judebox11

3 minutes ago, John said:

The coatings on the lenses could get scratched and that would notably devalue the eyepiece if you ever want to sell it, although it would still work fine.

Ah I forgot about the coatings, thanks for the help

25 minutes ago, Ben the Ignorant said:

You might scratch the lens.

3 minutes ago, John said:

As long as the filter does not touch the top lens (as Ben warns above) it does actually work. One technique of finding challenging nebula is to move a UHC or O-III filter in and out of the view though the eyepiece and see if the nebula can be spotted "blinking" on and off.

An issue that I've found when I've tried this is that the filter gets in the way of putting the eye at the right distance from the eye lens (ie: the eye relief distance) to enable the full field of view to be seen. Also the filter glass seems to attract annoying and distracting glare and reflections from any light sources nearby more readily than the eye lens of the eyepiece does.

 

Thanks for the replies, I cant imagine it being THAT sensitive that the filter just touching the lens would scratch the glass, are they really that fragile? I thought regular low strength steel/aluminium is softer than glass. ( obviously steel is stronger, but using Rockwell scale of hardness)

Hello, I was wondering if I could use a 1.25 inch UHC filter on a 2 inch eyepiece by putting on top of the part you look through on the eyepiece, 1.25 inch would cover all of it I think. I heard you could do this with moon filters so I was wondering if it could work like this?

12 minutes ago, Stu said:

The near full moon will mean you won't have the full benefit from the skies at the moment, which will make it hard to get much detail on DSOs

That said, you could try the Blinking Planetary NGC6826 which has a nice green colour to it.

I looked at NGC 6826 a few weeks ago (cant remember if there was a moon) it looked grey to me but the central star was obvious

Hi, I've an 8 inch skywatcher dobsonian and Its been a great tool, Hercules globular and ring nebula etc look amazing compared to my old 114mm.

Now I'm wondering what DSOs would show colour/structure in an 8 inch. I tried NGC 7662 blue snowball and it looked a bit blue, what have you seen colour in?

Galaxies with structure would also be cool, I heard Needle galaxy shows a dust lane. I live in bortle 3 in Ireland