Lunt 1.25" Herschelwedge Set by APM in stock
Posted 12 February 2013 - 04:33 PM
Herschelwedges (Solarprism) are made for the solar observation with refractors. Around 95% of the solar light will be blocked. With an polarising filter and strong grey filter ND 3.0 the sunlight will be reduced to the necessary amount. Unlike objectiv solar filters the filtering happens close to the eyepiece or camera. Normaly the contrast and sharpness of the solar image with an Herschelwedge is much higher.
The advantages of the Lunt Herschelwedge:
Perfect surfaces for a very high contrast
Completely closed housing with integrated heat trap
No scattered light escaping, for maximum safety
Delivered in sturdy aluminium case with foam insert
Only for using with refractors:
The full solar energy enters the telescope and the filtering happens close to the focal plane, so we only recommend refractors for the working with the Herschelwedge. Otherwise the refractor shouldn´t have a rear corrector lens. The optical elements would heated through the concentrated solar energy and could be damaged. Also filters are only allowed at the eyepiece side of the Herschelwedge and not at the front.
The advantages of Herschelwedges at refractors:
In addition to the better image quality, the Herschelwedge offers more light. So you can use special contrast filter, like the Baader Solar Continuum. With filters like this you can increase the contrast at the sun.
Regulation of image brightness:
Of course 5% are too much for the solar observing. So you need an additional filter for light reduction. You can screw an ND3 Filter directly in the eyepiece connector, permanently installed . Because the Herschelwedge produces polarised light, you only need a simple polarising filter to screw into the eyepiece or photoadapter for additional light reduction. Now you can rotate the eyepiece and so reduce the light. With additional grey filters and the Baader Solar Continuum Filter you can reduce the brightness to the required amount and so affect the contrast.
Never use the Herschel wedge without an ND3 and Top Pol or Solar Continuum Filter !!! Otherwise permanent damage of your eyes may occur !!!
Top Pol Filter
APM Set Price US $ 199.- only
order today and we ship tomorrow
Posted 14 February 2013 - 02:05 PM
Are you attending the Winter Star Party this year?
Did you know that Jim Hammil is quite ill with COPD?
John Hicks (Solar H-alpha)- we all knew each other in the 90's at the Winter Star Party
Posted 14 February 2013 - 02:31 PM
I have a Meade 6000 80mm ED APO, besides eyepieces, what else would I need with this setup?
Posted 15 February 2013 - 09:44 AM
WSP is over, I was there. I dont know that Jim is ill, I was missing him at WSP, since he was there all past years. if you have contact to him, give him my best wishes