In fact, many of the images used in that book were taken with this setup. My good friend and co-author on The Visible Universe, Max Whitby, has a TOA-130 set up for remote imaging in Spain. For the 0.8x reducer (top), the minimum band is 0.463 and the maximum is 0.500, for a difference of 8.0%.For the flattener (bottom), the minimum band is 0.459 and the maximum is 0.475, for a difference of 3.4%.At first, it looks like there’s a lot going on, but when you look at the axis, you see how very small differences are exaggerated: Below are the outputs from PixInsight’s FlatContourPlot script.
Light falloff is also very well controlled by both the flattener and reducer. The reducer (left) looks like it introduces some eccentricity in the stars, but visually, it’s not an issue. I don’t find these as useful unless there is more severe eccentricity and I’m trying to diagnose an issue. The eccentricity plots are shown below if you’re interested. The takeaway is that there are not significant differences across the FOV in either case. In both cases, these values are typical for my skies, and these were taken on different nights, so any differences in absolute values cannot be attributed to the flattener or reducer. Since the image scale with the reducer is 1.01”/px, this is about 2.6-3.0”.
These are using green channel images, since that’s the middle of the spectrum. Now let’s look at the outputs of PixInsight’s FWHMEccentricty script. In both cases, stars are sharp to the edges. The images below show the center and corners of the ASI2600MM using both the flattener and the reducer. The images I got with the Photoline130 were very sharp. (These are uncorrected images below just to show the FOV.) Sharpness At 910 mm, I get a FOV of about 1.5°x1.0°.
The image below shows a comparison of the field of view with an APS-C sensor at the native 910 mm f/7 using the flattener and 728 mm f/5.6 using the reducer. Field of view: native and with the reducer Of course, spring is the worst time to get a scope, as I’ve barely had five clear nights in two months, but I’ve cobbled enough data together for a review, with a few finished images forthcoming. I have a ZWO EAF attached, which installed in about 5 minutes. I have no desire to swap it out for a Moonlite or Feathertouch, nor do I think either would offer a meaningful improvement. The 2.5” focuser is better than almost any other standard focuser I’ve seen. The 0.8x reducer is shown attached below, and as you can see, everything is very tight. At least when I bought the scope, the Gen1 reducer came up as a recommended accessory, so I didn’t notice the Gen2 until I’d looked around the site a bit. The Gen2 flattener (TSFLAT2.5G2) has a 55 mm backfocus, and saves you from buying several other adapters to connect the 2.5” focuser to standard astro-camera threadings. I bought both the 2.5” flattener and reducer. They also offer a matched flattener and 0.8x reducer in both 2.5” and 3.0” sizes. Since my main camera is a ZWO ASI2600MM with an APS-C sized sensor, I went with the 2.5” focuser. It comes with either a 2.5” or 3.0” rack and pinion focuser. After some research, I found that there are several similar models of 130 mm refractors, but TS-Optics appears to be the only vendor offering it with an FPL53 element. We are happy to help with the adaption.ĭifferent working distance for Apos and EDs with shorter focal lengths:The corrector can be used with refractors from 100 mm to 130 mm aperture.I have wanted a 130-140 mm refractor for a long time, and after failing to find a TEC140 or TOA130 in my price range, I was pleased to get a TS-Optics Photoline 130 this spring. Also DSLR and system cameras can be adapted without any problems. The working distance from the M48 thread to the camera sensorThe working distance is exactly 55 mm, so the connection of an astro camera, for example from ZWO, is no problem, because with the cooled cameras the adapters to 55 mm are always included. With optional extension adapters, for example to M68, the corrector can also be used for other telescopes. Nothing is pushed in, so that tilting is impossible. The corrector is simply screwed into the M63x1 connection thread on the focuser.
TS PHOTOLINE 130 AND ATIK 460 FULL
The stars are imaged pinpoint up to the edge, even with full frame sensors. TS Photoline 2.5" Corrector and Reducer for AstrophotographyThe corrector is calculated for the TS Photoline 130 mm f/7 apo and gives optimal results with this telescope.
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