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09-27-2018, 01:16 PM   #1
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Fixing Baader-U with crack

So I just bought a 2" Baader-U with a crack for 35 which I am rather pleased with CONSIDERING THE BLOODY THINGS COST NORTH OF 250 NEW! Shout over

So it has the tiniest of tiny cracks, barely visible in this (terrible phone) photo:



So I'm wondering, it's a hairline crack, I think I can probably get away with a very thin accurate slice of gorilla tape over both sides.

But curious if anyone has tried this/found a more cost effective solution OR indeed if the filter will degrade because of exposure to air?

Thanks

09-27-2018, 02:29 PM   #2
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Air shouldn't cause the crack to get worse. Movement and temperature shifts might make it worse. The crack will decrease contrast - how much I don't know.

I suggest trying some photos with the crack as-is. Then repeat the photos with black tape covering the crack to compare. A thin tape strip might show when you are focusing close. At infinity it will blur away.

Letting thin black ink seep into the crack might be a further improvement, as it will make the internal fracture darker, but is difficult to undo if it goes wrong. It would serve a similar purpose to edge blackening on lenses.
09-27-2018, 03:52 PM   #3
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How about one of those DIY windscreen crack repair kits? Basically a clear acrylic in a syringe. You stick a base near the end of the crack, snap the syringe on and apply pressure. The theory is the acrylic gets forced into the crack and cures clear in sunlight or with a UV light. I used one once on a crack caused by a bit of gravel hitting the screen on the highway. It did a fair job of filling about 60% of the crack It did seem to keep the crack from getting worse.

Of course there is the possibility the adhesive on the base might pull off any coating on the lens.

Last edited by Not a Number; 09-28-2018 at 06:16 AM. Reason: typo any coating vs an coating :)
09-28-2018, 01:34 AM - 1 Like   #4
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Great, thanks guys, appreciated. FWIW optical qualities don't matter, this baby sits over the flash for UVIFL

See Torches and UV flash for ultra violet fluorescence macro photography

And fwiw, I reached out to Baader, they're going to work with me in a sort of ambassador type gig. Specialised filter development and all that, so it's all good. Filters till the cows come home

Cheers

09-28-2018, 06:58 PM   #5
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QuoteOriginally posted by Nass Quote
Great, thanks guys, appreciated. FWIW optical qualities don't matter, this baby sits over the flash for UVIFL
In that case I would worry about the heat from the flash tube making the crack worse.
09-28-2018, 10:02 PM   #6
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QuoteOriginally posted by Not a Number Quote
In that case I would worry about the heat from the flash tube making the crack worse.
Yes, I put a clear glass filter on before for that reason
09-29-2018, 10:54 AM   #7
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QuoteOriginally posted by Nass Quote
Great, thanks guys, appreciated. FWIW optical qualities don't matter, this baby sits over the flash for UVIFL

See Torches and UV flash for ultra violet fluorescence macro photography

And fwiw, I reached out to Baader, they're going to work with me in a sort of ambassador type gig. Specialised filter development and all that, so it's all good. Filters till the cows come home

Cheers
Congrats on the Baader deal. Your 35 gamble on the cracked filter worked out very well.
09-29-2018, 12:15 PM   #8
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QuoteOriginally posted by DeadJohn Quote
Congrats on the Baader deal. Your 35 gamble on the cracked filter worked out very well.
Thanks, I'm quite pleased, should be exciting having the opportunity to work with expert filter makers

This is their site baader-planetarium.com/en/filters.html, they do good stuff supernerdy!

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