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Thread: Replace red dot finder? Celestron Evolution 8

  1. #1
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    Default Replace red dot finder? Celestron Evolution 8



    I’m a newbie and I’ve been having difficulty finding things in my scope at night. I’ve only had my scope out a couple of times due to rainy weather, but it seems like part of my difficulty may be the red dot finder that is on the Celestron Evolution. I’ve read that it’s not very good and should be the first thing that someone upgrades.

    This afternoon I went out to align my scope and finder again. I focused on 3 silos which I estimate were about 1/2 mile away. I focused on the top of the middle silo and was able to get a good view with a lot of detail. However, when I tried to then align my red dot finder with what I saw in the scope I couldn’t quite do it. There did not seem to be enough play in the finder scope controls to get it properly aligned, I was “high and to the right” by about 15 - 20 feet. It seems like 15 - 20 feet off at 1/2 mile would equate to a huge difference when using the finder to align something at night. I took the finder off and reinstalled it, played with the screws as much as I could without striping the plastic threads, etc. I just could get it to align any closer.

    So my question is, am I doing something wrong, or is the red dot finder on the Celestron Evolution 8 just not very accurate? My wife just told me to replace the finder (she’s probably tired of hearing me complain) and I may do that, if the problem is not me. The next question is, replace it with what? I’ve read some positive stuff about Telrad finder scopes.

    Thanks for your thoughts and opinions!

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    Default Re: Replace red dot finder? Celestron Evolution 8

    Hi there I'm not familiar with your scope but my only guess would be do you have it back to front ? Im sure if it come with the scope it must work. It only has up and down and side to side adjustment the only answer must then be back and forth ? As Spock says : “When you eliminate the impossible, whatever remains, however improbable, must be the truth.”
    I have a love hate relationship with my red dot finder, I think its great because you can readily see the whole sky around it so you can see your target. But i constantly fumble with it in the dark and turn the wrong screws when turning it on and I always forget to turn the damn thing offf ...I got sick of getting on my knees to use it when the scope is looking straight up. So I got a 90 degree finderscope ,but ive found that because you have your eye against it, you only see a small portion of the sky.. persevere with it. Phill
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    Default Re: Replace red dot finder? Celestron Evolution 8

    You may be able to insert a small shim between the finder and the base to get it to align properly. If so, I would be content. If not, I would either replace it with a better RDF or an optical finder, the Telrad is rather large and I personally don't care for one (although many people do).

    The choice would depend on whether I wanted to star hop to targets or just rely on the goto. For aligning the mount, all you need to do is find and center the alignment stars and a RDF is all you need for that and the goto will take you any desired target. But if you want to star hop, or if your goto isn't all that accurate (possibly because of the user) then you will want an optical finder. Personally, I would prefer to get an optical finder as they are just more useful.

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    Default Re: Replace red dot finder? Celestron Evolution 8

    I use a 9x50 right angle finderscope and would never use an RDF again.
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    Default Re: Replace red dot finder? Celestron Evolution 8

    I have ran into this problem many times when mounting a scope t a rifle. Regardless of what type of scope it was or how much it cost, sometimes there just was not enough adjustment left to center the scope.
    In all cases, the problem was not with the scope, but with the scope mount. However in the case of your red dot scope They are a once piece unit.
    I have the Celestron Nexstar 8SE which also has the same red dot scope. Like you, I ran out of adjustment before I could get it centered. Since I am a complete newbie I did not want to add a finder scope to my ever growing list of desired accessories. i.e. Dew Shield, Power Supply, Eye Pieces, Books, etc. At least not at this time.

    My solution was to remount the red dot scope while putting a little pressure on it to move it left or right. NOTE: it takes very little change to effect a big difference to the aim point of the scope. I had planned to do what Ozman13 suggested and use a shim, but it was not necessary. However most times it is so just be aware that even the smallest (thinnest) shim will have a big effect.
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    Default Re: Replace red dot finder? Celestron Evolution 8

    Are you keeping both eyes open when aligning/ looking through the RDF?
    This helps eliminate the parallax shift from your eyes.
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    Default Re: Replace red dot finder? Celestron Evolution 8

    The red dot finder on my Evo took some working with to get it aligned with with the scope, but I was finally able to get it close enough. The main reason I'd say try to make it work before replacing it is that on my Evo, once aligned, I turn the RDF off and never use it again the rest of the night. It's really only there for your initial alignment and then use go-to. As long as I was able to use the finder to get my alignment stars in the field of view of a wide field eyepiece it was close enough for me. Your experience may be different of course.
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