Jump to content

Banner.jpg.b83b14cd4142fe10848741bb2a14c66b.jpg

STC Duo-Narrowband filter unboxing

Miguel1983

By Miguel1983
in Member Equipment Reviews

Recommended Posts

Miguel1983

Miguel1983

Posted
Posted

Hi,

I just received the STC Duo-Narrowband Filter, purchased at OV-Optics here in Belgium, not cheap, i hope it delivers ?

Anyway, the first light is for later, i hope we get some clear weather soon.

For now i have some foto's of whats in the box

IMG_6691.thumb.JPG.6e43cb1de64bf7cc036985aec5a0b20c.JPGIMG_6692.thumb.JPG.415e4c1179fb5a9e7ba0e208675634c4.JPGIMG_6693.thumb.JPG.d1ee435fcea1980dd04a96f804a174a4.JPGIMG_6694.thumb.JPG.696fd214aa7704b49c9e331d968eb7ae.JPGIMG_6695.thumb.JPG.13a8c7b406b6e54b13f35df044aa88e0.JPGIMG_6696.thumb.JPG.4fc00d65b83429482828c8356b8ed6ef.JPGIMG_6698.thumb.JPG.99a4f20d3e39b437e8d2447ef464b1cf.JPGIMG_6699.thumb.JPG.8603d38b2ea2ce02e326d22df8cb3295.JPGIMG_6700.thumb.JPG.3b59b615fafa7b64aa69126b2b1fa219.JPGIMG_6701.thumb.JPG.6f124bfba9d44fe765759b0eb54135bc.JPGIMG_6702.thumb.JPG.d743043d7a7918081aa3bd60f38c50ce.JPG

Link to comment
Share on other sites
  • Replies 53
  • Created
  • Last Reply
vlaiv

vlaiv

Posted
Posted

That is very interesting filter.

Do you have any stats on FWHM of those two peaks?

I can see one interesting benefit of such filter to try out - RGB like narrow band imaging - Shorter exposures in Ha, OIII and SII (provided that it covers all three wavelengths) for "color" and Lum done with such filter.

Link to comment
Share on other sites
Miguel1983

Miguel1983

Posted
  • Author
Posted
6 hours ago, vlaiv said:

That is very interesting filter.

Do you have any stats on FWHM of those two peaks?

I can see one interesting benefit of such filter to try out - RGB like narrow band imaging - Shorter exposures in Ha, OIII and SII (provided that it covers all three wavelengths) for "color" and Lum done with such filter.

Hi,

here is a more detailed graphic.

  • Passes two major narrowband 10nm transmission lines — Ha (656.3nm) & O-III (500.7nm) at high transmission rate (~90%)DuoNarrowband_Spectrum_2_EN.thumb.jpg.bdb41869dbe4f834d47a6e8277828215.jpg
  •  
Link to comment
Share on other sites
  • 2 weeks later...
Miguel1983

Miguel1983

Posted
  • Author
Posted

Hi,

got a chance last night to use the filter for the first time.

I chose The Horsehead Nebula, and took 25 5min subs, 10 darks  and this morning 100 bias and 100 flat frames.

There was still time until Orion shifted behind my house so for comparison i took 18 3min subs with the Baader Moon&Skyglow filter and darks, bias and flats.

By no means i got any processing skills i just fiddle along so go easy on me ?

 

Baader filter

1194798825_Moonskyglowstack.thumb.jpg.050673d4e361ba33c6c1b83f3b9b333c.jpg

 

STC Duo Narrowband filter

519777284_HorseheadNebulaNarrowbandStackfinal.thumb.jpg.10c70a2a0e7a7b69105c858e93676fcc.jpg

Link to comment
Share on other sites
Miguel1983

Miguel1983

Posted
  • Author
Posted
39 minutes ago, tooth_dr said:

That’s nice, looks like a great filter. Have you applied flats to your image as they don’t appear to be correcting properly. 

Yes, i used flats, but i think something went wrong or i took them wrong, the smudges did't dissapear unfortunatly.

As i mentionned, the processing bit of astrophotography isn't my strong point.

Link to comment
Share on other sites
tooth_dr

tooth_dr

Posted
Posted
1 minute ago, Miguel1983 said:

Yes, i used flats, but i think something went wrong or i took them wrong, the smudges did't dissapear unfortunatly.

As i mentionned, the processing bit of astrophotography isn't my strong point.

Miguel post your flat even just a single sub and we can get a look at it.  Flats are IMO crucial

Link to comment
Share on other sites
Miguel1983

Miguel1983

Posted
  • Author
Posted
2 hours ago, tooth_dr said:

Miguel post your flat even just a single sub and we can get a look at it.  Flats are IMO crucial

here you go

Light

HORSEHEAD NEBULA_LIGHT_300s_1600iso_+13c_Duo Narrowband_20181117-23h10m43s547ms.CR2

Flat

IMG_0343.CR2

Dark

HORSEHEAD NEBULA_DARK_300s_1600iso_+10c_Duo Narrowband_20181118-01h28m08s491ms.CR2

Bias

HORSEHEAD NEBULA_BIAS_Tv14000s_1600iso_Duo Narrowband_20181118-11h37m36s188ms.CR2

Link to comment
Share on other sites
tooth_dr

tooth_dr

Posted
Posted
50 minutes ago, Miguel1983 said:

here you go

Light

HORSEHEAD NEBULA_LIGHT_300s_1600iso_+13c_Duo Narrowband_20181117-23h10m43s547ms.CR2

Flat

IMG_0343.CR2

Dark

HORSEHEAD NEBULA_DARK_300s_1600iso_+10c_Duo Narrowband_20181118-01h28m08s491ms.CR2

Bias

HORSEHEAD NEBULA_BIAS_Tv14000s_1600iso_Duo Narrowband_20181118-11h37m36s188ms.CR2

Can you post jpegs, those are large and also Canon raw files. Sorry to be a pain 

Link to comment
Share on other sites
Miguel1983

Miguel1983

Posted
  • Author
Posted
7 hours ago, tooth_dr said:

Can you post jpegs, those are large and also Canon raw files. Sorry to be a pain 

No problem, here are the flat files

I took them with the white T-shirt method, same ISO speed as the lights and the shutterspeed was 1/125 - 1/160 for the Narrowband and 1/1000 for the Baader filter

 

Narrowband flat

1632473757_HorseheadnebulaSTCDuoNarrowbandFilterFlat.thumb.jpg.8b4b2c3a995b5d39b2ad5548242bd4b6.jpg

 

With the Baader filter

1107170193_HorseheadnebulaMoonSkyglowFlat.thumb.jpg.b0cb9f04208505169e4de318c13a9175.jpg

Link to comment
Share on other sites
The Admiral

The Admiral

Posted
Posted

One thought has crossed my mind following on from another thread:

Given that OIII and Ha are in quite different parts of the spectrum, can the filter be 'parfocal' for each wavelength, given that the 'optical' thickness will be different for each? Also, presumably if the 'scope isn't truly apochromatic, each of these wavelengths will focus at a different place. So all this leads me to wonder if the image can be truly in focus simultaneously for OIII and Ha? Any users care to comment? Otherwise, it has the potential to be a great time saver.

Ian

Link to comment
Share on other sites
The Admiral

The Admiral

Posted
Posted
46 minutes ago, artem said:

If the 2-Filter Combos is interesting !! then here is the 3-Filter Combo.. OPT Triad Tri-Band Narrowband Filter

https://optcorp.com/products/opt-triad-tri-band-narrowband-filter#shopify-product-reviews

Cheers

Martin

Is it strictly Tri-band? H-beta and OIII seem to be in the same pass-band and wouldn't be resolved. It does have a 3nm H-alpha pass-band though.

Filter TypeTriband
wavelengths H alpha/656.3/3nm
wavelengths Oiii/H beta/ Center 493/18nm
 
Ian
Link to comment
Share on other sites
Demonperformer

Demonperformer

Posted
Posted
52 minutes ago, artem said:

If the 2-Filter Combos is interesting !! then here is the 3-Filter Combo.. OPT Triad Tri-Band Narrowband Filter

https://optcorp.com/products/opt-triad-tri-band-narrowband-filter#shopify-product-reviews

 

Cheers

 

Martin

The only thing about this is that two of the three bands are showing you hydrogen - albeit that one is the alpha emission and the other is the beta emission.

Link to comment
Share on other sites
  • 4 weeks later...

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.