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Old 14-04-2024, 08:56 PM
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BlueGumby (Graham)
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iStar D180mm F8-R30(F1440) Objective Lens (Anastigmat) with Front & Back Plates $1950

iStar D180 F8-R30 (F1440) Doublet Objective Lens with Back Plate, Front Mounting Ring and machined lens cap. Includes Moonlite Focuser adapter (M100x1.5, connects to standard Moonlite large format 2-1/2" focuser), two finder scope mounts with backing plates and two 235mm mounting rings. Focuser is not included.

This is going to make a wonderful instrument suitable for planets or deep space with a full 180mm aperture. The R30 designation indicates that the correction for chromatic aberration is equal to or better than a classic achromat with 30% longer focal length (ie. better than F8 x 1.3 = F10.4, or 1872mm).

The objective is of a high quality and was purchased directly from iStar Optical in Arizona, USA in 2020. This was one of their prototype D180/R30 objectives with a weight of 7.9Kg in mounting cell.

The lens has been manufactured using a heavy flint and special crown glass to achieve a high level of correction. The resulting lens is optically excellent.

The back plate and front mounting ring suit a rolled aluminium tube of 230.8 inside diameter x 1050 length.

The front and back plates were manufactured to suit my intended project, however they can easily be used build a more conventional telescope tube. Construction notes and photos for my tube design are here:-

https://istarscopeclub.proboards.com...0-r30-build-oz

Post or pickup from Frankston South.

thanks for looking!
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Last edited by BlueGumby; 28-05-2024 at 03:31 PM. Reason: Price drop
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Old 28-05-2024, 03:33 PM
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BlueGumby (Graham)
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Price drop

Bumping the listing for a price drop from $2650 to $1950.

cheers... Graham
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