NikonGear'23
Gear Talk => Lens Talk => Topic started by: Zang on October 16, 2022, 17:41:21
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Hi all,
I slipped my hand with the spanner on the retaining ring during my latest overhaling project. Luckily the lens is untouched. However, the ring got two shiny bare metal areas where the paint got stripped. I tried using a permanent marker to mask it but permanent marker ink looks very glossy. Do you have any recommendation on what paint to use?
Ideally that is something easy to find.
I am hopping I can use the same paint to repaint the edges of the objectives as those also got washed away when I dipped them in cleaning solution.
Cheers,
Zang
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Touching up the existing paint will almost always be visible - my suggestion is to go to your local motor parts store and buy a can of matt black spray paint, sand the top edge of the ring so it smooth and then give it a couple of coats of matt black paint.
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Model paint:
Tamiya 81701 Matt black;
Revell black mat (VE6)
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I used flat black VHT Motorcycle Case Paint on enlarger negative carriers and found that it stood up to continuous use over decades. This was on aluminum which is probably what most motorcycle cases are made of. I'm not sure how it would adhere to brass or stainless steel. I would think VHT Case Paint was specifically formulated for use on aluminum.
Dave
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Touching up the existing paint will almost always be visible - my suggestion is to go to your local motor parts store and buy a can of matt black spray paint, sand the top edge of the ring so it smooth and then give it a couple of coats of matt black paint.
I don't care much about the difference, but the glossy permanent marker ink is a bit reflective. I was hoping the paint can also be used for the objective edges but spray will not work. I'll keep looking for something brush-able. Thanks for the tip.
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Model paint:
Tamiya 81701 Matt black;
Revell black mat (VE6)
Thanks, I'll check those. Not sure if they are available here in Canada.
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I used flat black VHT Motorcycle Case Paint on enlarger negative carriers and found that it stood up to continuous use over decades. This was on aluminum which is probably what most motorcycle cases are made of. I'm not sure how it would adhere to brass or stainless steel. I would think VHT Case Paint was specifically formulated for use on aluminum.
Dave
Motorbike, gun touch-out paint is a great idea. I see they are available in the US, but not much here in Canada. Will keep looking. Thanks Dave.
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Humbrol matt black modellers paint in the little 14ml tinlets has worked for me. On larger items like the insides of lens hoods and extension tubes, matt blackboard paint is another option.
Model paint:
Tamiya 81701 Matt black;
Revell black mat (VE6)
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I don't care much about the difference, but the glossy permanent marker ink is a bit reflective. I was hoping the paint can also be used for the objective edges but spray will not work. I'll keep looking for something brush-able. Thanks for the tip.
You can just spray into the cap and use a brush in the collected paint - being thinner than model paints it will brush on easily.
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At the end, I found a small can of rust pain in my garage that says flat. I use a small drop to touch up the bare metal area of the ring and it looks great!
For the objective walls, I actually used the permanent marker. My thinking was, the glass walls are matte ground glass so even though, the marker ink looks shinny on flat surface, it should not be reflective on the objective walls, especially when the light is projected from inside the glass.
The lens is back in one piece. A dirty lens with fungus grown inside turned into a shinny, like new looking lens. This is my first 28mm f2.8 AIS (with CRC) and a quick test yields excellent results! I will need to check and possibly adjust the infinity tomorrow as the last step. Luckily, 28mm has very convenient infinity adjustment that does not require too much of disassembly job.
All in all, I am pretty happy with the project. Thanks everyone for your inputs.
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I use this, Humbrol 033 Black Matt it's not reflecting any IR
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https://nikongear.net/revival/index.php?topic=9894.msg169119#msg169119
(https://nikongear.net/revival/index.php?topic=9894.msg169119#msg169119https://nikongear.net/revival/index.php?topic=7095.msg116143#msg116143)https://nikongear.net/revival/index.php?topic=7095.msg116143#msg116143 (https://nikongear.net/revival/index.php?topic=9894.msg169119#msg169119https://nikongear.net/revival/index.php?topic=7095.msg116143#msg116143)
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I use this, Humbrol 033 Black Matt it's not reflecting any IR
Thanks Eric. It's a bit too late for me I guess... Is it an enamel or an acrylic paint?
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It's Enamel so long lasting
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Best is Musou Black, which absorbs 99.4% of light. Black 3.0 absorbs 97.5%. Vantablack is even better, but costs a fortune.
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Best is Musou Black, which absorbs 99.4% of light. Black 3.0 absorbs 97.5%. Vantablack is even better, but costs a fortune.
Thanks Toby! I paid $67 for my 28mm so for sure I do not plan to spend fortune on the paint or get it shipped from overseas. Beside, I have already applied permanent marker on the glass walls. The walls are basically ground glass surfaces so the maker ink looks ok there. It look decently dark and not shinny when looking at it from inside the objectives. However, one of the painted area which has a circle shape faces to the rear and the ink is visible when looking from the rear of the lens. It looks dark but a bit shinny and that is where I might be thinking about repainting if I can find something really flat, but relatively cheap and available. All I need is a tiny drop of the paint :)
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I used the Humbrol 033 after recommendation from Erik and it worked very well.
It came in small 14ml can. But you don't need much.
This paint was recommended by a German company selling equipment and Telescopes for looking at stars:
https://www.lack-albrecht.de/produkte/spezialprodukte/speziallacke/schultafellack/ (https://www.lack-albrecht.de/produkte/spezialprodukte/speziallacke/schultafellack/)
It comes in big cans. I have a can but have not tried it.
It is a paint that is used for making a blackboard for drawing with blackboard chalk (if this is the correct name for it).
So, it is very matt I assume.
I remember the company suggested it to be diluted. Will probably require some experiments for best result.
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Thanks Meper!
Humbrol is available online in Canada, but I could not find the exact product you purchased. On another hand, I tested my painted lens and I do not notice any issue with internal reflection so I might leave it alone until I need to paint another lens.
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And there is Vantablack, the darkest black available, made of Vertical Aligned Nano Tubes.
https://youtu.be/QCI2KYhC8vk
But normally not available to individuals.
https://www.surreynanosystems.com/purchasing
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The Albrecht matte paint I got from this company (I might have been able to find it cheaper another place):
https://www.gerdneumann.net/english/instrument-building-parts-teile-fuer-den-fernrohrbau/totmatte-schwarze-optikfarbe-deep-black-optical-paint.html (https://www.gerdneumann.net/english/instrument-building-parts-teile-fuer-den-fernrohrbau/totmatte-schwarze-optikfarbe-deep-black-optical-paint.html)
About the dilution I mentioned earlier seems to be the suggestion to mix with fine sand to enhance the performance.
Now telescopes are bigger, so a larger amount of paint is necessary. Then the Albrecht may be a cost-effective alternative to other type of paint.
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If you are not determined that the paint must be oil based, you could look for blackboard paint. I had a can of this once (oddly enough to paint a blackboard with) and it was very flat and non-reflective.
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Thank you MFloyd, Meper, Matt...
I think black board paint sound to be the most popular option. I see a bunch of them in Amazon. I might try one in my next project.
BTW, in the meantime I did the internal cleaning job for my Micro Nikkor 55mm f2.8 and its objective's wall paint was washed away as well. After investing the light path, In came to conclusion that the paint loss practically has no negative impact to the picture so I put the lens back without painting.