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Thread: Removing AR 102 dewshield.

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    Default Removing AR 102 dewshield.



    Hi.
    Just a simple question:
    Has anyone ever removed the dewshield on an AR 102?

    I presume it's screwed on, and I've tried unscrewing it with as much pressure as I dare, but it won't budge.
    Any trick to it or is it just a question of applying the necessary force?

    Thanks
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    Default Re: Removing AR 102 dewshield.

    I haven't removed mine, but it's the same as my AR152, which I have removed. Believe it, or not, it just pulls straight off. It's on there pretty snug, though. They put pieces of sticky-backed felt at a few spots around the outside diameter of the tube, which bring about that snugness.

    Just be very careful and don't let physics get the best of you! I'd hate to see it break free and you sling the dew shield across the room, or Heaven forbid, the OTA!

    BTW, it's not so easy to get back on either...

    ar152_felt_strip.jpg
    Last edited by exparrot; 10-22-2012 at 10:49 PM.
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    Jerry
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    Default Re: Removing AR 102 dewshield.

    Thanks Jerry,
    You confirmed what I was kind of thinking, and I'll keave well enough alone.

    I just wanted to see what the OTA looked like without it, and I can stand not knowing.
    It seems like one of those situations that if I try it, it'll never be as snug as it is again.
    And not having a good reason to do it, I'll just leave it.

    But I'm still happy to know how to remove it should need ever arise.

    Thanks a lot.

    PS (Edit) I hadn't noticed the picture that came with your post. Now I DO know what the OTA looks like without the dewshield. (Makes me kinda glad I didn't try it!). But in the unlikely event that the front cell should ever need collimation, I'll now be better prepared.
    Last edited by Voyager3; 10-22-2012 at 11:04 PM.
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    Default Re: Removing AR 102 dewshield.

    Good question there V3
    I was wondering that myself. I didn't want to force anything and now I'm glad I didn't try.
    I'll leave well enough alone also...I'd HATE to "Bobble" it!
    Thanks for the heads-up there Jerry

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    Default Re: Removing AR 102 dewshield.

    Happy to help! I'll never take mine off again, unless I need to collimate it (for some bizarre reason). It's too scary! Although, if I could find a longer dew shield for the AR102, I would remove it to replace it. I'm just not a fan of that short, stubby dew shield.
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    Default Re: Removing AR 102 dewshield.

    If its like the ED102, doesnt it just come off with two thumb screws? As for the velcro, I align the two screws on to the two metal flat spots so that they don't chew up the velcro.
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    Default Re: Removing AR 102 dewshield.

    Removing the shield is not a problem. I have the AR127, and it just pulls off. It certainly is a snug fit, as it needs to be to hold it in place, but certainly can be removed. I just grab the OTA handle with one hand and the end of the shield with the other. There are three contact points that it fits against near the objective. As I pull it, it can come off a little unevenly, so I just grab it at another point around its circumference and pull to even it out. After a few pulls it comes free. Putting it back on, you just need to make certain that you get it positioned squarely so it slips back into place evenly around its circumference. I put it in place them push at one point around the circumference, then move my hand to another position along the circumference to push. Keep doing that will make certain it seats evenly against the end of the OTA.

    I've removed mine multiple times both mounted on the Twilight or unmounted. Additionally, I removed it to flock the inside of the shield. I butted the flock up against the rubberized ring that fits around the outer edge of the shield and in to a point just shy of the three contact points that hold the shield in place on the end of the OTA. There really shouldn't be any concerns about sending either the shield or OTA flying across the room as long as you keep a firm grip and don't try to just rip it off. I do it slowly, but firmly.
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    Default Re: Removing AR 102 dewshield.

    Thanks Jerry.

    The only time I was curious as to how it came off was when I initially got mine and discovered there was no instruction booklet with it. For example it was soon after I got my AR102 that I found out that on the focuser the small screw is the focuser tube lock down screw whereas the large screw is the tension screw.......oh well, live and learn
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    Default Re: Removing AR 102 dewshield.

    Quote Originally Posted by AbbN View Post
    Thanks Jerry.

    The only time I was curious as to how it came off was when I initially got mine and discovered there was no instruction booklet with it. For example it was soon after I got my AR102 that I found out that on the focuser the small screw is the focuser tube lock down screw whereas the large screw is the tension screw.......oh well, live and learn
    Hey, Abb

    I haven't actually tried removing the shield on my AR102, but I tugged on it and can tell it's tight. My AR152 was a little bit of a struggle. The tube is so heavy and long, it's hard to get a secure hold on it, so you can work the shield loose in the manner described previously by Alan. However, that's the best way and it will eventually work loose. Of course, I was exaggerating a little about exerting too much force and accidentally flinging it across the room, but the design can make for a pretty snug fit (at least it was in my case).

    Yes, a User's Guide would be nice, even if it was just a couple of pages. I ended up downloading the only document they provide on their website, for the APO series, and it discusses the two screws on the focuser. I guess trial and error would have enlightened me, too, but that was my first refractor and I really didn't know about tension/lock screws.
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    Default Re: Removing AR 102 dewshield.

    Hi Jerry,

    I never noticed that guide for the APO series before. I did look for something on their website when I got my AR102 in late January but found nothing so this guide you mentioned must have been put on there after that. I found out about the two screws in another forum.

    Thanks for mentioning it - heading to their site now
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