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update this page as inventory changes, but cannot guarantee a given item will still be available at the time you place an order for listed “in stock” product. Please be sure to carefully read all ordering terms and conditions and also note the item # with your online order form submission.

 

If you are notified that the item you ordered is no longer in stock you can be placed on our waiting list to be notified when other similar products are available or in the event of a cancellation. To do so just type “WAITING LIST” in the special instructions section of the online order form. Please note that this in no way obligates you to purchase any DGM Optics products.

 

 

 

Please note that all listed scopes and optics are “firsts” unless otherwise noted.

 

     Quantity                                                            Item Description

1

                  

3.1 minor axis elliptical secondary mirror. This is an old Orion Telescope and Binocular optic from back in the day when they made them.

 

$75 including S&H

 

Item# 3.1MA_SEC_110909

1

                 

4 inch F8 meniscus lens. The focal length of just the single surface concave side is approximately 32 inch FL (spherical). I acquired several of them from a former employer and made one into very nice 4” conventional newt. It produced excellent images. It does require a mirror mount that imparts very little stress on it.  But a mirror cell that has an adjustment which pulls on the back of the lens while supporting the circumference of the lens/mirror might correct it to a parabola. Even without that configuration the one I built functioned beautifully as an F/8 spherical.  These are very high quality optics. Not certain, but I believe the material is BK7.

 

I used 6.125” x 36” drain pipe from McMaster-Carr for the tube. And a 1.1-1.25” minor axis secondary mirror is a good match for that mirror.

 

$100 including S&H

 

Item# 4.0F/8_MENL_110909

 

 

 

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