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White Light Solar wedges

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#26 BYoesle

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Posted 13 March 2019 - 09:42 AM

Just ordered a couple of Beloptik UV/IR on KG3 filters from Oliver Smie, prices are less than shown - no VAT for non-EU customers:

 

2" - 100 Euros

 

1.25" - 66.36 Euros

 

Shipping - 7.00 Euros

 

PayPal fees - 8.53 Euros.

 

For solar wedge use (including CaK filtering), these are one of the best IR blocking filters one can get ;-)


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#27 crazyqban

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Posted 13 March 2019 - 09:58 AM

Bob, what is KG3?



#28 MalVeauX

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Posted 13 March 2019 - 10:12 AM

what is KG3?

Heat absorbing glass, it absorbs the heat transfer from IR wavelength instead of reflecting it.

 

Very best,



#29 crazyqban

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Posted 13 March 2019 - 02:04 PM

Heat absorbing glass, it absorbs the heat transfer from IR wavelength instead of reflecting it.

Thank you Marty. waytogo.gif


Edited by crazyqban, 13 March 2019 - 02:04 PM.


#30 George9

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Posted 13 March 2019 - 02:08 PM

Just ordered a couple of Beloptik UV/IR on KG3 filters from Oliver Smie, prices are less than shown - no VAT for non-EU customers:

 

2" - 100 Euros

 

1.25" - 66.36 Euros

 

Shipping - 7.00 Euros

 

PayPal fees - 8.53 Euros.

 

For solar wedge use (including CaK filtering), these are one of the best IR blocking filters one can get ;-)

 

Bob, Oliver recommends against CaK for these. He says CaK is right on the border and depending on the particular item, it can be high or low (he mentioned 2 out of 4 worked in CaK). Mine transmits about 40% at CaK, so I just up the gain by 6dB. I asked if he could produce a KG3 with anti-reflection coating in a 2" cell and the market is too small to do a run. (I know you can get a 50mm KG3, but unmounted.)

 

But it is a great filter for continuum (over 90%) and for H-alpha (75%).

 

So glad you pointed these out, Bob. I should get another before they run out.

 

George


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#31 Smarque2

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Posted 16 March 2019 - 03:35 AM

I don't have to worry there is a 100% chance of clouds for my neck of the woods wherever that may be! I have the worst luck with eclipses both lunar and solar, transits both Mercury and Venus. If there is something that's a once in a lifetime event. Stay as far away from me! I traveled to South Carolina to see the eclipse. Made a reservation for a site. Right at totality a huge cloud rolled in and shut out. A friend who met up with my family saw the whole thing about 2 miles away in a CVS parking lot!

my flight was grounded the day I was flying out to see the eclipse. I am flying out to FL to photograph the transit


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