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Thread: Light pollution

  1. #1
    VineeWithTwoE's's Avatar
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    Default Light pollution



    I live in the middle of the city, and usually, drive 15 minutes out to a place somewhat darker. I want to take pictures of deep space objects, any tips? I have Orion XT6 and I usually use my phone with a mount to take pictures.
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    Default Re: Light pollution

    Drive even further. Nothing beats a clear dark sky.
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    My eyes
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    Default Re: Light pollution

    Mono and narrowband filters or get out of town!
    scopes :gso/bintel f4 12"trust tube, bresser messier ar127s /skywatcher 10'' dob
    cameras : asi 1600mm-c/asi1600mm-c,asi120mc,prostar lp guidecam, nikkon d60, sony a7
    mounts : eq6 pro/eq8
    filters : 2'' astronomik lp/badder lrgb h-a,sII,oIII,h-b,Baader Solar Continuum, Thousand Oaks Solar Filter.
    extras : skywatcher f4 aplanatic cc, Baader MPCC MKIII Coma Corrector,Orion Field Flattener,zwo 1.25''adc.starlight maxi 2" 9x filter wheel

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    Default Re: Light pollution

    With your 6" push-pull f/8 dob you will have a very tough time trying to photograph DSO's. Even the brightest DSO's will be too dim, and without some type of equatorial tracking, your exposure times will be very short. Filters are not going to help you at all, these make the exposure times longer. A darker sky only a marginal improvement. What pics you are able to take will not be anywhere like the fancy pics people take with more sophisticated equipment.

    Now, for the Moon and planets, things are better. As these are brighter, they are easier to photograph. You can also take an AV file with your phone, and then process the file with a software package such as Registax, and it is possible to produce quite a nice picture. No tracking in the mount is needed as the software aligns the frames. This system actually makes for a very good starting point for astro imaging. This is how I started put too, and I went to the extent of modifying a webcam to fit the focuser. The phone's camera controls are pretty good for this too.

    I hope this helps you.

    Alex.
    Last edited by mental4astro; 03-13-2018 at 06:52 AM.

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    helicon64 (03-13-2018)

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    Default Re: Light pollution

    Oh, and to AF!

    Alex.

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    Default Re: Light pollution

    Welcome to the forum.

    I agree with a lot of what mental4astro said. I do cellphone AP as a primary part of outreach and would consider a motorized mount of any kind a bare minimum for cellphone AP when it comes to DSOs. Even with an f/5 and shooting at high ISO something like M42 still takes seconds long exposures to show much of anything. As focal length or focal ratio increases, tracking becomes even more important. Not saying you can't take shots of DSOs without tracking, but as you can see HERE it severely limits things.

    Where cellphone AP really shines is in bright planetary, lunar and binary splitting. The tiny pixels, higher sensitivity, and fast frame rate 4K video of higher end phones these days allow them to pick up details that most dedicated cameras and DSLRs simply can't without a lot more effort.

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    viewing from SQM 16.4 suburbs
    Primary- Modified Meade SN8/LXD-55, LZOS 100 f/10 (AKA MC Rubinar grab and go) on a modified SLT mount (18650 mod, integrated BT module, etc)
    Fun- Celestron 130 f/5, 62 f/8 Houghton/Cass, Dob mount for my 130 and SN8

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    Default Re: Light pollution

    Hi Vinee and welcome to the forum. Some excellent information you've already received and I know you'll enjoy your time here.

    Bob

    Scopes: Skywatcher Star Discovery Mak 127 + SW 9x50 RACI on SynScan alt/az go-to mount; Saxon ST80; Bintel (GSO) 8" dob Eyepieces: SW kit 25mm, Starguider Dual ED 8mm and 15mm, SW 19mm flat field, SW 32mm Plossl, Vixen NLV 20mm, Svbony 12.5 mm illuminated reticle Barlows: SW 2x, Celestron Omni 2x Binoculars: Acuter 15x70, Olympus 10x50 DPSI

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    Default Re: Light pollution

    Hello and Welcome to the Forum!
    Michael
    Obsession 18" f/4.2, Zhumell Z10 f/4.9, ES AR 152 refractor f/6.5, Celestron Skymaster 15x70's , Bushnell 10x50's
    9x50mm RACI finder, Telrad, Rigel Quickfinder, 30mm Erfle, 9mm Plossl, and full line of ES eyepieces
    Imagination is more important than knowledge. Knowledge is Limited. Imagination Circles the World... A. Einstein


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    Default Re: Light pollution

    Welcome to the forums Vinee
    Refractors: Antares 105 f/15, Bresser 102XL f/13.2, Celestron 102 f/6.5, 2-150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, Vixen SD115s f/7.7
    Mounts: Manfrotto 055PRO, Celestron SLT, Celestron CG-5/ Argo Navis, Vixen SXP Binoculars: Celestron Eyepieces: A-Z

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    The weakest link in the optical chain is the large nut located directly behind the eyepiece/ camera. - Gabrielle
    Ya gotta keep this Apo/Achro thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

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    Default Re: Light pollution

    So... i have a phone with a phone that i can take 4k videos up to 20 mins... then it records a another video ... until the internal memory gets full ...

    soooo this is getting interesting since I have a alt-azi go-to mount with a 102 skyprodigy ... and on manual settings i can ISO 3200 and 30 secs... in theory I can get a telescope cell phone holder adapter, use the light pollution/moon filter on the diagonal and use the 25mm eyepiece or even the 9mm to take some video or picts ...

 

 
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