Is isopropyl alcohol an AR friendly lens cleaner by the way? All the description says is that it’s 70% isopropyl alcohol. When i wet some tissue paper and dab the lens with it it leaves behind liquid stains and i don’t know why. I hope it’s not actually dissolving the AR coating?
Isopropyl alcohol has water in it which is left behind when the alcohol quickly evaporates.
A lens cleaner like Zeis pads from Walmart or any optical store, places that sell glasses or drug stores usually have them as well, these work best. They’re made for AR coated glasses so of course a lens is a lens.
Nice pic! Really shows what this bad boy does, love it!
Edit: One of very few reflectors I’ve seen that puts out a column of light that doesn’t cross over, most make an “X” pattern where the optimal focus point crosses over and flares back out, reducing effective distance. This one makes over a mile because of the great collimation of this awesome reflector, ya just gotta love it!
Hi Dear, I have used 99,9 isoprophyl alcohol and window cleaner (blue liquid) none of those were harmful to the AR coating (purplish or greenish) I guess the traces you see when you use 70% isoprophyl is due to the residue left of almost 30% water content. Hope this help you.
I have to smile when I see you post nodoubt… we had a good friend named Winston that worked in an Automotive parts store who used to say No Doubt! all the time! lol [ie: “These parts are EXPENSIVE!” “No Doubt!”] As such, your tattletale response above elicited an immediate “No doubt!” in my mind, making me laugh at the double entendre. (all this instead of simply saying …)
I’m thinking of getting a 2nd TN42, would the CW be better at cloud-lighting than the NW? After all it is a cooler temperature beam that works wonders at illuminating fog than a warm one.
Cooler tints tend to have more backscatter in general, and so probably would illuminate the surface of a cloud more. When trying to illuminate solid objects to view them, this is a disadvantage, but it might well work better for that.