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Old 19-04-2019, 11:33 AM
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Astromelb is offline
Join Date: Jan 2008
Location: Melbourne
Posts: 373
Pentax 100 SDUF II APO

FOR SALE - Pentax 100 SDUF II APO.

Time to move on some more gear that I have collected in the last five years that I will simply never use.

This is a very very rare and exceptional telescope, I rate this higher than a FSQ106 - as whilst the FSQ is terrific, the FSQ is f5 where this is much faster at f4. There is a very BIG difference between f5 and f4 as those that have experience in astroimaging will be very well aware.

Supply includes telescope with Vixen tube rings & Skywatcher dovetail : $2500.

The scope was purchased in a large bulk deal with long term regular IIS participant about 4 years ago. It is an excellent telescope and is in fully operational both mechanically & optically.


The Pentax 100 SDUF II APO refractor is a super-portable, super-fast telescope which performs beautifully when used visually or as an instrument for imaging. Weighing only 8.8 lbs and measuring less than 20" in length, the Pentax 100 SDUF II can travel with you anywhere at a moment's notice.

The 4-element, 2-group design of the Pentax 100 SDUF II was created to produce excellent image quality over the entire field of view. The front element in the first doublet is made of Super Dispersion exotica level SD glass, and a two-lens integrated corrector contributes to a flat field that is especially noticed when used for imaging.

Along with the addition of state-of-the-art internal baffling, this telescope yields images with excellent contrast and detail, with great colour correction, even at high magnifications. Special multi-coatings designed to increase the transmission of astronomical wave lengths are also used.

The drawtube has an inside diameter of 88mm, and fully illuminates 6 X 4.5 format with ease. The helical focuser includes a scale that allows precision focus to 0.02mm or better with a large knurled ring that fits the hand comfortably. This is particularly smooth and precise, excellent for astroimaging.


* Telescope Type: SDUF II Apochromatic Refractor
* Lens Design: 4 elements, 2 Groups
* Coatings: SMC Multi-Coatings
* Aperture: 100mm (3.9")
* Focal Length: 400mm
* F/Ratio: 4
* Image Circle: 88mm
* Drawtube Inside Diameter: 83mm
* Resolution: 1.16 seconds
* Visual Limiting Magnitude: 11.7
* Light-Gathering Power: 204
* Tube Diameter: 4.53"/115mm
* Tube Length: 19.37"/492mm
* Tube Weight: 8.8 lb./4kg

Pick up from Bentleigh, Melbourne or shipment nationally or internationally at cost.

Thanks for looking.
Attached Thumbnails
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Click for full-size image (Pentax SDUF100 #3.jpg)
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Click for full-size image (Pentax SDUF100 #4.jpg)
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Last edited by Astromelb; 24-04-2019 at 05:21 PM. Reason: Name removed at request of person named


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