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Equipment Discussions >> Equipment

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Heitman
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Reged: 01/26/07

Loc: Reeds, NC
Denkmeier Hi-Def UHC Filter?
      #5653334 - 01/30/13 10:23 PM

Hi,
I've been doing a lot of searching and reading on the various UHC Narrow-band filters, and was curious if anyone has firsthand experience with the Denkmeier Hi-Def UHC Narrow-band filter. Thanks, Tim


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David Knisely
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Reged: 04/19/04

Loc: southeastern Nebraska
Re: Denkmeier Hi-Def UHC Filter? new [Re: Heitman]
      #5653533 - 01/31/13 02:08 AM

OK, the specs sheet shows a filter bandwidth (Full Width at Half Maximum) of about 397 angstroms which is a little too broad to make a good narrow-band nebula filter. It also shows a peak transmission of 100% which might be stretching believability a little, as most quality production interference filters with this kind of bandwidth rarely have peak transmissions much higher than 97%. It is a "compromise" filter with a bandwidth between that of a broad-band LPR filter and a narrow-band nebula filter. In short, it is a "jack of all trades, master of none" when it comes to a filter for deep-sky objects. It will dim continuum objects like star clusters and galaxies more than the broad-band LPR filters do. It would work on emission nebulae to some degree, but won't quite provide as much of a contrast boost as a true narrow-band nebula filter like the DGM Optics NPB, Orion Ultrablock, or the Lumicon UHC filter (the "true" UHC filter). If you want a good nebula filter, I would recommend the DGM NPB, Orion Ultrablock, or Lumicon UHC as better alternatives. Clear skies to you.

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Heitman
sage
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Reged: 01/26/07

Loc: Reeds, NC
Re: Denkmeier Hi-Def UHC Filter? new [Re: David Knisely]
      #5653759 - 01/31/13 07:51 AM

Thanks David. I looked at the spec sheet also, and it seemed a little wide to me. Just curious what others think about it.
Tim


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