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Who needs the corrector?
The effect of atmospheric dispersion strongly depends on the elevation (height) of the object observed appears in the sky. The lower the object is in the sky, the longer the path its light takes through the atmosphere and hence the greater the dispersion produced. The bright planets in particular are not often very high in the sky, especially if you live at high latitudes. The ADC lets you observe planets, not only when they are high in the sky but even when rising and setting, with high brilliance and colour and without chromatic aberration. This makes you much more flexible in your choice of observing time.
Three eyepiece holder thumbscrews, which make the connection more firm, more stable and more convenient to use.
Improved attachment design features a brass clamping ring which provides your eyepieces with optimum protection from scratches or deep grooves, and provides a more secure connection.
Thread for 1.25'' standard filters, use with a filter to watch the moon for better images. Effectively reduce stray light interference, the edge details of the image are clearer.
There is a small spirit level at the top of the atmospheric dispersion corrector to better find the zero position of the ADC.
Customer
Reviewed in Mexico on July 2, 2024
Excelente producto, y me llegó muy rápido, gracias!
SCOTT
Reviewed in the United States on September 9, 2021
I was hot for a quick ADC, and Astromania/Amazon delivered in a few days, which was hot.Also hot was seeing more clearly defined cloud bands on Jupiter on a 100mm scope. Whee!What's not hot is losing the eyepiece screws in the dark, because they fall out and there are three of them (why?) which makes it easy to lose track of which ones you've unscrewed a bit and which not. This is exacerbated by the eyepiece retaining ring, which doesn't like to release the eyepiece. Bug? Feature? NIGHTMARE!With Televue things you never have this problem because the screw has a stop on it and there's only one of them anyway. I have no idea if the ADC competition from ZWO/ASI has this issue.There aren't any instructions on how to use it, so I had to dig those up and experiment a bit. Short answer: the long arms should be open the same distance from the screw.The level is only useful for optical systems where the horizon is... horizontal! The rotation gets tricky once you involve a diagonal. On my fully-corrected prism diagonal on a refractor it seemed to work best 45 degrees clockwise from vertical. Also, it's only relevant above f/16 or so, meaning it will be more relevant with a Barlow or powermate.
matthew O'Malley
Reviewed in the United States on July 27, 2020
Comes with a bubble level, which I did not expect. Definitely a welcome surprise. Actually seems much higher quality than I expected, nice 3 screw compression ring, threaded for a zwo size camera, seems very solid. Have not tried it out yet but it arrived on time and in brand new condition.
Daniel
Reviewed in the United States on December 4, 2020
The ADC came with NO instructions at all. I checked their website and I was unable to find any useful information. My problem was that no matter what I tried the pictures in the telescope would come with a distortion or like out of focus. I tried adding a 2x barlow in-front and then behind the ADC but no matter what the image would not be clear or focus as when not using it at all. I am using an 8 inch SCT telescope with a zwo asi camera.I did not try visual observing.I returned the product.
AMorales
Reviewed in the United States on November 13, 2020
Came with bubble level. Nice
Erik Marsh
Reviewed in the United States on October 22, 2020
This works well enough, mine came with an empty bubble level, you can still use it without it and the product does what it is meant to do, but it is an indicator of poor overall quality. In addition some of the optical elements seems loose inside but I don't know it its supposed to be that way or not.
astrowxtrainguy
Reviewed in the United States on September 7, 2019
I picked up this atmospheric dispersion corrector (ADC) to help with my planetary imaging. Saturn is low in the sky this year where I live and except for where it is crossing the Meridian and at its highest point there is noticeable atmospheric dispersion present when imaging with my Canon SL2. This corrector helps with that but it does have a couple drawbacks that can limit its usefulness. The biggest is that it significantly dims the image. So I have to image at a higher ISO which introduces more noise on the image. This isn’t a huge problem with Saturn since I can take a longer video to stack into a final image but it can be an issue with Jupiter since the faster rotation limits the length of video capture you can do so it is harder to offset the increased noise. I’m only shooting at 30fps so a higher frame rate camera would probably help. The other issue is that it can sometimes be a little challenging to adjust properly since it has to be oriented properly to work well and depending on your scope and mount that may mean adjusting it as you move the scope around since you need to have it oriented so the direction of the correction is perpendicular to the horizon. Plus you will need to adjust the correction if you look at another object higher or lower in the sky. The bottom line is that it does work but can add some extra hassle to your imaging process. It can help improve things a bit with color imaging of objects close to the horizon but probably isn't worth the hassle for imaging objects higher up since the dispersion is less anyway. I've attached two images of Saturn one with and one without the ADC used.
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