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Thread: Filter recommendations for a monochrome camera?

  1. #1
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    Default Filter recommendations for a monochrome camera?



    First a bit of background as it may be relevant both in terms of understanding why I got the camera and in the ways a filter might be used. I've generally used nothing but a standard IR filter and I know that I'm not even close to the most sophisticated person regarding filter use.

    I got an ASI183MM Pro yesterday. For those who don't know it is a 20MP monochrome sensor with 2.4 micron pixels. This is a smaller sensor than the kinds I tend to gravitate toward and it has only a 15.86mm diagonal measurement.

    But I have several refractors with relatively short focal lengths (William Optics GT-71 & Tele Vue NP101is) and this will reduce but not eliminate under-sampling with those optics. Also, given those relatively short focal lengths I'll still have a decent FOV. It will pain me to be missing so much of the light which my optics are capturing, but I've the ASI971MC Pro and an ASI1600MC (updated to version 3) for when I'll accept the under-sampling in favor of the wider FOV.

    Most recently I've been messing with the Comet Hunter a bit more and the sampling using the ASI183 should be pretty good most of the time. I get some significant (but not really bad) vignetting when using the ASI071 with the Comet Hunter so one can argue that going to a smaller sensor isn't that big a loss with that OTA.

    In some sense the camera has to be considered to have impressive specifications. The small pixels still provide 12-bit data with a read noise of only 1.6e. The monochrome sensor has a QE of 84%!!! Dark current is reportedly low. But there are reports of some problems with amp-glow - going with the Pro version of the camera helps to control that particular problem.

    The imaging style for the foreseeable future is OAP (Observational AstroPhotography) in that the primary intent is to observe whilst using the camera. Saving subs is a secondary option and I often don't. So the subs will generally be relatively short (think in terms of seconds rather than minutes) and there will be more of them. SharpCap is the currently preferred software for this purpose.

    Some of this OAP may be done in horrible light pollution (shopping center in a big city with something like 6 streetlamps within 60 feet) for public outreach. Mostly backyard, however, with merely moderate light pollution.

    I have no current interest in doing LRGB imaging. Think zero interest.

    Some interest in later doing narrowband imaging but in the usual sense in which this is done (using several different narrowband filters and then using something like the Hubble Palette) this is unlikely to happen within the next year or two.

    OK, hopefully that is enough background for the moment.

    My current interest is to use a fairly standard AP light pollution filter from some place like Lumicon. Of significant interest is OPT's Triad filter which I would think would be very interesting for the horribly light-polluted public outreach event(s).

    I do not have a filter wheel and do not intend to get one in the near future but if I go to conventional narrowband imaging I will consider getting one at that time.

    At times I may use the camera on things like globular clusters with the Meade LS-8. This would be substantially over-sampled but I'm not totally convinced that the Nyquist Theorem fully applies to AP. I've seen images which seemed to do better than the Nyquist Theorem would suggest and it has been pointed out that the nature of our data isn't really what the Nyquist Theorem was designed for. So I'm interested in seeing what the camera will do at a rather long focal length with short subs to avoid some of the turbulence issues. Since the read noise is so low there is minimal penalty to over-sampling so I really don't lose much by playing with things.

    So I'd be quite interested what ideas people would have about filters of interest for use with that camera and OTAs.

    Thank you!
    Last edited by OleCuss; 11-24-2018 at 04:17 PM.
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    Default Re: Filter recommendations for a monochrome camera?

    I am going to bypass all of the oversampling and Nyquist theorem stuff and go right to the filter question. Your filter selection should depend upon what wavelengths of light you want to get rid of if light pollution is your problem. The types of lamps that are being used in your area would determine what wavelengths of light to concern yourself with. If your light pollution tends to be due to continuous spectrum emissions then going with narrow band filters for H alpha or OIII should give you the best increase in contrast for your images. The OPT triad filter is an interesting option in this case.
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    Default Re: Filter recommendations for a monochrome camera?

    Hello,

    the OPT Triad filter, accoirding to its specifications

    Filter TypeTriband
    Free ShippingYes
    ManufacturerOPT
    ShapeRound
    wavelengthsH alpha/656.3/3nm
    wavelengthsOiii/H beta/ Center 493/18nm

    sounds like a very good choice for both viewing and b/w capturing nebulas under the heavily light polluted skies.
    It is not a triband filter, but according to the specifications an extremely narrow passband dichroic filter,
    better suited than the other UHC filters on the market.

    Should we move under the urban skies, this filter would be my choice,

    JG
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    Default Re: Filter recommendations for a monochrome camera?

    the OPT Triad filter, accoirding to its specifications
    Dang thing is really expensive and still backordered unfortunately.

    I have seen this "Duo Band" filter recommended...

    https://stcoptics.com/en/astro_duo_narrowband/
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    Default Re: Filter recommendations for a monochrome camera?

    For purposes of getting the Triad it is a good thing that the IMX183 is a small sensor so a 1.25" filter should be quite suitable. It'd be nice to have the 2" but it's not so clear that I'll use the Triad with cameras with a sensor big enough to demand a 2".

    The Duo-narrowband looks rather interesting as well. Price is definitely better and the availability is nice!
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    Default Re: Filter recommendations for a monochrome camera?

    Hello all,

    reading the prices, the Orion Ultrablock, which makes the same on OIII/H-Beta, but does not pass H-Alpha,
    might be an alterantive - especially for visual, but missing H-Alpha would require much more total exposure times in AP.

    Unfortunately, the OPT Triband is not available in Germany.

    Best,

    JG
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    Default Re: Filter recommendations for a monochrome camera?

    Overall it looks like sticking with the Triad will likely be worth it in the long run. But that Duo-band from SCT Optics really isn't all that far off.
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