Deleted
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AP 27TVPH
Sept 1, 2014 1:59:24 GMT
via mobile
Post by Deleted on Sept 1, 2014 1:59:24 GMT
Hi,
I just got this AP TELECOMPRESSOR and was wondering if any had experience with it. The optic is designed for the AP 2.7 focuser and threads into the drawtube. It is a 2" lens. I was speculating on how to use it along with the various pieces of my Mallincam MFR5 or perhaps some cool DSO's in your experience to use this stuff on. It is a .75 device. I know that feedback could be tough to come by as you will have to own the specific focuser that is mostly found in AP OTA's only, but general theoretical comments are welcomed! Unfortunately, the Astrophysics user group is pretty much populated only by CCD folks, so results can be slim there on the astrovideo dialogue, haha.
TIA, Ross aka rossmon
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Post by Deleted on Sept 1, 2014 3:02:51 GMT
Hi, I just got this AP TELECOMPRESSOR and was wondering if any had experience with it. The optic is designed for the AP 2.7 focuser and threads into the drawtube. It is a 2" lens. I was speculating on how to use it along with the various pieces of my Mallincam MFR5 or perhaps some cool DSO's in your experience to use this stuff on. It is a .75 device. I know that feedback could be tough to come by as you will have to own the specific focuser that is mostly found in AP OTA's only, but general theoretical comments are welcomed! Unfortunately, the Astrophysics user group is pretty much populated only by CCD folks, so results can be slim there on the astrovideo dialogue, haha. TIA, Ross aka rossmon Hi Ross,
I have a similar device for a Takahashi APO which is nearly 3" in dia. Mine converts an f/8 scope to an f/6 with still the same pin point stars. This sort of high end telecompressor optics are designed to work with the front objective to give the same high quality final image with no degradation. Mine cost me $700 and that was about 15 years ago. I must admit I would not be inclined to mix & match such optical units and making adapters to do so may well gain very little. However, if you have the time & materials and no risk of doing any damage to the AP optic, well it is an experiment.
Clear skies... Shevill
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Post by Dragon Man on Sept 1, 2014 7:37:06 GMT
Hi Ross, yes, I have that exact Telecompressor. I find it to be of extremely high quality. As a Focal Reducer it doesn't achieve much reduction but it's usable. It gives a Focal reduction of 0.75x I have the AstroPhysics 2.7 Focuser on my 6" f/5 refractor, and after several attempts to get the Telecompressor to work with other focal reducers Focus was very hard to achieve. I decided to not use it in partnership with others, and just stick with it alone or my 0.58x focal reducers alone. Here are some Screen Grabs from my Live Broadcasts when using the AP Telecompressor: Abell 1367 Keyhole Nebula in Carina Nebula M83 M42
So, as you can see, it gives pretty good views. But I personally prefer a wider FOV so I don't use my Telecompressor very often. I prefer using my home made 0.58x Focal reducer.
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Deleted
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AP 27TVPH
Sept 1, 2014 8:10:09 GMT
via mobile
Post by Deleted on Sept 1, 2014 8:10:09 GMT
Cool, thanks Dragon Man, for the shots, now I have a reference for when I go for those objects! As you can see by the time I'm up and out in front of my gear right now, but no telecompressor, using my mfr5. Are u using an ap scope or something else? I am married to my 155EDFS for the foreseeable future!
Clear Skies,
The Rossmon
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Post by Dragon Man on Sept 1, 2014 10:11:27 GMT
No Ross, my AstroPhysics 2.7 Focuser is on a Skywatcher 6" f/5 Achromat. Quite a cheap scope for their size, if you can find them. And if you can tolerate an Achromat. Here it is with Telecompressor fitted and Samsung SCB-4000 (SCC-A2333) camera inserted:
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