· Get a Cloudy Nights T-Shirt · Submit a Review / Article Click here if you are having trouble logging into the forums Privacy Policy | Please read our Terms of Service | Signup and Troubleshooting FAQ | Problems? PM a Red or a Green Gu… uh, User You are not logged in. [Login] Entrance · Main Index · Search · New user · Who's Online FAQ · Calendar Equipment Discussions >> Binoculars Previous   Index   Next   Threaded   Pages: 1 | 2 | 3 | 4 | (show all) Umesh member Reged: 11/06/10 Loc: India Re: Issues with Celestron skymaster 15x70 Binoculars [Re: JasonBurry]       #5237116 - 05/24/12 11:39 AM Edit   Reply   Quote Quick Reply   Hello Jason, I usually don't wear eye glasses or contacts, only when i sit down to read for longer periods i put one glasses, BTW my eyes are -0.75, so am guessing that should not be a problem i also have a skymaster 15x70 which is well collimated and i have no issues whatsoever in focusing there. About running out of in-focus, you might be right, but it's with one of the barrels though, am not very sure, will confirm my findings tomorrow. Best Regards, Umesh Post Extras:       BillC on a new path Reged: 06/04/04 Loc: Lake Stevens, WA, USA Re: Issues with Celestron skymaster 15x70 Binoculars [Re: EdZ]       #5237141 - 05/24/12 11:57 AM Edit   Reply   Quote Quick Reply   I once saw a GALAXY 7x50 with one objective recessed 3/8 to 1/2-inch more than the other. Meaning, the objectives weren't matched in FL. They didn't care; someone BOUGHT it, didn't they? BillC Post Extras:       chuck56 sage Reged: 01/21/07 Loc: Chicago, Illinois Re: Issues with Celestron skymaster 15x70 Binoculars [Re: EdZ]       #5237285 - 05/24/12 01:18 PM Edit   Reply   Quote Quick Reply   Why don't you unscrew both barrels and hold them up to a bright light and hold them side by side to see if they look alike. Can't hurt. Post Extras:       chuck56 sage Reged: 01/21/07 Loc: Chicago, Illinois Re: Issues with Celestron skymaster 15x70 Binoculars [Re: Umesh]       #5237344 - 05/24/12 01:44 PM Edit   Reply   Quote Quick Reply   Unmesh When you say both images are exactly vertical do you mean they are across from one another? Post Extras:       GlennLeDrew Postmaster Reged: 06/18/08 Loc: Ottawa, Ontario, Canada Re: Issues with Celestron skymaster 15x70 Binoculars [Re: chuck56]       #5237466 - 05/24/12 02:44 PM Edit   Reply   Quote Quick Reply   By running the collimation screws so far as to noticeably affect the exit pupil shape might have been too aggressive to start. But if you've only been fiddling with one side thus far, no problem. However, if you've been making adjustments to both sides, and somewhat 'willy-nilly" at that, there's a chance both sides are now internally mis-collimated more than need be. When doing a conditional alignment, I try to see which side has the best internal alignment and image quality, and then start with small adjustments to the other side. If on the side I'm adjusting its internal alignment and/or image seems to suffer more as a result, I'll then move over over to the 'good' side and iteratively adjust both (in baby steps), striving for a balanced degree of internal alignment on both barrels once collimation is achieved. Again, this is only when I'm concerned with achieving a conditional alignment for my IPD only. Post Extras:       Umesh member Reged: 11/06/10 Loc: India Re: Issues with Celestron skymaster 15x70 Binoculars [Re: chuck56]       #5238546 - 05/25/12 08:29 AM Edit   Reply   Quote Quick Reply   Hey Chuck, What i meant was that one image appears to be below the center of FOV and the other one above the center. Umesh Post Extras:       Umesh member Reged: 11/06/10 Loc: India Re: Issues with Celestron skymaster 15x70 Binoculars [Re: GlennLeDrew]       #5238559 - 05/25/12 08:48 AM Edit   Reply   Quote Quick Reply   Hello Glenn, I agree, i was too aggressive on the collimation screws on both sides and it did change the exit pupil which was circular to begin with to cat's eye shape. I have managed to bring it back to circle now. After lots of frustration and a mild head ache i think the image quality has improved, though the image is almost merged the outer zones seem soft, and the central part of FOV is coming into good focus with good sharpness and also the double image effect is very minimal. Don't know if that really means anything, because i have observed that what you are seeing or perceiving can change after taking a long break, will be able to confirm only after a little while, I hope it's not as bad as it was yesterday. BTW I found this link searching on google relating to collimation of 15x70 Binocular. http://observers.org/tac.mailing.list/2008/Jan/0038.html Umesh Post Extras:       JasonBurry sage Reged: 04/27/12 Loc: Cape Spencer, NB, Canada Re: Issues with Celestron skymaster 15x70 Binoculars [Re: Umesh]       #5238630 - 05/25/12 09:30 AM Edit   Reply   Quote Quick Reply   Well, that's positive at least. FWIW, in my own pair (which luckily were in decent order when purchased), the view is sharp for all but the outer 10-15%. With my nearsightedness at about -4, I've very little in-focus remaining, especially as the diopter is also adjusted 3/4 of the available - side. J Post Extras:       Umesh member Reged: 11/06/10 Loc: India Re: Issues with Celestron skymaster 15x70 Binoculars [Re: JasonBurry]       #5240530 - 05/26/12 11:36 AM Edit   Reply   Quote Quick Reply   Finally, i have merged image, i tested it on the moon just now, moon looks fantastic. Tested on stars, there is a slight deformity in the shape of stars, it is almost like a point but with very mild distortion. what a relief! Post Extras:       Umesh member Reged: 11/06/10 Loc: India Re: Issues with Celestron skymaster 15x70 Binoculars [Re: Umesh]       #5241463 - 05/26/12 10:48 PM Edit   Reply   Quote Quick Reply   Update: I consider the collimation problem to be fairly resolved, not perfect but usable, I will leave this at at. Thank you everybody for pitching in and sharing your experiences and guiding me in this issue. Best Regards, Umesh Post Extras:       saemark30 scholastic sledgehammer Reged: 02/21/12 Re: Issues with Celestron skymaster 15x70 Binoculars [Re: Umesh]       #5250718 - 06/01/12 04:20 PM Edit   Reply   Quote Quick Reply   Are the Bushnell Astralius 15x70 binoculars any better? Some thick it is optically. Post Extras:       saemark30 scholastic sledgehammer Reged: 02/21/12 Re: Issues with Celestron skymaster 15x70 Binoculars [Re: saemark30]       #5254814 - 06/04/12 02:54 PM Edit   Reply   Quote Quick Reply   Where are all the collimation screws for the prisms? I can find 2 under near the eyepiece end, just lift the rubber covers. Post Extras:       JasonBurry sage Reged: 04/27/12 Loc: Cape Spencer, NB, Canada Re: Issues with Celestron skymaster 15x70 Binoculars [Re: saemark30]       #5254867 - 06/04/12 03:47 PM Edit   Reply   Quote Quick Reply   Look at the prism housings of the binocular. You'll see that a rubber piece wraps around each (this example for the right barrel) from about 11 o'clock to about 10 o'clock, with a small amount uncovered adjacent the focuser wheel. One screw is under the rubber at about 1 or 2 o'clock, near the eyepiece end. The other is at about 10 o'clock, under the little tab of rubber that extends up from beneath, adjacent the focuser wheel, near the front (objective end) of the prism housing. J Post Extras:       saemark30 scholastic sledgehammer Reged: 02/21/12 Re: Issues with Celestron skymaster 15x70 Binoculars [Re: JasonBurry]       #5256497 - 06/05/12 04:59 PM Edit   Reply   Quote Quick Reply   A picture of the prism collimation screw locations would be helpful. Thanks Post Extras:       JasonBurry sage Reged: 04/27/12 Loc: Cape Spencer, NB, Canada Re: Issues with Celestron skymaster 15x70 Binoculars [Re: saemark30]       #5257656 - 06/06/12 07:54 AM Edit   Reply   Quote Quick Reply   Sadly, no camera or binos at hand right now. Google Images. "Celestron Skymaster prism screw locations". You'll see'em. J Post Extras:       lionel sage Reged: 08/12/07 Loc: Delaware Re: Issues with Celestron skymaster 15x70 Binoculars [Re: saemark30]       #5258431 - 06/06/12 02:08 PM Edit   Reply   Quote Quick Reply   Here is a link to instructions for correcting slight miscollimation with a photo of screw locations. Worked well to correct my new 15x70 Skymasters which were slightly out of collimation when I got them. http://www.oberwerk.com/support/collimate.htm Post Extras:       saemark30 scholastic sledgehammer Reged: 02/21/12 Re: Issues with Celestron skymaster 15x70 Binoculars [Re: lionel]       #5258689 - 06/06/12 05:00 PM Edit   Reply   Quote Quick Reply   I've seen those instructions. It's the screws near the focuser that ellude me. I'll have to peel the rubber offer to find them. Post Extras:       EdZ Professor EdZ Reged: 02/15/02 Loc: Cumberland, R I , USA42N71.4W Re: Issues with Celestron skymaster 15x70 Binoculars [Re: saemark30]       #5258803 - 06/06/12 06:13 PM Edit   Reply   Quote Quick Reply   this article has photos of both locations http://www.cloudynights.com/item.php?item_id=416 edz Post Extras:       saemark30 scholastic sledgehammer Reged: 02/21/12 Re: Issues with Celestron skymaster 15x70 Binoculars [Re: EdZ]       #5260211 - 06/07/12 01:49 PM Edit   Reply   Quote Quick Reply   Has anyone taken the back lids off to get to the prisms? I suppose some flocking would help with reflection problems. The 2 front lens barrels should screw apart from the body. Post Extras:       JasonBurry sage Reged: 04/27/12 Loc: Cape Spencer, NB, Canada Re: Issues with Celestron skymaster 15x70 Binoculars [Re: saemark30]       #5260264 - 06/07/12 02:25 PM Edit   Reply   Quote Quick Reply   I have removed the prism covers on other binoculars. No flocking will help with ghost image reflections, these are produced by un-coated or poor coatings on the prisms. Not reflections within the prism housings proper (since the prisms rely on total internal reflection, there is no light escaping them to cause this). The objective barrels do indeed screw off the body, as do the eyepiece guide tubes. You should probably not remove them. If one were to flock or paint inside a bino, the most profitable place to do so would be inside the objective barrels (I notice that my Skymaster barrels are not that flatly painted). I've had good improvements on another bino by blacking the edge of the eyepiece field lens with sharpy. I didn't do the eye lens doublet for fear of the marker dye penetrating into the cement. The difference (I did one eyepiece only at first) was marked. J Post Extras:       Pages: 1 | 2 | 3 | 4 | (show all) Previous   Index   Next   Threaded   Extra information 7 registered and 41 anonymous users are browsing this forum. 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