4" Refractor that can support wide field eye pieces.

[Deadlake]

1 hour ago, John said:

The ED102SS weighs around 4kg with tube rings and a diagonal fitted.

Today's nearest equivalent is the 102mm F/7 FPL-53 doublet refractors of which there seem to be versions by Telescope Services, Altair, Technosky etc.

 

This model was also an option

https://www.365astronomy.com/apm-telescopes-super-ed-apo-astrograph-107-700-apochromatic-refractor-telescope-with-3-apm-focuser

is F6.5, it’s been discontinued due to SharpStar quality control issues. However there is a Long Perng 104/650 built model for APM in the pipeline with an optional Starlight FT focuser option. Not LZOS but half the price.

 

[Stu]

25 minutes ago, Deadlake said:

This model was also an option

https://www.365astronomy.com/apm-telescopes-super-ed-apo-astrograph-107-700-apochromatic-refractor-telescope-with-3-apm-focuser

is F6.5, it’s been discontinued due to SharpStar quality control issues. However there is a Long Perng 104/650 built model for APM in the pipeline with an optional Starlight FT focuser option. Not LZOS but half the price.

 

https://www.firstlightoptics.com/stellamira-telescopes/stellamira-104mm-ed2-triplet-f6-25-apo-refractor-telescope.html
 

??

[Deadlake]

12 minutes ago, Stu said:

https://www.firstlightoptics.com/stellamira-telescopes/stellamira-104mm-ed2-triplet-f6-25-apo-refractor-telescope.html
 

??

Is that fabricated by Long Perng? Even so just because it’s the same factory different specs, happens a lot with EP’s and scopes..

Wonder what the back focus is, 96 mm,  very short…

Edited June 4, 2021 by Deadlake

[Stu]

7 minutes ago, Deadlake said:

Is that fabricated by Long Perng? Even so just because it’s the same factory different specs, happens a lot with EP’s and scopes..

Wonder what the back focus is?

Yep, Long Perng. I’m sure FLO would be able to confirm the back focus. Scopes checked by Ed Reid.

 

[John]

1 hour ago, Deadlake said:

This model was also an option

https://www.365astronomy.com/apm-telescopes-super-ed-apo-astrograph-107-700-apochromatic-refractor-telescope-with-3-apm-focuser

is F6.5, it’s been discontinued due to SharpStar quality control issues. However there is a Long Perng 104/650 built model for APM in the pipeline with an optional Starlight FT focuser option. Not LZOS but half the price.

 

I was looking at doublets that use FPL-53 rather than triplets. The above and the one that Stu links to are certainly options though.

 

 

[Stu]

1 hour ago, Deadlake said:

Is that fabricated by Long Perng? Even so just because it’s the same factory different specs, happens a lot with EP’s and scopes..

Wonder what the back focus is, 96 mm,  very short…

As John says, there are ED doublets around like this one:

https://www.teleskop-express.de/shop/product_info.php/info/p9868_TS-Optics-Doublet-SD-Apo-102-mm-f-7---FPL53---Lanthan-Objective.html
 

This says 123mm back focus. Some of the TS scopes have removable sections to increase back focus for binoviewing.

[Stu]

Eg this one which can up to 230mm back focus with both sections removed.

https://www.teleskop-express.de/shop/product_info.php/info/p11024_TS-Optics-PHOTOLINE-107-mm-f-6-5-FPL53-Triplet-Apo---3-5--Focuser.html