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  1. #1
    Bradley H's Avatar
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    Default A little bit confused



    Hi all; A friend has lent me a 4.5"/900mm Bushnell telescope. Come with 20mm 4mm eye piece and 3X Barlow. First of all the 4mm eye piece is a waste of time I think can't see anything. I can see Jupiter 1 cloud band(think may be 2 cloud bands) with the 20mm not so clear with the 3x Barlow a little fussy. When I found Andromeda galaxy I expected more it just a gray blob the same as I see it in my 15x70 binoculars except a little bigger, was hoping to see a bit of shape. The same with the m13.

    At what aperture will I start to see some shape?
    I check the collimation it was a bit out, was not to hard to collimate it.
    I'm busy saving up for a 8" dob don't know what one yet, a little confuse because of the 4.5"

  2. #2
    Dublin sky watch's Avatar
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    Default

    High power is not always best when viewing. 4.5" will not gather a great amount of light either. You might need a less high powered eye piece. With the X3 barlow in you will rarely get a sharp focus due to turbulance etc..

    Andromeda will always remain a fuzzy unless you get a really big scope. Detail will never be revealed much to the eye in visual viewing. This mainly comes out in imaging, when the shutter is left open for a while to gather a lot more photons on the sensor then your eye can see. An 8" will allow more light in and you will see a lot more objects in the sky then with the 4.5"...but detail? Andromeda will still be a bigger fuzzy if you understand...
    Declan.
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  3. The Following 2 Users Say Thank You to Dublin sky watch For This Useful Post:

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  4. #3
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    Default

    Declan hit the nail there.

    Clear Skies

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  5. #4
    Bradley H's Avatar
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    Default

    Thanks Declan have been thinking about being a 1.5x and a 2x Barlow, but it is a friend telescope that has been lying in is gorge for 2 years. Until I know what I want I don’t want to bye any Barlow.
    Well it is teaching me around the sky witch is good, and I am having fun out just looking around.

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    Default

    It is actually a great way to start off your interest to be honest. If you like what you see you can go in that direction (spending) Enjoy the way your going and save money just in case...
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    Default

    Remember the OLD rule-- maximum magnification under perfect sky conditions and with perfect optics is 50 times aperture.

    Usually you can only get 30-40 times aperture. SO 4.5 inch TIMES 50 equals 225 power tops. More than likely on most nights you will max out under 200 power.

    With my 10 inch DOB and my 8 inch LX90 I usually stick around 80- 200 power. I may use less than 80 if I am looking for a dim fuzzy object.
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  8. #7
    Bradley H's Avatar
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    Default

    I'm learning all the time, really like this forum for all the helpful people out there. Have to say that the 45 power (20mm eyepiece) is the one I all way used, when I try the 3x Barlow it is to dark not enough light, then go back to the 45 power.

 

 

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