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Celestron 93648 Ghidaj de lux în afara axei (negru)

Brand:Celestron

3.3/5

L
2679.17

Ghidajul în afara axei este un accesoriu esențial pentru astroimagini pentru telescoapele cu distanță focală mare care necesită cea mai precisă ghidare posibilă. Celestron Off-Axis Guider folosește o prismă pentru a intercepta o mică parte a planului focal al telescopului (în afara câmpului vizual al camerei principale de imagine) pentru a localiza o stea ghid. Orice mișcare văzută de steaua ghid va fi exact aceeași mișcare văzută de camera de imagine. Ghidarea în acest fel va corecta erorile de urmărire, precum și erorile opto-mecanice sau îndoirea. Rezultatul: astroimagini mai bune cu stele rotunde precise. Ghidatoarele în afara axei există de mult timp, dar de obicei prezintă trei provocări principale:1 Găsirea unei stele ghid de la marginile îndepărtate ale planului focal al telescopului poate fi dificilă, având în vedere mic câmp vizual și, uneori, iluminare mai puțin decât ideală.2 Obținerea atât a camerei de imagistică, cât și a autoghiderului pentru a se focaliza între ele necesită mult timp și, uneori, necesită experimentare.3 Distanțiere și adaptoare suplimentare sunt, de obicei, necesare pentru camera, telescopul și ghidajul automat. , ceea ce sporește costul și complexitatea. Ghidajul în afara axei Celestron abordează aceste provocări prin:1 Furnizarea unei prisme mari de 12,5 mm care poate fi ajustată pentru a se apropia de centrul planului focal al telescopului, în funcție de dimensiunea camerei de imagistică. Acest lucru are ca rezultat stele de ghidare mai strălucitoare, cu ajutorul prismei mari pentru a ilumina complet senzorul de ghidare automată.2 Dispunând de un focalizator elicoidal de înaltă calitate, cu orientare fixă. Acest lucru asigură o focalizare extrem de lină și precisă a autoghiderului fără a schimba (sau răsuci) orientarea camerei autoghider.3 Incluzând toate distanțierele și adaptoarele necesare sunt incluse pentru cele mai obișnuite configurații de imagine, inclusiv camere DSLR, camere Nightscape CCD și multe altele. Sunt incluse următoarele adaptoare: SCT/EdgeHD, mamă M48, mamă M42 (filet în T), tată M48, tată M42 (filet în T), 3 distanțiere pentru filet în T Specificații suplimentare Cursarea focalizatorului elicoidal: 8 mm Conexiune telescop: M42 filet în T, M48 , și Conexiune SCT/EdgeHDAutoguider: filet M42 T și adaptor standard 1,25 Conexiune cameră: filet M42 T și M48

Nu există unități disponibile

EAN: 0780746999652

Categorii Electronică, Camere și fotografii, Binocluri și lunete, Telescoape, Catadioptrice,

Ideal pentru telescoapele Schmidt-Cassegrain și EdgeHD. Include adaptoare cu spațierea corectă pentru camerele DSLR, Nightscape CCD și alte camere populare pentru astroimagini. Diafragma clară de 48 mm acceptă camere full frame fără vignetare. Focalizare elicoidă cu orientare fixă ​​pentru focalizare automată ușoară, lină și precisă. Prismă multi-acoperită de 12,5 mm cu suport aluminiu pentru reflectivitate și iluminare maximă a autoghiderului. Cel mai precis mod de a ghida – precizie îmbunătățită în comparație cu utilizarea unui ghid separat.
Brand Celestron
Customer Reviews 4.3 4.3 out of 5 stars 87 ratings 4.3 out of 5 stars
Finderscope Reflex
Focus Type Manual Focus
Is Discontinued By Manufacturer No
Item model number 93648
Item Weight 0.96 Kilograms
Item Weight 2.11 pounds
Lens Coating Description Multi-Coated
Manufacturer Celestron
Model Name Deluxe Off-Axis Guider
Product Dimensions 16 x 16 x 9 inches
Telescope Mount Description alt-alt-mount

3.3

7 Review
5 Star
64
4 Star
17
3 Star
9
2 Star
4
1 Star
5

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Scritto da: Bill Allen
Great for SCT astrophotography - awesome product support
I like this product a lot. I didn't at first, but I purchased it for use in a Celestron SCT, since installing a guide scope on the side of the scope tended make the vertical balance in dec difficult (read: impossible) to achieve without adding additional weights to the scope to balance it. The Celestron OAG makes vertical balance in dec easy to achieve, because it keeps most of the weight of imaging and guiding cameras along close to the radial axis of the optical tube. The weight of a 9.25" SCT optical tube alone is about 20 lbs, which is within 2 or 3 lbs of the (actual) load limit of the Celestron AVX mount. I don't recommend AVX + 9.25" SCT, because if it is at all breezy, or one wants to add something like a filter wheel, one runs a significant risk of getting a bunch of astropix with unstackable content (elongated stars, with long periods of backlash recovery and jiggly star streams in several shots). I'm just saying that the OAG was the only way I was able to use the AVX + 9.25" SCT combo. I finally ended up getting a more robust CGX mount, which is 10 times the price of the OAG, but also I am now happy to have the OAG available, since it simplifies the weight and cable management of the mount. The hardest part of dealing with the OAG is when you first set it up, because you have to bring your imaging and guiding cameras to focus together. This can take a while as you work your way through the various adapters and combinations provided. Once this is done, though, it is possible to treat the whole conglomeration of OAG, imager, and guider as a single attachment for your telescope (just lock the focus of the guider with a set screw before disassembling), which is always at or near focus once it is attached. Saves a lot of time in the field. If you have more than one combination of telescope, imager, and guider that you want to use the OAG for, you either must go through the headache of parallel focusing the components, or, if you are wealthy (enough), I suppose you could get a dedicated OAG for each combination. Be careful when adjusting the height of the pick-off prism that relays some light to the guide camera. The prism can drop off, and getting it back on is a HUGE headache (Celestron allowed me to RMA mine when the prism dropped off, even though it was entirely my fault that this had happened; for this, they have earned a rating of totally awesome for life; they didn't have to honor the warranty, but they did). It turns out that the prism height was optimal to begin with, so that was a totally unnecessary adventure. One feature that this OAG has, which you won't find in most, is the ability to rotate the imager (and, separately, guide camera) very easily. Other things I like is the fact that it keeps the imager close to the guide camera. I use a ZWO camera that has a built-in USB hub, so I can attach the guide camera and filter wheel with two six-inch USB2 cables that run from the ZWO hub, which keeps everything neat and tidy, and easy to balance. All in all, this is a great solution for SCT deep-sky astrophotography. In retrospect, I believe the reason I didn't like the OAG when I first got it is that it required me to change a lot of preconceptions I had about the relationship and positioning of equipment on the mount. The fact that Celestron replaced the OAG that I myself had damaged brings my rating to 5 stars.
Scritto da: Marc Keith
Wow!
I've read a lot of horror stories about fiddly this and fiddly that and cant get focus and not able to get things working.... Opened box, attached to the back of my 35+ year old Celestron C8. 1. Threw an ASI178MM on the back, attained focus. 2. Stuck a ASI120MM mini in the off axis guide. Couldn't attain focus on the offset. 3. Added a 5 mil spacer (provide) between my 178MM and the OAF, re-attained focus. 4. 129MM attained focus (even with a light pollution filter screwed on the end). a) No adjusting prism, it is pre set. b) Offset Axis has a helical focuser, no rotation. c) Front and back thread attachments are removable (three thumb screws tighten/release) so you can attach (even replace with correct threads) them to the camera/scope, THEN attach to the off-axis guider. Saving you from catching it on the first bounce off the cement driveway when drop it with all your cameras attached. About 20 minutes of pottering about in total to get it to work.
Scritto da: JAG
Weird rate features - "warmth" and "thickness" w>?
besides those irrelevant ratings categories on amazon I like it very much, it's a substantial piece of equipment. double edged sword there - that means it's also heavy. with a lot of digging I found out it's 18 ounces. just over a pound - that information is not very freely advertised but if you're buying this in the first place you'll already know that the weight of the item is very important. It does have a lot of bells and whistles included for increasing your focusing distance and adapters for various threads, plus a top focus ring for your guider cam which is a very helpful inclusion vs trying to just set the cam in and out trying to match focus. I personally find the prism up to the guide a bit dim, but I guess that's to be expected from a diagonal. All in all I found it to be pretty solid, I had another off axis from a brand I can't mention that was pretty flimsy and difficult to focus and this was definitely a step up.
Scritto da: Linwood
Great big prism, works nicely
I use this on a C11 EdgeHD, with a full frame imaging camera. The prism for the guiding camera, relative to competitors, is very large and so it is much easier to find a guide star. It comes with a nice collection of adapters to the scope side and camera side (though it should come with a wider 3.28" scope side adapter, that Celestron now sells separately). It is also easy to rotate the camera (guide and imaging) separately, or collectively, by loosening a couple screws. On the downside -- adjusting the prism position (how far down into the frame) is rather tedious. Not hard, just tedious. Fortunately you should have to do it only once. The other downside - partly because of all the other features -- is that it adds quite a bit of backfocus, which may be an issue on some SCT's especially if you want separate focus, filter wheels, etc. But overall, well built and does what it should.
Scritto da: John A. Rescigno
Not for all scope / camera combinations
My guider also had a broken set-screw; I contacted Celestron and they offered to replace it immediately, however the way I will be using my guider will be by screwing it on directly, and not using the nose-piece. The set screw is only for the nose-piece. So ultimately no problem there. I have the NexStar 8SE and this guider is absolutely perfect for this scope. It comes with a great selection of adapters and is surprisingly easy to use with this scope. I also have the 80ED, a lovely refractor. You can use this OAG with this scope (and a Canon T3i on the other end) ***but you cannot use the very necessary field flattener!*** because the guider it just a little too thick. I am considering one of the very thin OAGs for my 80ED but the reviews on them are horrible. Overall this is a very well made (other than one set screw apparently) product that is very easily adaptable to a great many astrophotography solutions - but not all of them.
Scritto da: JGB
Excellent product.
Quality product and delivered quickly. Very helpful with long focal length astrophoto guiding.
Scritto da: Adam Vorous
Love it.
I bit pricey, but comparing to other options this is by far a good bang for your buck! Very good quality components and the prism is larger than competitors! I’d recommend!

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