Hardware
ZWO SII 7nm CCD Imaging Filter - 1.25" Sulfur is in the deep red of the spectrum near 672 nm. When combined with H-a and OIII (Hydrogen-Alpha and Oxygen III, or double ionized oxygen) SII will produce images with colors that are reminiscent of those taken by the Hubble Space Telescope. The ZWO SII 7nm Filter is mounted in a metal 1.25" cell and comes in a protective plastic case. ZWO narrowband filters are fine-optically polished to reach an accuracy of 1/4 wave. Their performance is further enhanced by multiple layers of anti-reflection coatings.
ZWO H-Alpha 7nm CCD Imaging Filter - 1.25"hydrogen, and is responsible for the red color seen in most nebulae. Explore one of the main building blocks of our universe by imaging in Hydrogen-Alpha with a ZWO ASI camera, a filter wheel, and this Hydrogen-Alpha is the most dominant emission line in star-forming regions. H-Alpha light, at 656nm, is created by The ZWO Ha 7nm Filter is mounted in a metal 1.25" cell and comes in a protective plastic case. ZWO narrowband filters are fine-optically polished to reach an accuracy of 1/4 wave. Their performance is further enhanced by multiple layers of anti-reflection coatings.atomic narrowband filter!
The 1-1/4" OIII narrowband filter isolates just the two doubly-ionized oxygen lines (496 and 501nm lines) emitted by planetary and emission while blocking the rest of the overall spectrum of light. The result is nebulae extreme contrast between the black sky background and the faint photons of OIII light needed for detailed views of the Veil, Ring, Dumbbell, Crescent and Orion nebulae, among other objects. Each filter has an ultra hard, vacuum-deposited coating carefully designed to block all of the visual spectrum ranging from 400 to 700 nm This eliminates the un-natural colored halos surrounding bright stars common with O III filters of less sophisticated coating technology.
The ZWO IR-Cut Filter blocks infrared light from reaching the sensor of your CCD or CMOS camera. When imaging, the addition of this simple and inexpensive accessory will result in sharper images. Infrared or IR light is invisible to the human eye, and so blocking the infrared with a filter is not important if you are using your telescope visually. However, when you add a camera to the mix, it's a whole other story! Unlike the human eye, a silicon sensor is very sensitive to light in the infrared portion of the spectrum and left unfiltered, your images will not be as sharp as you would like. This problem can easily be solved by blocking the infrared, and the ZWO IR Cut-Off, or Blocking Filter, will do just that. The ZWO IR-Cut filter is housed in a 1.25” cell and has internal threads so that you can stack filters together. The filter comes with a protective plastic case.
Ultra high contrast (UHC) LPR Our 1-1/4" Light Pollution Reduction (LPR) Filters are designed to selectively reduce the transmission of certain wavelengths of light, specifically those produced by artificial light. This includes mercury vapor, and both high and low-pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. sky glow). The new ultra high contrast (UHC) LPR filter has improved contrast over the typical broadband filters. Sky background is darker, and contrast of emission nebulae are noticeably improved. The advanced technology coatings enable the filter to achieve an outstanding transmission of over 97% across the entire bandpass, with total blockage of prominent light pollution lines. The perfect filter for viewing nebula from light polluted skies, or for boosting the contrast of nebula from dark sky sites. In addition to it's optimum spectral and optical characteristics, the UHC/LPR filter offers important features that set it apart and result in the highest quality celestial views: The multi-layer dielectric coatings are plasma assisted and Ionbeam hardened using the latest technology for durability and resistance to scratching. Improved transmission translates to maximum image brightness and contrast. Users of smaller, 4"-11" telescopes will especially appreciate the high efficiency, and larger scope users will love the rich star fields and detailed subtle nebular shadings that are left intact. The high transmission, sharp cutoffs, and more moderate 60nm passband of the UHC/LPR filter bandpass and inclusion of an extremely efficient H-Alpha passband (656nm).retains a more natural view, yet significantly boosts overall contrast. Imagers will appreciate the broader bandpass and inclusion of an extremely efficient H-Alpha passband (656nm).
Image Cameras
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ZWO ASI1600mm cool
Sensor: 4/3 CMOS
Diagonal: 21.9mm
Resolution: 16Mega Pixels 4656×3520
Pixel Size: 3.8µm
Max FPS at full resolution :23FPS
Shutter: Rolling shutter
Exposure Range: 32µs-2000s
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ASI294MC Pro
4.63 Mega Pixel CMOS
Sensor: 4/3″ SONY IMX294 CMOS.
Diagonal: 23.2mm.
Resolution: 10.7 Mega Pixels (4144 X 2822) Pixel
4.63 * 206.3 / 2032 = .470 scale​
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Canon T6i
24 Mega Pixel CMOS
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Orion StarShoot AutoGuider
5.4 Mega Pixel Mono
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QHY 5L II Mono
3.7 Mega Pixel Mono
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Formula to determine image scale.
Scale = Camera pixel size in (Microns) * 206.3/ focal length.
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Example: QHY 5L at 3.7MP * 206.3 / Newtonian 750mm f/l = 1.045
In the means of 1.045 between 1 and 2 is considered the perfect values of not being over / under sampled. Values less than one is over sampled while values greater than two is under sampled for the combination of camera's mega pixel and OTA focal length. However in my case, I image pretty good even though I am over sampling, it really depends how you apply focusing and balancing your exposure times to achieve the perfect images.
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Guider Scopes
Pixel Orion StarShoot AutoGuider 50mm at 162mm focal
Stellarvue F50 50mm at 210mm focal
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Optical Tubes
For 0750mm Newtonian 150mm : 1.045 arcsecs per pixel FOV 81.10 arcmins
For 0952mm Explorer Scientific 127mm : 0.823 arcsecs per pixel FOV 67.00 arcmins
For 1000mm Astrograph 254mm : 0.784 arcsecs per pixel FOV 60.82 arcmins
For 1016mm GSO Newt 254mm : 0.771 arcsecs per pixel FOV 59.87 arcmins
For 1280mm F/6.3 SCT 203mm : 0.612 arcsecs per pixel FOV 47.52 arcmins
For 1350mm Ritchey-Chretien : 0.579 arcsecs per pixel FOV 58.52 arcmins
For 2032mm SCT its 203mm : 0.386 arcsecs per pixel FOV 29.93 arcmins
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Field of View Calculator
http://www.skyatnightmagazine.com/astronomy-field-view-calculator
