... .trying to decide on what to buy .Anyway, if I bought a UHC, do I still need a Minus-Violet filter? I think it should effectively minus off most of the Violet, am I right?
Celestron UHC
Celestron UHC
Anyone uses or used the Celestron UHC? How is it compared to Lumicon and Orion counterpart? Will appreciate your input ... .trying to decide on what to buy .
Anyway, if I bought a UHC, do I still need a Minus-Violet filter? I think it should effectively minus off most of the Violet, am I right?
... .trying to decide on what to buy .Anyway, if I bought a UHC, do I still need a Minus-Violet filter? I think it should effectively minus off most of the Violet, am I right?
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weixing
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Hi,
Have a nice day.
I had the Celestron LPR/UHC Filter. IMHO, this is a Broadband filter, not a Narrowband Filter which normally associate with UHC filter. So, it do not have the type of Narrowband bandwidth that Lumicon UHC or Orion UltraBlock filter have.Anyone uses or used the Celestron UHC? How is it compared to Lumicon and Orion counterpart? Will appreciate your input ... .trying to decide on what to buy .
IMHO, you don't even need a Minus-Violet filter for deep sky objects... the false colour won't be seen unless you point to those few bright stars.Anyway, if I bought a UHC, do I still need a Minus-Violet filter? I think it should effectively minus off most of the Violet, am I right?
Have a nice day.
Yang Weixing
"The universe is composed mainly of hydrogen and ignorance."
"The universe is composed mainly of hydrogen and ignorance." -
weixing
- Super Moderator
- Posts: 4708
- Joined: Wed Oct 01, 2003 12:22 am
- Favourite scope: Vixen R200SS & Celestron 6" F5 Achro Refractor
- Location: (Tampines) Earth of Solar System in Orion Arm of Milky Way Galaxy in Local Group Galaxies Cluster
Hi,
By the way, UHC mean Ultra High Contrast... it doesn't mean Narrowband. Also, LPR mean Light Pollution Reduction and it doesn't mean Broadband too... So best is to look at their spectral respond characteristics graph or at least look for the specific words... "Narrowband" or "Broadband" in their description.
Have a nice day.
My one indicate as UHC/LPR. Anyway, I think they only have one which called UHC/LPR.Which one is the one you are having? The LPR or the UHC/LPR?
By the way, UHC mean Ultra High Contrast... it doesn't mean Narrowband. Also, LPR mean Light Pollution Reduction and it doesn't mean Broadband too... So best is to look at their spectral respond characteristics graph or at least look for the specific words... "Narrowband" or "Broadband" in their description.
Have a nice day.
Yang Weixing
"The universe is composed mainly of hydrogen and ignorance."
"The universe is composed mainly of hydrogen and ignorance." -
weixing
- Super Moderator
- Posts: 4708
- Joined: Wed Oct 01, 2003 12:22 am
- Favourite scope: Vixen R200SS & Celestron 6" F5 Achro Refractor
- Location: (Tampines) Earth of Solar System in Orion Arm of Milky Way Galaxy in Local Group Galaxies Cluster
Hi,
If you look at the graph carefully, you'll notices the difference:
Start of 1st Bandpass
Celestron UHC/LPR:
The respond curve start at 440nm and start to peak at around 465nm.
Astronomik CLS:
The respond curve start at around 435nm and start to peak at around 455nm.
Astronomik UHC:
The respond curve start at around 465nm and start to peak at around 480nm.
End of 1st Bandpass
Celestron UHC/LPR:
The respond curve start to decline at 510nm and end at around 540nm.
Astronomik CLS:
The respond curve start to decline at 540nm and end at around 550nm.
Astronomik UHC:
The respond curve start to decline at 505nm and end at around 520nm.
Widest Bandwidth of 1st Bandpass
Celestron UHC/LPR: around 100nm
Astronomik CLS: around 115nm
Astronomik UHC: around 55nm
Start of 2nd Bandpass
Celestron UHC/LPR:
The respond curve start at 600nm and start to peak at around 640nm.
Astronomik CLS:
The respond curve start at around 630nm and start to peak at around 645nm.
Astronomik UHC:
The respond curve start at around 630nm and start to peak at around 650nm.
Astronomik CLS is the Astronomik version of broadband filter.
Anyway, base on the graph, I would said that the Celestron UHC/LPR is an improve broadband filter... somewhere between a broadband and a narrowband.
Have a nice day.
If you look at the graph carefully, you'll notices the difference:
Start of 1st Bandpass
Celestron UHC/LPR:
The respond curve start at 440nm and start to peak at around 465nm.
Astronomik CLS:
The respond curve start at around 435nm and start to peak at around 455nm.
Astronomik UHC:
The respond curve start at around 465nm and start to peak at around 480nm.
End of 1st Bandpass
Celestron UHC/LPR:
The respond curve start to decline at 510nm and end at around 540nm.
Astronomik CLS:
The respond curve start to decline at 540nm and end at around 550nm.
Astronomik UHC:
The respond curve start to decline at 505nm and end at around 520nm.
Widest Bandwidth of 1st Bandpass
Celestron UHC/LPR: around 100nm
Astronomik CLS: around 115nm
Astronomik UHC: around 55nm
Start of 2nd Bandpass
Celestron UHC/LPR:
The respond curve start at 600nm and start to peak at around 640nm.
Astronomik CLS:
The respond curve start at around 630nm and start to peak at around 645nm.
Astronomik UHC:
The respond curve start at around 630nm and start to peak at around 650nm.
Astronomik CLS is the Astronomik version of broadband filter.
Anyway, base on the graph, I would said that the Celestron UHC/LPR is an improve broadband filter... somewhere between a broadband and a narrowband.
Have a nice day.
- Attachments
-
- Celestron UHC/LPR Curve
- Celestron_uhc_lpr_filter.jpg (41.62 KiB) Viewed 4519 times
Last edited by weixing on Mon Jan 09, 2006 1:14 am, edited 5 times in total.
Yang Weixing
"The universe is composed mainly of hydrogen and ignorance."
"The universe is composed mainly of hydrogen and ignorance." -
weixing
- Super Moderator
- Posts: 4708
- Joined: Wed Oct 01, 2003 12:22 am
- Favourite scope: Vixen R200SS & Celestron 6" F5 Achro Refractor
- Location: (Tampines) Earth of Solar System in Orion Arm of Milky Way Galaxy in Local Group Galaxies Cluster
Hi,
Here is the curve of the Astronomik CLS (Broadband) and Astronomik UHC filter.
Have a nice day.
Here is the curve of the Astronomik CLS (Broadband) and Astronomik UHC filter.
Have a nice day.
- Attachments
-
- Astronomik UHC Curve
- Astronomik_UHC.jpg (47.42 KiB) Viewed 4519 times
-
- Astronomik CLS (Broadband) Curve
- Astronomik_LPR.jpg (59.08 KiB) Viewed 4519 times
Yang Weixing
"The universe is composed mainly of hydrogen and ignorance."
"The universe is composed mainly of hydrogen and ignorance." Thanks for the explanation.
Appreciate it alot
In your opinion, would it be better to get a LPR like Celestron or a UHC like Orion/Lumicon/Astronomik? been trying to figure it out. I had ruled out the old Celestron LPR totally, since the review by quite a few website (users of it) was that it is very much usless on city lighting. Never heard of any reviews of the new Celestron UHC/LPR though.
Appreciate it alot
In your opinion, would it be better to get a LPR like Celestron or a UHC like Orion/Lumicon/Astronomik? been trying to figure it out. I had ruled out the old Celestron LPR totally, since the review by quite a few website (users of it) was that it is very much usless on city lighting. Never heard of any reviews of the new Celestron UHC/LPR though.
I suggest you get an Orion Ultrablock - its on sale now, I ordered 2" one from OPT for US$96 including shipping ($80 for the filter) use paypal as well...go for Astronomik/Lumicon if you have extra $$ and want scratch resistant ones. Can also consider DGM optics NPB, it was on sale but now back to original price of US$150+shipping..highly rated as well.
Debash
