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peterstrapp

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About peterstrapp

  • Rank
    Vacuum

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  • Gender
    Male
  • Location
    North Wales
  1. peterstrapp

    TS 65Q vs ZS71 ED 2013

    I came across a post by Yarosia last night that shows a TS65Q used on a Star Adventurer. It does appear that it can be mounted using a dovetail bar with a 1/4 inch thread, though only the back portion of the bar would be in contact with the mount. http://stargazerslounge.com/topic/215957-skywatcher-star-adventurer/page-2#entry2407676 He's had some success which resulted in a nice image of the north american nebula, however he had to throw away a lot of subs with non-round stars. I spent last night researching lenses. There are very few options for the price of an TS65Q. The 200mm 2.8 L is interesting but even the largest objects would appear quite small using it. I have an old low quality 70mm - 250mm lens that I tried on the mount last night (through the clouds). Wobble from the mount is extreme even at 250mm, there's night and day between this and my HEQ5. I'm starting to think I'm expecting too much from it. I think getting an object lined up in the frame at 420mm (65Q) would be quite a task. And I'm really starting to doubt whether round stars would be achievable without a lot of luck.
  2. peterstrapp

    TS 65Q vs ZS71 ED 2013

    Olly, your right, it is a quad, I listed it as a triplet with flattner as an easy way of comparing it against a doublet with flattner. That may be under-selling it though, as you say, being a quad it takes away the hassle of a separate flattner. nmoushon, unfortunately the ED80 weighs around 4kg. The SW Adventurers limit is 5kg (I assume this includes counter-weights). Alan, oops, yes that should be 2.9kg. I am a bit concerned about weight. I wonder whether I could attach a 3.5kg object to the mount to test it's capacity before shelling out on the scope.
  3. I'm trying to decide between these two small telescopes to add to my portable setup. I'm hoping to mount it on my new SkyWatcher Adventurer mount. The mount seems capable of carrying a scope of this size (Lacerta 72mm APO - http://www.astronomieforum.at/viewtopic.php?f=4&t=8327). Having trawled the forums and various sites for weeks this is what I've leart: TS 65Q Apature 65mm F6.5 FPL53 glass Triplet Integrated full frame flattner Vixen dove tail bar (£20 extra) Standard finder shoe Weight 1.8kg 2-inch to T2 extension tube needed for connection to DSLR (£20 extra) £540 Known issues: Potential astigmatism problem when cold (fixable by slackening lens), ZS71 ED 2013 Apature 71mm F4.72 (with reducer/flattner) Doublet FPL51 glass Seperate APS-C frame flattner Very short intergrated dovetail bar No finder shoe Weight 1.9kg (with reducer/flattner) T2 connection on reducer/flattner £460 Known issues: Short dovetail can make it back heavy Blue star blooming Potential slop in rotatable focuser The WO ZS71 has greater apature and is faster but is a doublet with lower quality glass (more prone to blue star blooming). The 65Q can suffer from an astigmatism problem and is £80 more but seems to handle blue stars well and I've seen some stunning flat images from it: http://maximusphotography.files.wordpress.com/2014/02/m-22.jpg http://maximusphotography.files.wordpress.com/2014/02/m-11.jpg This recent review indicates that the astigmatism issues of 2011 are now cured: http://www.nightskies.net/scopetest/scopes/telescope_service/apo65q.html I'm leaning towards the TS 65Q but would like to know others thoughts. Without a push in one direction or another I'll likely roam the internet researching scopes for months to come. Thanks, Peter.
  4. peterstrapp

    Time for mirror re-coating?

    I'm itching to try it out but predictably, after a few weeks of beautiful sunshine, the storm clouds have rolled over for the weekend. I'm hoping that the combination of a re-coated mirror and the telescope being auto collimator aligned for the first time will result in some improved pics though.
  5. peterstrapp

    Time for mirror re-coating?

    I've received the mirrors and they look flawless! It took two weeks, just as Galvoptics estimated. I didn't have any trouble getting in touch with them by phone and they were friendly. Now I just have to find the centre of the mirror and affix a Catseye Hotspot. If anyone has any suggestions on how best to accurately apply the sticker please let me know. So far the plan is to use the template that came with the Hotspot, however, I have read that this method may not be accurate enough for the auto collimator. Peter.
  6. peterstrapp

    Time for mirror re-coating?

    I decided to send the mirrors down to Galvoptics in Essex. I'll report back when I receive the re-coated mirrors.
  7. peterstrapp

    Time for mirror re-coating?

    I didn't think the the glass was damaged however another member has just sent me a message including "fungus on glass can eat through coatings and etch the glass". I'm not so sure now. Hopefully it is just the aluminium that has degraded as a new mirror would be around €200 (it's f/4). Vacuum Coatings Ltd would be around £75. Orion Optics would be a bit over £100. I'll send some photos to both and ask for an evaluation.
  8. Hello, I'm looking for some advice on the mirrors in my 8" GSO telescope. The secondary looks quite bad. The primary has marks, mainly near the edges but is also covered in an orange/brown mottled pattern... as well as a surprising amount of dust and fur . Is it time to have the mirrors re-aluminiumised and over-coated? How bad have other people's mirrors become before having them re-coated? Did you notice much of a difference afterwards? I'm thinking of sending the mirrors to Vacuum Coatings Ltd but would like to know your thoughts before I do. Thanks, Peter.
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