Two new filters awaiting first light

[riklaunim]

So it's raining and I can only post pictures of new filters, not images taken through them Two industry/scientific filters bought from UQG (Optics) Ltd. Optical Components & Technical Glasses Manufacturer - Hoya 340 (UV) and RG-1000. 25 mm dia fitted to slightly modded 1,25" filter cells of those cheap SW/Celestron moon filters (made from hard plastic). Both are black and only Hoya shows something when looking on a light bulb

RG-1000

Passing from ~1000nm til near infrared. Mainly for Venus (night, day side). Cheap. More specific for Venus night side window at 1010nm cost much more (~150 EUR for Asahi longpass 990, 230 EUR for 1010nm narrowband - 10 nm filter from Eureca). Will be also used on gas planets if sensitivity allows.

Hoya-340

UV filter, for Venus and other planets. This one is quite unique as it doesn't nearly leak IR so no IR blocker needed I thinkt.

25 mm dia is some sort of a standard for "industry" filters, and they are almost like 1,25" filter so they should illuminate most of the CCDs, even 2/3" or alike. Except those two above there are many other filters that could be adapted for astronomy - narrowband 890nm methane filter, or narrowband filters for DS imaging in He,Ar,Ne,Cl bands Look at:

Eureca Meßtechnik GmbH

Optical Filters - Edmund Optics

Optical Filters - Asahi Spectra USA Inc.

[angusb1]

This is really interesting, can't wait to see what images you take with these.

[johnh]

I bought 1000nm filter for £10 from Ebay and will use it for darkside Venus, it works suprisingly well on the Moon too but won't pass any light at all, even a laser won't go through it.

John.

[riklaunim]

I've managed to do some initial test of RG-1000. Clouds prevented full set of images for RG and Hoya... maybe today

RG-1000 is brighter than narrowband 10nm methane band filter (the planet appears bright). Didn't checked that yet, but at 1 sec exposure I get more than double histogram fill with RG-1000 than with methane filter. Jupiter looks bright like with standard Ir-Passing filters, but some structures seems to be white than dark like in Pro Planet. More images needed to compare Look at the white spot in north polar region (north down) and some white stripes close to the equator on the RG image.

Although it's 1 sec image it did sharpen very nicely with deconvolution. With better camera and more frames it could interesting addon for Pro Planet images.

All images taken with DSI III Pro with SCT 8" at f/10. RG-1000 and methane band images with bin2 (and drizzled 150% for the bigger set). Focus set with Bahtinov mask on a Jupiter moon.