View Single Post
  #1  
Old 04-08-2014, 03:32 PM
209herschel (Herschel)
Registered User

209herschel is offline
 
Join Date: Apr 2014
Location: Sydney
Posts: 87
Eyepiece smudge, Cleaning Advice

Hi everyone,

I have a GSO 10" undriven dob.

I recently started using a TMB Planetary II 9mm. I'm really happy with the added FOV over my 9mm GSO plossl. The only issue is that I think there may be a smudge or some residue on the lens. When viewing Saturn, as it drifts into the middle of the field, I see a ghosting of the image. So it's like a hazy trail coming off the image. Is this likely a smudge or some oil residue on the lens? I was going to buy some Bintel cleaning fluid or some alcohol based fluid from bunnings tomorrow and gently use a cotton bud to clean the lens. Is this a good method?

Holding a light up to it, I definitely see some marks on the lens. If not a smudge, is there anything else it could be? The reason I think a clean might work is because when I replace the TMB with my 9mm plossl, the image clears significantly and there's no ghosting.

Thanks in advance,
Herschel.
Reply With Quote