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What imaging scope to get a wider field of veiw than my 150 PDS


VikN46

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Whilst this is not an immediate purchase but maybe in the next month or two and I would like to add to my 150P DS (which I love). The main aim to get a wider field of view when imaging for bigger DSO's. It would be used with my 600D DSLR but one day way in the future and only once I have gone as far as I can with a DSLR I will upgrade to a CCD but am in no rush to do this.

Budget about £500 inc flattener/reducer.

Current Ideas are:

SW 80ED Pro
WO Zenithstar ZS71 (inc reducer)

Any other options to throw into the mix or opinions/experience of either scope or others.

It will help me 'guide' the hubby to the right scope for the job he knows I want another one and he keeps mentioning it as a wedding anniversary/birthday/Christmas pressie rolled into one...... fingers crossed!

Thanks in advance :)

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The 130 isn't that much shorter than the 150. 650 vs 750. The reduced ED80 is about 510mm I think ( going from memory so may well be wrong) the ZS71 with reducer is 335mm, now that is wider! Not as well corrected as the ED80 by many accounts so it makes sense to check with a FOV simulator like 12dstring or Blackwaterskies imaging toolbox what sort of field you will end up with and then make a choice. Check that the arcsec pee pixel stays in a reasonable range as well. 1-3 is generally held to be optimum for the UK but I have seen very nice images well outside this range.

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The ZS71 certainly gives you a wide field and a good pixel size match with the 600D/650D it does have some reported issues with the blue end of the spectrum but not something i have personally noticed in my images but this could be related to getting "best focus" rather than perfect focus which is why i never use a bat mask or software focus tools.

The idea of a camera lens is also worth considering 200mm FL gives you an ideal image scale for the larger targets.

This is an uncropped image with the ZS71 and FR/FF with my canon 650D which should give you an idea of scale

Alan

post-32578-0-86186000-1409727113_thumb.p

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This is the approximate FOV of each setup:

150PDS + Coma Corrector (http://www.blackwaterskies.co.uk/p/imagingtoolbox.html?BWSFOV=%7B%22version%22%3A2%2C%22fovStyle%22%3A%22MA%22%2C%22fovYOffset%22%3A0%2C%22fovXOffset%22%3A0%2C%22compDesc%22%3A%22150PDS-600D-CC%22%2C%22compDisplay%22%3Atrue%2C%22searchTarget%22%3A%22%22%2C%22searchPopular%22%3A%22%22%2C%22gotoRaHD%22%3A10.60959117152608%2C%22gotoAddSign%22%3A%22%22%2C%22gotoDecDD%22%3A41.279791980511646%2C%22fovWidth%22%3A1.89%2C%22fovHeight%22%3A1.26%2C%22fovColour%22%3A%22%2300FFFF%22%2C%22fovRotation%22%3A53%2C%22fovAppH%22%3A1.31350585224647%2C%22fovAppV%22%3A1.3137709738348946%2C%22fovScopeRes%22%3A0.7733333333333333%2C%22searchSurveySelection%22%3A%22P%2FDSS2%2Fcolor%22%2C%22gotoRaH%22%3A0%2C%22gotoRaM%22%3A42%2C%22gotoRaS%22%3A26.301881166259307%2C%22gotoDecD%22%3A41%2C%22gotoDecM%22%3A16%2C%22gotoDecS%22%3A47.25112984192721%2C%22ccdWidth%22%3A22.2912%2C%22ccdHeight%22%3A14.8608%2C%22ccdFocalLength%22%3A675%2C%22pixelWidth%22%3A4.3%2C%22pixelHeight%22%3A4.3%2C%22pixelHRes%22%3A5184%2C%22pixelVRes%22%3A3456%2C%22pixelFocalLength%22%3A675%2C%22pixelAperture%22%3A150%2C%22equipReducer%22%3A0.9%2C%22equipRawFL%22%3A750%2C%22equipFocalLength%22%3A675%2C%22equipAperture%22%3A150%2C%22equipCameraVal%22%3A%22%7B%5C%22pixelWidth%5C%22%3A%5C%224.3%5C%22%2C%5C%22pixelHeight%5C%22%3A%5C%224.3%5C%22%2C%5C%22ccdWidth%5C%22%3A%5C%2222.29%5C%22%2C%5C%22ccdHeight%5C%22%3A%5C%2214.86%5C%22%2C%5C%22pixelHRes%5C%22%3A%5C%225184%5C%22%2C%5C%22pixelVRes%5C%22%3A%5C%223456%5C%22%7D%22%2C%22equipCameraText%22%3A%22Canon%20EOS-550D%20%2F%2060D%20%2F%2060Da%20%2F%20600D%20%2F%20650D%20%2F%207D%20%2F%20700D%22%2C%22equipScopeVal%22%3A%22%7B%5C%22aperture%5C%22%3A%5C%22150%5C%22%2C%5C%22focalLength%5C%22%3A%5C%22750%5C%22%7D%22%2C%22equipScopeText%22%3A%22Skywatcher%20Explorer%20150P%22%2C%22zoom%22%3A3.452221250556239%7D)

80ED + Focal Reducer (http://www.blackwaterskies.co.uk/p/imagingtoolbox.html?BWSFOV=%7B%22version%22%3A2%2C%22fovStyle%22%3A%22MA%22%2C%22fovYOffset%22%3A0%2C%22fovXOffset%22%3A0%2C%22compDesc%22%3A%22ED80-600D-FR%22%2C%22compDisplay%22%3Atrue%2C%22searchTarget%22%3A%22%22%2C%22searchPopular%22%3A%22%22%2C%22gotoRaHD%22%3A10.60959117152608%2C%22gotoAddSign%22%3A%22%22%2C%22gotoDecDD%22%3A41.279791980511646%2C%22fovWidth%22%3A2.5%2C%22fovHeight%22%3A1.67%2C%22fovColour%22%3A%22%2300FF00%22%2C%22fovRotation%22%3A80%2C%22fovAppH%22%3A1.7379892308508376%2C%22fovAppV%22%3A1.7386034702367756%2C%22fovScopeRes%22%3A1.45%2C%22searchSurveySelection%22%3A%22P%2FDSS2%2Fcolor%22%2C%22gotoRaH%22%3A0%2C%22gotoRaM%22%3A42%2C%22gotoRaS%22%3A26.301881166259307%2C%22gotoDecD%22%3A41%2C%22gotoDecM%22%3A16%2C%22gotoDecS%22%3A47.25112984192721%2C%22ccdWidth%22%3A22.2912%2C%22ccdHeight%22%3A14.8608%2C%22ccdFocalLength%22%3A510%2C%22pixelWidth%22%3A4.3%2C%22pixelHeight%22%3A4.3%2C%22pixelHRes%22%3A5184%2C%22pixelVRes%22%3A3456%2C%22pixelFocalLength%22%3A510%2C%22pixelAperture%22%3A80%2C%22equipReducer%22%3A0.85%2C%22equipRawFL%22%3A600%2C%22equipFocalLength%22%3A510%2C%22equipAperture%22%3A80%2C%22equipCameraVal%22%3A%22%7B%5C%22pixelWidth%5C%22%3A%5C%224.3%5C%22%2C%5C%22pixelHeight%5C%22%3A%5C%224.3%5C%22%2C%5C%22ccdWidth%5C%22%3A%5C%2222.29%5C%22%2C%5C%22ccdHeight%5C%22%3A%5C%2214.86%5C%22%2C%5C%22pixelHRes%5C%22%3A%5C%225184%5C%22%2C%5C%22pixelVRes%5C%22%3A%5C%223456%5C%22%7D%22%2C%22equipCameraText%22%3A%22Canon%20EOS-550D%20%2F%2060D%20%2F%2060Da%20%2F%20600D%20%2F%20650D%20%2F%207D%20%2F%20700D%22%2C%22equipScopeVal%22%3A%22%7B%5C%22aperture%5C%22%3A%5C%2280%5C%22%2C%5C%22focalLength%5C%22%3A%5C%22600%5C%22%7D%22%2C%22equipScopeText%22%3A%22Skywatcher%20Evostar%2080ED%20DS%20Pro%22%2C%22zoom%22%3A4.189495179520259%7D)

ZS71 + Focal Reducer (http://www.blackwaterskies.co.uk/p/imagingtoolbox.html?BWSFOV=%7B%22version%22%3A2%2C%22fovStyle%22%3A%22MA%22%2C%22fovYOffset%22%3A0%2C%22fovXOffset%22%3A0%2C%22compDesc%22%3A%22WOZS71-600D-FR%22%2C%22compDisplay%22%3Atrue%2C%22searchTarget%22%3A%22%22%2C%22searchPopular%22%3A%22%22%2C%22gotoRaHD%22%3A10.60959117152608%2C%22gotoAddSign%22%3A%22%22%2C%22gotoDecDD%22%3A41.279791980511646%2C%22fovWidth%22%3A3.82%2C%22fovHeight%22%3A2.55%2C%22fovColour%22%3A%22%23FF00FF%22%2C%22fovRotation%22%3A50%2C%22fovAppH%22%3A2.6515727384300902%2C%22fovAppV%22%3A2.653754732768834%2C%22fovScopeRes%22%3A1.6338028169014085%2C%22searchSurveySelection%22%3A%22P%2FDSS2%2Fcolor%22%2C%22gotoRaH%22%3A0%2C%22gotoRaM%22%3A42%2C%22gotoRaS%22%3A26.301881166259307%2C%22gotoDecD%22%3A41%2C%22gotoDecM%22%3A16%2C%22gotoDecS%22%3A47.25112984192721%2C%22ccdWidth%22%3A22.2912%2C%22ccdHeight%22%3A14.8608%2C%22ccdFocalLength%22%3A334%2C%22pixelWidth%22%3A4.3%2C%22pixelHeight%22%3A4.3%2C%22pixelHRes%22%3A5184%2C%22pixelVRes%22%3A3456%2C%22pixelFocalLength%22%3A334%2C%22pixelAperture%22%3A71%2C%22equipReducer%22%3A0.8%2C%22equipRawFL%22%3A418%2C%22equipFocalLength%22%3A334.40000000000003%2C%22equipAperture%22%3A71%2C%22equipCameraVal%22%3A%22%7B%5C%22pixelWidth%5C%22%3A%5C%224.3%5C%22%2C%5C%22pixelHeight%5C%22%3A%5C%224.3%5C%22%2C%5C%22ccdWidth%5C%22%3A%5C%2222.29%5C%22%2C%5C%22ccdHeight%5C%22%3A%5C%2214.86%5C%22%2C%5C%22pixelHRes%5C%22%3A%5C%225184%5C%22%2C%5C%22pixelVRes%5C%22%3A%5C%223456%5C%22%7D%22%2C%22equipCameraText%22%3A%22Canon%20EOS-550D%20%2F%2060D%20%2F%2060Da%20%2F%20600D%20%2F%20650D%20%2F%207D%20%2F%20700D%22%2C%22equipScopeVal%22%3A%22%7B%5C%22aperture%5C%22%3A%5C%2271%5C%22%2C%5C%22focalLength%5C%22%3A%5C%22418%5C%22%7D%22%2C%22equipScopeText%22%3A%22William%20Optics%20ZenithStar%2071%22%2C%22zoom%22%3A6.950076728220702%7D)

post-18840-0-35648400-1409731474.png

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