36 replies to this topic

[rgk901]

Can someone who has experienced it describe precisely what "ghosting on Jupiter and the moon" looks like and what conditions make it worse? I ask mainly because I didn't notice anything on my Jupiter test in the 10" f/5 and I'm wondering if I should be adjusting some variables or looking carefully at some part of the image.

I will say this hobby is a lot more fun when one doesn't find out about all these aberrations and just enjoys the views

[star acres]

I didn't buy gold lines. I bought SvBony Redlines. I believe the Gold lines have a plastic lens snuck in and the Redlines have all glass. I have the 6,9, and 20. The 9 is my favorite. The 6 has many of the same internal components. The 20 is much shorter. I don't see glare. The 6 is the most kidney bean, but I will discipline myself. The rubber cones are just fine. The 20 gives a strong grey shadow in the center during day terrestrial views. All three have noticeably out of focus edges. Their contours just aren't right. They are still a luxury item after the .965 teeny weeny lens eyepieces I often saw through before I had my own telescope.

[CrazyPanda]

The gold and red lines are mechanically and optically identical. There are no plastic lenses. You may confusing gold lines (6,9,15,20) with those horrible aspheric 62 degree eyepieces with a gold band on them (4,10,23). Those 62 degree aspherics *do* have a molded plastic aspheric element.

[starfinder123123]

Can someone who has experienced it describe precisely what "ghosting on Jupiter and the moon" looks like and what conditions make it worse? I ask mainly because I didn't notice anything on my Jupiter test in the 10" f/5 and I'm wondering if I should be adjusting some variables or looking carefully at some part of the image.

Ghosting is when you look at the bright objects, Moon and Jupiter, there appears a second image of the Moon or Jupiter right next to original. This second image looks lijj li e an obvious reflection of the original object and makes the observing very hard or impossible.

[quilty]

Can someone who has experienced it describe precisely what "ghosting on Jupiter and the moon" looks like and what conditions make it worse? I ask mainly because I didn't notice anything on my Jupiter test in the 10" f/5 and I'm wondering if I should be adjusting some variables or looking carefully at some part of the image.

I find that "ghosting" in the 6 mm only as the ring of fire at the terminator It's no reflection of the object but a reflection of the scope's clear aperture. Thus a ring of fire in obstructed scopes, specially in the cat hut. At Jupe you can still see a hint of it but at dimmer targets there's no such reflection
I like the 15 mm most. The 9 shows most kidney and makes a brownish tint. The 20 is good, too. It just shows, in some scopes thoe outmost 1-2° of the FOV a bit dimmed, which to me is no drawback at all at use. Can't discern a dimmed FOV edge in the dark sky.

Edited by quilty, 23 April 2025 - 05:40 AM.

[Jon Isaacs]

I will say this hobby is a lot more fun when one doesn't find out about all these aberrations and just enjoys the views

 

Part of learning to see is learning to see aberrations... It's my choice whether or not they bother me.  

 

Not long ago, I was looking through my stuff and I found a 30 mm GSO SuperView I hadn't seen for quite a number of years.  It's a basic eyepiece with no field stop and a lot of off-axis astigmatism.  But I have been using it and enjoying it.

 

The 15mm 66 degree at F/4.5... I have had several of these eyepieces.  They came out more than 20 years ago, right after the Orion Expanse series.  They were the first affordable wide fields.  I bought the 6mm, 9mm and 15 mm as Adorama had a buy 2 and get one free deal.. 

 

My main scope at the time was my 12.5 inch F/4.06. With a Paracorr, it is F/4.67.  The 15mm showed a lot of off-axis astigmatism as did the 20mm.  The 6mm and the 9mm are negative-positive eyepieces, a negative doublet in the barrel, they are much better in a fast scope.  In an 80mm F/11.3 refractor, the 15mm and 20mm are quite good.

 

Jon

[rgk901]

Part of learning to see is learning to see aberrations... It's my choice whether or not they bother me.

......

Jon

If one is a perfectionist or has some 'OCD' type inclinations, learning to see the aboborations will never allow one to not be bothered by them

...like that squeak in your car you finally hear and can never unhear and it drives you nuts hahaha

[Jon Isaacs]

If one is a perfectionist or has some 'OCD' type inclinations, learning to see the aboborations will never allow one to not be bothered by them

...like that squeak in your car you finally hear and can never unhear and it drives you nuts hahaha

 

Fortunately I do not suffer from this particular form of OCD.

 

Often the most apparent aberration is the seeing.. There's nothing I can do about that except enjoy it the best I can.

 

"Things turn out the best for those who make the best out of how things turn out." John Wooden

 

I will say it's probably easier to accept the aberrations of a 30 mm Superview if one has other eyepieces that are better corrected.

 

Jon

[SeattleScott]

If one is a perfectionist or has some 'OCD' type inclinations, learning to see the aboborations will never allow one to not be bothered by them

...like that squeak in your car you finally hear and can never unhear and it drives you nuts hahaha

Just turn up the radio.

[SeattleScott]

Ghosting is when you look at the bright objects, Moon and Jupiter, there appears a second image of the Moon or Jupiter right next to original. This second image looks lijj li e an obvious reflection of the original object and makes the observing very hard or impossible.

I don’t find ghosting much of an issue. The Moon takes up about the whole view so no worries about seeing a reflection off your eyeball. It’s mostly just a Jupiter thing, and the ghost image is normally off to the side of Jupiter and can be ignored, although I understand how it could feel distracting. I don’t love ghosting, but I’m not willing to remove my eyeball (the source of the reflection) to get rid of it.

[Jon Isaacs]

I don’t find ghosting much of an issue. The Moon takes up about the whole view so no worries about seeing a reflection off your eyeball. It’s mostly just a Jupiter thing, and the ghost image is normally off to the side of Jupiter and can be ignored, although I understand how it could feel distracting. I don’t love ghosting, but I’m not willing to remove my eyeball (the source of the reflection) to get rid of it.

 

The best views of the moon are along the terminator so there are plenty of opportunities for ghosting. 

 

Jon

[quilty]

I don’t find ghosting much of an issue. The Moon takes up about the whole view so no worries about seeing a reflection off your eyeball. It’s mostly just a Jupiter thing, and the ghost image is normally off to the side of Jupiter and can be ignored, although I understand how it could feel distracting. I don’t love ghosting, but I’m not willing to remove my eyeball (the source of the reflection) to get rid of it.

Try the 6 mm goldline through an SC at the terminator, better still an RC. That's really annoying. Though I'm not demanding at optical perfection and though I like all them 4 goldlines, this one is a no-go at the terminator. And have now three replacement eyepieces for that. (the 6 mm goldline takes no less than three! other eyepieces for a substitute)

Edited by quilty, 26 April 2025 - 05:19 AM.