Borg / Hutech

Astro Hutech / Borg: Another Veil thru NB1

1- This was a 1st test shot by Scott Denning in Colorado under the moonlight.


His comment : This is an experimental image of the Veil in Cygnus using NB1 filter with OSC camera (ASI 094MC Pro). About 2 hours exposure (25x300s) with Borg 125SD @ f/3.9 during waning gibbous moon in my suburban back yard the past two nights. Flats and darks applied, then processed in PixInsight.

It took a lot of work in PI to get the color balance to be pleasing, but I am very happy with the result. The NB1 filter works very well to isolate Ha and O3 under bright moonlit skies!

Thanks for your quick feedback on NB1. Enjoy with a new filter. Scott, when I used NB1 with my 183MC last time, I pre-set white balance – red – 96 & blue – 88. It might not be the same for 094MC. But I thought it might be useful for your next attempt.


2- I also resumed astro activity. This might be 1st time to take gear outside almost in 3 months. Fortunately now I can carry some portable mounts and scopes after foot and back injuries. Still a bit hesitating though. I missed a lot of summer targets this year.


This was my 1st attempt to test CFW with a color camera under the sky. Unfortunately I was forced to be washed out by the marine layer quickly. But at least I figured out each filter was switched as expected from PC. So this was the good to start anyway.


IDAS filters are set as follows

From top : NB2-48, NB3-48 and ODW(clear)-48

From top : NB2-48, NB3-48 and ODW(clear)-48

Astro hutech: Sightron-Japan’s Super Solid CF Tripod


I don’t hesitate to express this is the best portable tripod I’ve ever touched and owned.

Sightron Japan introduced the super solid and lightweight carbon fiber tripod to our community. It will be available thru Astro Hutech in US soon. I brought a sample with me from Japan last week.

11-layer and 40mm/36mm diameter CF tubes are the key components for the stability. I think these numbers are quite large – larger than most of premium brand carbon fiber tripods in the market. Take a look at this comparison.


The left one is Sky-watcher standard tripod. According to my measurement, it was 44mm diameter. So you can see how 40mm is big as CF legs. And the joint sections are well solid too. I forced to twist legs. But barely flexuous. Nothing worried at all.

And with various adapters,  this should be more than $1,000 values if compared with others in my opinion. See the beautiful machining finish as below!


Here are setup with my mounts. Bigger mounts like EM10/11 are still no problem.


Specs are

  • 2.1kg

  • 140mm to 830mm high

  • 11-layer 40mm and 36mm diameter CF tubes

  • 30kg load capacity

  • Independent leg spread

  • Adapters : 3/8″ or 1/4″ and Sky-watcher EQ5, 3, EQM35 & some others like Vixen

US price : $499.00

Quick release adapter is well machined, snap-on and smooth release. Very pleasing touch.

Yes, this is the ultimate portable tripod highly recommended to the serious astronomers.

Borg:- CFW with OSC Camera & IDAS Nebula Booster I, II & III


Believe or not, this is my 1st CFW. I’m a lazy astro photographer. Always seeking for the easy way. So no monochrome choice came up my mind before.

But this is different. This CFW will be used for one-shot color camera with IDAS Nebular Booster.


This allows to change IDAS NB1 to 3, and ODW(clear) for broadband color from PC. This should make narrowband & broadband imaging with one-shot color camera more convenient and joyful.


M48 mounted are scheduled to come up by end of this month. This should be good up to APS-C sensor.

A glass size of M52 is 49mm. So if your carousel allows to set 49mm unmounted, that’s possible too.

IDAS Drop-in Filter System for Canon R(P)

by Hutech Borg

As announced before, IDAS drop-in filters for Canon R(P) are now commercially available.

Canon RP body & drop-in filter adapter, IDAS NB3-DR & Sigma Art 50mm/F1.4

Canon RP body & drop-in filter adapter, IDAS NB3-DR & Sigma Art 50mm/F1.4

Canon genuine filter adapter allows to electrically control a lens. So doesn’t require the trick of manual aperture control.

And IDAS filter thickness is exactly same as Canon original. So there is no image distortion issue due to the incorrect optical distance. Especially it is very critical for wide-angle lenses.


Most likely this is only way to use narrow-band filters with wide-angle lenses without removing a lens from a body.

3 kinds of filters are available.

  • NB2-DR (for OIII-Ha)

  • NB3-DR (for OIII-SII)

  • ODW(clear)-DR (for broadband)

These filter system allows to create 1) broadband image thru ODW, 2) OIII-Ha thru NB2 and 3) OIII-SII thru NB3 while controlling conventional lenses without compromise.

I will try to shoot the milky way ASAP. My favorite will be to set NGS1 body-mounted filterinto the body and use 3 filters in-between.

You can see each item at e-store


Ready to go!!!!

IDAS NGS1 & Dual Narrowband by BORG 90FL

1- I got the feedback from “AstroBackyard” on IDAS NGS1.


Facebook Users


Personally this is my most favorite broadband filter at this moment because the color balance looks as good as HEUIBII and suitable for my backyard sky glow.

See my previous write-up at

Keep in mind, this doesn’t mean NGS1 is always the best choice for all of users. Sky glow is not same. But at least I can say NGS1 is good selection to modified DSLR users who are looking for the filter which blocks the light pollution while maintaining the background color balance like HEUIBII does.

2- A serious BORG user – Steven Bellavia shared his recent dual narrowband image.

Thank you, Steven all the time.

Filter Box for DSLR by Astro Hutech / Borg

Filter Box for DSLR astro hutech borg

This is to share with DSLR users who are seeking for the solution with new F3.9 scope systems along with a filter box.

I wished to use my lovely noise-free cooled 6D with IDAS NB2 and NB3 last time. But no room to add one more filter box in front of a camera. So I was forced to use a mirrorless camera like SONY A7.

Now I tried to figure out the solution for coming new moon opportunity. Here is my answer for DSLR users.

  • Remove M57 rotator (7352)

  • Replace 7000 with 7923

Astro Hutch Borg

This gives us 18mm new room. Yes, unfortunately we lose a camera rotator. So inconvenient for the time being. But just temporary. Don’t worry, I start preparing the large rotator indicated the above.

BTW, new rotator is large enough for 55mm diagonal sensor such as GFX or Pentax 645 camera.

As described yesterday, IDAS filter makes light path 0.85mm shorter. To meet the correct back focus requirement of BORG, we need to “mechanically extend” 0.85mm to “offset”.

2 x 7879(2mm) is the answer. I’m glad it was much simpler than what I expected.

BORG BF is 80.00mm as designed. 80.85mm with IDAS filter(=80.00mm light path thru a filter)

80.85 – 55(44 as Canon + 11=5005) – 15(7519) – 7(7507) – 4(2×7879) = – 0.15mm

0.15mm is too long. But I’m sure it should be within the tolerance. And from the viewpoint of general BORG optical behavior I experienced before, longer looks relatively better than shorter.

And once a new rotator will come up, you can simply replace a current rear unit with it without changing other parts configuration. Then, you can orient a camera body while using a filter box.

Astro Hutech Borg

Nikon DSLR is same thing. Just replace above 5005 with 5003. That’s it.

If your camera has IR blocker inside body, you can use NB2 and 3 alone. No extra filter needed. My 6D has a clear filter inside body. So I need to have 2 filters. I hope not to be confused.

For more info, please click here.

Veil Nebula with IDAS and BORG


Followings are the cropped close-up versions in full resolution mode.


All light frames were simply stacked. More experienced users should split into RGB individually and create AOO or Hubble Pallet or something else. I will learn that from now on.

I feel the image sharpness might be affected by seeing or the temperature change during the imaging session. Even my 75mm guide scope showed poor seeing.

I wish to use my lovely cooled 6D. But so far, there is no room for one more filter box at this moment. This is why I shot the above with A7. I need the special arrangement for that.

IDAS Nebula Booster #2 and #3


IDAS NB2 and ODW filters are expected to come in stock next week. (NB3 will be later) Each US price is as follows;

  • NB2-52 : $219.00

  • NB3-52 : $219.00

  • ODW-52 : $89.00

Each is only available at 52mm. No plan for other sizes as regular round-mounted.

This is IDAS’s new filtering “system” for one-shot color cameras to maximize the nebula emission’s S/N while capturing regular RGB broadband colors without re-focusing or taking apart the optical system during imaging session.

While NB1 performs alone, NB2 and 3 requires a base filter since they don’t block NIR themselves. But don’t be disappointed. I explain why…. Following is one example.

Base filter : NGS1 is the best match with NB2 and 3. But regular UV/IR blocking filter may be used too. IDAS LPS or NGS has still good advantage if the sky is light-polluted.

  1. For regular RGB color : ODW (as FMC full spectrum filter)

  2. For narrow-band nabula : NB2 or NB3

And blending in post processing.


Conventional 48mm UV/IR blocking filters can be set with 52-48 stepping ring as a base filter. But be sure Hutech adapters (for M42 for APS-C or smaller and M54 for full frame cameras) are optimized for IDAS filter thickness. You need to adjust the mechanical distance when non-IDAS filters are in place.


NB2 for OIII, Ha and NII

NB3 for OIII and SII

Again, as always, each emission line is intentionally set at shorter wavelength side and the transmission peak is the flat-top shape to minimizing signal loss after the spectrum shift. Very well designed as usual.

BORG with Eagle 3


I just setup PLL’s Eagle 3 with BORG 90FL F3.9ED and 50Ach guide scope. Fortunately I could figure out matching Eagle 3’s hole patterns with BORG 3200 plate.

ll look nice and great color matching, and everything is solid.


Again, Eagle 3 is not just a compact Windows PC. I think the power distribution capability including dew-heater power controls should be more valuable and convenient. I have to ship them out to NEAF today. So I will write up more after coming back.