blue halos when super blue sensitive ccd's came on the scene. It didn't bug me but I had run out of things to image with it and wanted the AP130EDT for visual and solar.


On Sun, 2 Aug 2020 at 22:13, Robert Chozick via groups.io <rchozick=aol.com@groups.io> wrote:
There is a certain quality to the images that I like. I’m not sure I can describe it.   My other scopes come and go but I want to keep the FSQ   

Robert 


On Aug 2, 2020, at 8:05 PM, Dean Jacobsen <deanjacobsen@...> wrote:

On Sun, Aug 2, 2020 at 06:01 PM, Robert Chozick wrote:
After looking at many different images with the N and newer version I want to keep my fluorite. 
Why?
 
--
Dean Jacobsen
http://astrophoto.net/wp/
Image Gallery - http://astrophoto.net/wp/image-gallery/
Astrobin - https://www.astrobin.com/users/deanjacobsen/ 

--

Stuart
http://www.astrofoto.ca/stuartheggie/