108 replies to this topic

[denis0007dl]

Here are some examples of my NEW prchased APO telescopes, with boxes unopened and had scratches....

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[denis0007dl]

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[denis0007dl]

Here is my LZOS 180mm APO lens...

 

[denis0007dl]

...and...

 

[denis0007dl]

...example of chipped prism in binoviewers...

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[denis0007dl]

...small chip lens edge on brandnew AP BARADV barlow...

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Edited by denis0007dl, 19 June 2024 - 08:47 AM.

[denis0007dl]

...brandnew TeleVue BinoVue optical delamination in beamsplitter...

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[denis0007dl]

ES 20mm 100 deg, brandnew, uncoated area...

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[denis0007dl]

Brandnew arrival of APO SS binoviewers (not only one), with optical delaminations inside beamsplitter (can not be cleaned)...

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[denis0007dl]

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[denis0007dl]

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[denis0007dl]

Ok, now you have examples of everything how it looks like, and dont need to share more images, right? 

 

Kind regards,

Denis

[noisejammer]

I purpose an experiment. Someone take one of your clean eyepieces. Do some observing for a baseline. Now sprinkle a little flour (or your preferred dust proxy) onto it. How much “dust” until performance is noticeably diminished? Would be an interesting test.

Once upon a time, I had an urge to drag my home-made 6" f/8 Dob out for a play. I eyeballed Saturn but it was quite dim. Odd. I looked in the top and I couldn't see a reflection from the primary.

 

The scope had been sitting in the corner gathering dust. Quite efficiently, it turned out. I pulled the mirror cell and it was buried an eighth of an inch (3 mm) deep.

 

... And it still worked as a telescope. Just sayin'...

 

To return to the topic - cleanliness.

 

30+ years back I occasionally worked in a Class 100 clean room with Class 10 work stations. Getting in there was a performance - vacuum yourself, remove clothes, pull on bunny suit, climb over the barrier, walk to the next change room, vacuum yourself, remove bunny suit, climb over a barrier, walk to the next pressurised area, put on another clean bunny suit, hat, face mask, shoes, fasten all the velcro tape, vacuum yourself, put on gloves. Enter the pressurised area. Work.

 

So every time I entered the clean room it was at least two sets of gear and 10 minutes of preparation.

 

It sounds tedious but easy. It isn't. It's expensive and something you only do when it's absolutely crucial. I'd like perfect optics but I'd much rather pay for slightly imperfect toys.

[denis0007dl]

P.S. oh sorry, just to add one diagonal example, brandnew Baader BBHS 2" mirror under angle...

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[Ihtegla Sar]

Once upon a time, I had an urge to drag my home-made 6" f/8 Dob out for a play. I eyeballed Saturn but it was quite dim. Odd. I looked in the top and I couldn't see a reflection from the primary.

The scope had been sitting in the corner gathering dust. Quite efficiently, it turned out. I pulled the mirror cell and it was buried an eighth of an inch (3 mm) deep.

... And it still worked as a telescope. Just sayin'...

To return to the topic - cleanliness.

30+ years back I occasionally worked in a Class 100 clean room with Class 10 work stations. Getting in there was a performance - vacuum yourself, remove clothes, pull on bunny suit, climb over the barrier, walk to the next change room, vacuum yourself, remove bunny suit, climb over a barrier, walk to the next pressurised area, put on another clean bunny suit, hat, face mask, shoes, fasten all the velcro tape, vacuum yourself, put on gloves. Enter the pressurised area. Work.

So every time I entered the clean room it was at least two sets of gear and 10 minutes of preparation.

It sounds tedious but easy. It isn't. It's expensive and something you only do when it's absolutely crucial. I'd like perfect optics but I'd much rather pay for slightly imperfect toys.

Oh, please. No one is suggesting optical companies should use a "class 100 clean room" and go through all that. They could eliminate 90% of the dust for less than 10% of the cost and hassle you are describing.

A set of fans and hepa filters to create positive pressure with clean air. Don hair net and wipe shoes on a mat before you enter. Simple and effective to eliminate most of the dust we are seeing on internal surfaces of eyepieces.

[Starman1]

...and...

That lens has fungus growing inside it.

[Starman1]

ES 20mm 100 deg, brandnew, uncoated area...

Those are common, and caused by a dirt particle on the lens in the coating chamber.

[denis0007dl]

That lens has fungus growing inside it.

Incorrect, thats reflection of pillow 

 

Zero fungus of any kind-checked extremly well!

[denis0007dl]

Those are common, and caused by a dirt particle on the lens in the coating chamber.

Yeeep, thats correct, and I know that 

Edited by denis0007dl, 19 June 2024 - 10:36 AM.

[Mike B]

Ok, now you have examples of everything how it looks like, and dont need to share more images, right? 

 

Kind regards,

Denis

  

 

 

[Scott99]

I've seen a few "figuring marks" or scratches on new lenses but nothing to the degree of the LZOS photo.