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iOptron 3330 scope for Sky Tracker
This scope is part of usual kit iOptron sells with portable smaller sky trackers such as 3302B or 3302W.
Model number is 3330.
It is used to set the polar alignment more accurately and mostly useful when you use a longer focal length lens on camera that is used on the tracker (Say anything above 50mm and definitely 135 or 200mm or when you have very lengthy period of exposure (2 minutes or longer) when using a wide angle lens.
Typically the north star that is to be used for polar alignment in Northern hemisphere, though supposed to be stationary with naked eye, makes a tiny relative circular motion, with time. The internal reticle has circles clearly marked (Like an analog clock) corresponding to this path, that when combined with smart phone or PC App, time of night and your GPS location, can give you the exact location of North star over this circle. You simply move the tracker so you have Polaris in needed location, as shown on app for the time and location (Mostly as displayed on app with no need of upside down image correction), then keep the tracker firm and with no further move or shake so that for the rest of night, it can accurately track the sky (Avoid star trails that are otherwise visible as an artifact and distraction/distortion in your image).
It can be installed only in one direction due to its construction, so easy to get it in place right.
Optics are good and clear.
Has a red internal illumination. If you are color blind to red, you may contact iOptron and they may change the LED color to green or something that is better visible to you. A friend did it for free (Only paying shipping).
There is two focusing rings, one for the object at infinity (Polaris) the other for reticle, to see both clear. Best to focus correctly in daytime.
Make sure not to remove it from your tracker as this lead to losing it, as in my case, thus making it necessary to buy one on ebay and must tell you, it is not that easy to find one of these otherwise.
Cons: Actually minor.
- Illumination light is dim and has no intensity control (Tracker related).
- Higher location of scope on tracker, makes it easier to be obstructed by camera attached to tracker so re-verification of alignment in mid night can be hard, necessitating to move the camera off the target.
- iOptron does not provide App (That is cheap) for free, in the kit with the tracker.Vollständige Rezension lesen
Bestätigter Kauf: Ja • Artikelzustand: gebraucht • Verkauft von: archaelon1
Works As Stated
This is a simple device but both the panning base, panning mount & alt adjustment are pretty crude. So when you get polar alignment & try to lock everything down, you fall off your alignment. Takes several tries to get it well aligned. But once your aligned, it tracks well.Vollständige Rezension lesen
Bestätigter Kauf: Ja • Artikelzustand: gebraucht • Verkauft von: switters69