This focus motor is compatible with all celestron scts from 6 to 14 in aperture that have been produced since the year 2006. How do i collimate my schmidtcassegrain telescope sct. Basically, its a twopart process stage 1 rough collimation setup the scope and put a medium bright star in the field of an eyepiece. This article addresses these conditions, and provides some further pointers on sct collimation. Defocus the star until it appears as a donut like the photo below. Collimating your sct rod mollise basically, its a twopart process stage 1 rough collimation setup the scope and put a medium bright star in the field of an eyepiece. Observe a bright star magnitude 0 or 1 at a magnification of about the diameter of the telescope in millimeters. Installation of new components and reassembly of telescope. Collimating an sct is simply a matter of adjusting the three screws on the secondary mirror. I collimated this scope twice, using a bright star, per the manufacturers instructions. Recollimation of the telescope may be necessary after a secondary mirror position adjustment. By increasing the distance of the lasers from the sct you can make it even more accurate, and when i finally settled on the collimation and star tested it the result was as good as can be. When i aimed this little gem at the optics and defocused the light, it was immediately clear that i had work to do.
File attached as pdf because i cant attach svg to a cn post. Instructions are available as pdf files in english, french, german, italian. Sct is listed in the worlds largest and most authoritative dictionary database of abbreviations and acronyms the free dictionary. Cassegrain telescope sct design can only be collimated by adjusting the tilt of. The latter was an israeli brand launched in the 1960s, serving the highend printing and publishing industry. The tilt of the mirror is tested by viewing an outoffocus star image through the telescope. Recommended software programs are sorted by os platform windows, macos, linux, ios, android etc. Sct files include grayscale or coloured images and tend to be very large and difficult to transfer and store. This may take an hour but is important as the effects of thermal plumes can mimic poor collimation. Sct collimation under adverse circumstances astromart. I removed a factory collimation screw and now the knob threads wont reach. Alignment is easy using the small opening on one end and thin cross hairs at the other end.
Plate which is in the files section of two different yahoo groups. Click on the tab below to simply browse between the. Before attempting to open an sct file, youll need to determine what kind of file you are dealing with and whether it is even possible to open or view the file format. Close focus is the point of closest focus you can use on your telescope. Scitex continuous tone ct format is used for highend image processing on scitex computers. Looking for online definition of sct or what sct stands for. Bad seeing also results in bad doughnuts which make collimation difficult. This is an uncompressed format for storing bitmaps in grayscale or in the rgb or cmyk color systems. Kitchen table collimation of a cassegraintype reflector british. These files are generated for input using a scitex scanner. Always approach collimation with a light handa mere fraction of a turn may be all that is required.
Select the browse button in the top right of sct updater. How to correct flares and sharply focus on my telescope when viewing planets. Written by adam bialek forum member hitchhiker, pcfe is a vb application that takes as input one or more directories containing bmp files, allows you to set options for ppmcentre, and it will run anthony wesleys ppmcentre program on the command line. Unfortunately, many new cat owners seem intimidated by this simple process. However this is not a problem, the method of collimation is equally as simple as. Instructions are available as pdf files in english, french, german, italian, japanese, and spanish. It can be created in adobe photoshop or on scitex workstations using scanners for the highquality processing and preparation of high quality images for printing. Figure 8 the view through the focusing tube of a collimated sctwith. The farther you put the target away, the more accurate it will be as you are increasing the f ratio of the collimation beam. Click, drag, and drop to reorder files or press delete to remove any content you dont want.
Clearsilver is a fast, powerful, and languageneutral template system. And, by god, is it critical for good cat performance. A tribahtinov mask for aiding collimation and focusing of schmidt. Use this manual in conjunction with the onscreen instructions provided by the hand control. Sct collimation the newfangled way uncle rods astro blog. How to merge pdfs and combine pdf files adobe acrobat dc.
A tri bahtinov mask for aiding collimation and focusing of schmidt. The celestron cheshire collimation eyepiece is ideal for precise collimation of newtonians and helpful for aligning schmidtcassegrains. How to open and convert files with sct file extension. Before you combine the files into one pdf file, use merge pdf to draganddrop pages to reorder or to delete them as you like.
William royce offers mirrors of this type in a newtonian format. Collimation of a sct is critical to getting the sharpest images possible, especially when viewing planets at high magnification. With more than 5,000 times the lightgathering power of. Metaguide is a webcam based tool for precise collimation of the infocus diffraction pattern of a star. Ive never collimated a refractor before, but i have collimated my sct and quite a few reflectors so i understand the objective pretty well. Align your sct quickly, easily, and in broad daylight with.
It is necessary to attach the hollow sctadapter first remove the laser from the adapter, and with the use of a 2 to. Step 2 choose the pdf format from the dropdown list as the output format, and click the convert button, you can convert up to 5 files at the same time and a maximum size of up to 300 mb. Every day thousands of users submit information to us about which programs they use to open specific types of files. The coarse collimation procedure is also given in our instructions, along with some illustrations. All uploads and downloads are deemed secure and files are permanently deleted from the smallpdf servers within an hour. Appendix bcollimation the backyard astronomers guide. Collimation is the process of lining up the various optical elements in a telescope. All file types, file format descriptions, and software programs listed on this page have been individually researched and verified by the fileinfo team. We just released new firmware and tune revision for part number. The collimation eyepiece is more accurate than the simple.
The celestron edgehd a flexible imaging platform at an affordable price by the celestron engineering team abstract. At the center of the guide are the reference designations for the screws and their orientation as you face the front of the telescope. Browse your computer to the custom tune file location. This changes the tilt of the mirror and aligns it with the fixed primary mirror. Rearrange individual pages or entire files in the desired order. If windows keeps asking you what program should be used to open the file, the problem is most possibly caused by broken files associations. There are three stages to a really good collimation using the stars or a starlike source such as a solar reflection off a distant ball bearing or christmas tree ornament. Adobe photoshop among other adobe products can also be used to create, view and edit or modify sct raster image files, and these adobe products provide support for both microsoft windows and macbased systems through different versions of their applications. Our goal is to help you understand what a file with a. On a night with steady star images, set up the telescope, and let it cool to outside air temperature. Metaguide also autoguides and has several novel features that allow optimal guiding of midrange mounts under typical seeing conditions. The central hole is the shadow of the secondary mirror. Cassegrains perform poorly is that even a slight miscollimation of an scts optics can.
My 8se showed perfect concentric circles all centred on the crosshairs. How to load a custom tune to the x4livewire tsitsxtsx. While we do not yet have a description of the sct file format and what it is normally used for, we do know which programs are known to open these files. Disassembly, transport, and other adjustments to scts may result in gross miscollimation, where no classic doughnut is available to help in the adjustment process. Metaguide allows me to obtain sub2 fwhm stars with a celestron cge and 11 sct at 2800mm f. Basically, precise collimation is somewhat less critical for observing dsos but extremely critical for planetary observing. The only thing is, it is an expensive bit of kit, and once you are happy, it.
Click add files and select the files you want to include in your pdf. Defocus a lot until you have what looks like a round globe or blob of light with a dark center. With your device connected to the pc click load custom tune file button in sct device updater to begin. File extension sct simple tips how to open the sct file. Just got one of these to help collimate my refractors. I bought a new schmidtcassegrain telescope sct recently. Tape the paper target that came with your collimator up on a wall at a distance that corresponds to slightly more than your telescopes close focus.
Modification of rear sct casting and installation of filtered cooling fans. Collimation is a normal part of the maintenance of all telescopes, and is not difficult if. Experienced sct users will tell you that the first step in collimating your scope is to understand why it is important by reading thierry legaults collimation page look at the astrophotography on his web site he very much knows whereof he speaks. To your query maksutovs can look quite confusing regards collimation. It is compatible with the 8 and 36cm roweackermann schmidt astrograph rasa models, and the celestron 7. If too loose, gently pull out the collimator and repeat step 2b until you feel the insertion is snugly fit into your focuser. Its a bit of an iterative process that gets tiresome going back and forth between the ep and the corrector to dial in the collimation. Slide the collimator into the focuser and feel if the adapter is tight during the insertion. Page 1 of 14 a tribahtinov mask for sct collimation and focusing posted in. After the install process completes, connect the tuner and follow the directions in the attached. The sct or scitex continuous tone ct format is associated with bitmap images created or edited on equipment produced by scitex. Schmidt cassegrain telescope advice maintenance sct.
I am an optical engineer by trade and a newbie amateur astronomer. If you have already installed the software to open it and the files associations are set up correctly. However my 6se did not the circles only partly overlapped and were off centre. Sct extension are known as windows script component files. Sct with a simple text editor like windows notepad will allow us to see some of the data encoded in the file. These telescopes can usually be collimated accurately using an optical aid or laser collimator. It is designed to make it easy to create template driven static or dynamic websites. The key is an accurate and low latency centroid that can be chased aggressively to overcome gearbox and bearing noise.
We strive for 100% accuracy and only publish information about file formats that we have tested and validated. Collimating an sct is almost never done under ideal conditions. A tribahtinov mask for sct collimation and focusing equipment. How to correct flares and sharply focus on my telescope.
The celestron edgehd is an advanced, flatfield, aplanatic series of telescopes designed for visual observation and imaging with astronomical ccd cameras and. The manual gives detailed information regarding each step as well as needed reference material and helpful hints guaranteed to make your observing experience as simple and pleasurable as possible. A question about telescope collimation optics lab tips. Ive never tried a collimation tool, but ive heard some say they arent very effective because of the folded light path of an sct. The difference between a collimated and an uncollimated sct, especially on the.
Consequently, collimation is at least 4 to 5 times more accurate. Orient your scope so its easy to reach the collimation screws. Mirror shift in an sct is a byproduct that occurs because manufactur ers sometimes choose to focus by moving the primary mirror. The advanced ct laser collimator brings the collimating star to your telescope within arm reaching distance.
See the list of programs recommended by our users below. This as the secondary has no adjustmentscrews like its cousin, the schmidtcassegrain sct. Laser collimation for schmidt cassegrain telescope. Now, backyard astronomers have an alternative to achieve excellent collimation conveniently using the advanced ct laser collimator. Coincident with our crusade, a small sct collimation cottage. With its shortrange capability, you can perform collimation indoors day or night without being subjected to weather conditions.
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