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Thread: Not another ES 82 thread...re: 24 or 30mm

  1. #21
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    Default Re: Not another ES 82 thread...re: 24 or 30mm



    Quote Originally Posted by skaven View Post
    FYI, if you are looking to improve the views of globular clusters, a low magnification eyepiece is the wrong direction. Since stars are specular in nature, adding magnification (up to a 1mm exit pupil) does not increase their apparent size. The result is that the background gets darker while the stars stay the same brightness. Thus more magnification == you see more stars.
    Thank you for that Skaven! That crystalized and confirmed what had been floating about in my little bean head regarding why I got good views of globs with the 4.7 and 6.7! For what it's worth I have barlowed the 4.7 on a 6" Newt and the view was crisp and clear (we did have good seeing conditions) and it did make both M5 and Saturn really jump out. So much so that many of the club's senior folks had to come over to look through it. Seems no one had thought to do so before.
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  2. #22
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    Default Re: Not another ES 82 thread...re: 24 or 30mm

    Quote Originally Posted by Telrad View Post
    I would not suggest the 6.7 or even worse the 4.7 mm EP for globular clusters. With those ep's, the cluster would be very dim and focus would be very difficult. The highest mag EP I would recommend would be the 8.8mm. The more powerful ep's would be for planets and extremely bright objects. In my z12 f4.9 the 6.7 or 4.7 stars get very dim and distortion can be very bad.
    Actually I have found they don't dim down too badly and the view is quite nice actually. I usually use the 11 and 14's, since as you note you get a good balance between mag and view, but if the air is good I will go to the 8.8, 6.7, and 4.7 with some very good views. However I am using a slower scope than you guys are at f/7 and f/10 so perhaps that is the key.

    Oh and for the nebula the 18 is far better than the 24 for me. I get more detail closer focus and still wide field. I can get all seven of the Sisters in the 18mm and the Double Cluster as well. My next purchase will be the OIII filter for neb's since nebula season is starting for me.
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  3. #23
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    Default Re: Not another ES 82 thread...re: 24 or 30mm

    Quote Originally Posted by Telrad View Post
    I would not suggest the 6.7 or even worse the 4.7 mm EP for globular clusters. With those ep's, the cluster would be very dim and focus would be very difficult. The highest mag EP I would recommend would be the 8.8mm. The more powerful ep's would be for planets and extremely bright objects. In my z12 f4.9 the 6.7 or 4.7 stars get very dim and distortion can be very bad.

    Many globs and open clusters look amazing in the 18mm and 11 mm EP. The larger clusters are amazing in the 30mm
    I disagree that they'd be "very dim", though I do agree that at higher power achieving fine focus can be difficult. I routinely observe globs with my 5mm ortho in my f/4.7 scope and they look great (assuming the atmosphere is cooperating). On nights with poor seeing, I generally do better with a 9mm.

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    Default Re: Not another ES 82 thread...re: 24 or 30mm

    I also agree with globs looking great under higher magnifications when the conditions are right. The conditions you need are good seeing, your objective mirror stabilized at ambient temperature, and good collimation. Having dark skies and your eyes well adapted to the dark helps a lot too.
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    Default Re: Not another ES 82 thread...re: 24 or 30mm

    I like the 9mm for globs too. Rarely do I get to go under that.
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