Go Back   IceInSpace > IceTrade Classifieds > Telescopes & Mounts

Thread Tools Rate Thread
Old 14-04-2024, 08:56 PM
BlueGumby's Avatar
BlueGumby (Graham)
Registered User

BlueGumby is offline
Join Date: Jul 2019
Location: Frankston South
Posts: 7
iStar D180mm F8-R30(F1440) Objective Lens (Anastigmat) with Front & Back Plates $2650

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.

Extensive construction notes and photos here:-


Post or pickup from Frankston South.

thanks for looking!
Attached Thumbnails
Click for full-size image (P1060579_40.jpg)
181.0 KB32 views
Click for full-size image (P1060577_40.jpg)
181.4 KB30 views
Click for full-size image (P1070784_40.jpg)
197.8 KB27 views
Click for full-size image (P1070785_40.jpg)
198.8 KB26 views
Click for full-size image (P1070786_40.jpg)
182.9 KB26 views
Click for full-size image (P1070821_50.jpg)
68.7 KB27 views
Click for full-size image (iStar_180_F1440_test_200k.jpg)
195.6 KB35 views
Attached Files
File Type: pdf iStar_lens_cell_D180xF8_R30_Proto.PDF (82.6 KB, 10 views)
Reply With Quote
IceTrade Classifieds is a free service provided to IceInSpace members to help encourage and promote astronomy in our community.


Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT +10. The time is now 08:03 PM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.