Lens & IDAS Filter Adapters for ZWO Cameras

•September 19, 2018 • Leave a Comment

After posting my announcement yesterday, I received several inquiries about ZWO solution by same way. So I decided to make ZWO adapters in following specs.


  • Two camera adapters – M42 for APS-C or smaller and M54 for full frame
  • Light path length to be completely optimized with IDAS filter thickness – 2.5mm.

The adapter is designed for 17.5mm flange back camera. So an adapter virtually works with other brand cameras as long as they are 17.5mm flange back.

These items should be commercially available within a couple of weeks. All of ZWO cameras need to block IR by an external filter anyway. To use a camera lens, this should be the perfect solution to block IR and to capture high contrast image with IDAS LPS filter under the bright sky.




Lens/Filter Adapter for Mirrorless Cameras

•September 18, 2018 • Leave a Comment

Now following adapters are available.

Camera : SONY E, Fujifilm X and Canon EF-M

Lens : Nikon F, Canon EF and Pentax K

A pair of adapters allow you to set 52mm or 48mm filter between a lens and a camera. Thanks for the short flange back mirrorless bodies. So this is the solution for people who are looking for setting a filter behind wide-angle lenses. An extra benefit is the camera orientation.



LPS-D2-52 with SIGMA 24mm/F1.4 (Canon EF mount)


Fuji X mount adapter


SIGMA 24mm & Fuji X-T1

A pair of adapters are $219.00. Specify 48mm or 52mm. Each adapter is sold separately too. Japanese-made rigid bayonet interfaces. Tight and solid fitting at both sides.

By same way, this will work with Canon R and Nikon Z full camera too.


Comet 21P & Lunar Shot

•September 17, 2018 • Leave a Comment

Mauri Rosenthal shared his recent comet shot taken by his 55FL. Nice composing!


Comet with Jellyfish and Monkeyhead

  • Well, there’s a lot going on here. I’ve been wanting to do a more thorough job of imaging comet 21P/Giacobini-Zinner and we finally had decent skies last night. The comet was passing through a busy neighborhood. Closest is Eta Gemini or Propus, a variable triple star system which shows a considerable halo here of reddish nebulusity. To the East of this lies the Jellyfish Nebula, with only the brightest sections visible here. Then south of this grouping is the much brighter Monkeyhead Nebula.
  • mtrastronycBorg 55FL astrograph/IDAS LPS-D2 filter/iOptron Cubepro 8200 mount unguided/ZWOASI 1600MC/ Processed with PixInsight. Note that the comet tool in PI enables the comet alone to be registered and stacked, making it possible to separately process a starfield and paste a tight comet into the image. I have done that here but I have yet to figure out how to maximize the processing when there’s not just a starfield but also significant areas of nebulosity. This image stacks 10 3 minute SharpCap Live Stacks of 4 second exposures. Imaged from my yard in Westchester 10 miles north of New York City.


I tried an another lunar shot with different setup. This time, 107FL F6 and Fuji X-T1.


BORG 107FL F6 +Fuji X-T1

It was longer focal length, but it gets small image scale because of less number of pixels. I feel Panasonic GX9 seems to be more suitable for this target.


Lunar Shot with Panasonic GX8

•September 15, 2018 • Leave a Comment

This is an another my favorite camera – GX8. But I didn’t use it more than a year since last year’s total solar eclipse.


BORG 90FL + Panasonic GX8

Again a convenient camera for the lunar and solar shots.  Focused within a minute, captured, and wrapped up after several minutes. Done easily and quickly.

If Panasonic’s new sensor will be OPF CMOS, it must become the monster game-changer in the industry. It might be still too early? But I’m looking forward to their announcement.



107FL Series 115

•September 14, 2018 • Leave a Comment

Finally large format ED reducer is commercially available in Japan now and a last piece we are waiting for is a carbon fiber tube. Hopefully we can start shipping early of next month. Yes, more importantly, I understand setting prices before that.

We are preparing for two packages of 107FL F3.9ED system – a complete set and ED reducer/FTF set. The latter is for current 107FL users. Basically you will need all except the objective lens though.

Besides F3.9 configuration, I did final reviews for F6 and visual systems as well.


107FL F6, a system shows an optional filter box. 

Fortunately converting between F3.9 and F6 (and visual as well) is quite simple. By adding one more CF tube and a field flattener, it turns F6 system and much lighter because of no super reducer. You can enjoy two separate configurations – 420mm/F3.9 and 650mm/F6 with full frame cameras.

I realized 420mm focal length was a bit too short for M31 I captured last weekend. This was why I cropped my image. I will re-try with F6 system next time. That should be perfect with a full frame camera. If I will have the chance, I will try from my backyard  tonight.


Visual configuration, classy!

BTW, these prototype units show 2 x 120mm CF tubes. But the commercial system will be one 240mm.


M31 & ASI Filter Box

•September 12, 2018 • Leave a Comment

I captured these RAW frames after spending the waste of the time for taking JPEG.I wished LPS-V4 performed enhancing HII regions. I feel it somehow did as expected. Unlike Ha filter, LPS-V4 still creates good RGB color, which allows to simply stack along with HEUIBII light frames. So this is the realistic method for myself as a lady and unskillful astronomer.


BORG 107FL F3.9ED (Prototype) + Cooled 6D, 20 x 2′ with IDAS HEUIBII-52 & 10 x 3′ with IDAS LPS-V4-52, dithered by SS-one KODO/EM10

Now I think it’s the time to more seriously practice using the dedicated one-shot color camera. So I have prepared a following system. The key is a filter box, which allows to change various filters without disassembling the system and re-focusing. IDAS QC is excellent. So I don’t have to worry about the variation of filter thickness. In fact, above M31 was taken without re-focusing between two filters. I didn’t think I had any focusing issue.


Above system’s light path are carefully considered based on the filter thickness. Current all IDAS filters block UV/IR. So works as double duty.

Modified 6D Mark II & Camera Mount Sizes

•September 11, 2018 • Leave a Comment

One of Hutech royal customers – Klaus Brasch sent me his 1st light with a modified 6D Mark II. I don’t remember I have seen this kind of a close-up M8 shot before. Overwhelming!!

Here is his beautiful pictures with comments on Canon 6D Mark II.

M 8 N6559 AP155 f5 V4 Sep8_18

By Klaus Brasch

Central MW 50mm f4

By Klaus Brasch


I dipped into my astro toy budget recently and bought a new Canon 6D Mark II DSLR modified for deep sky photography by Astro Hutech. Having happily used my earlier Hutech modified Canon 6D for several years now, I was curious to see how much improved the Mark II model is. For one thing, the new Canon CMOS sensor is rated at 26.2 Mega pixels v the older 20.2. Would that make a visible difference? Second, the new camera has an articulating LCD monitor. Would that help framing and focusing and make things easier for my aging back and bones? Finally how high could I push the ISO settings on this camera without generating excessive electronic noise?

I chose two types of popular deep sky imaging methods, wide field piggy- back of the summer Milky Way with a 50 mm Canon lens at f/4 with no extra filter, and then a close up through my AP-155 f/5.2 refractor of one of my favorite nebular complexes, Messier 8 and NGC 6559, through an IDAS LPS-V4 filter. All frames were shot at ISO 6400 and each final image is a stack of 5 x 30″ to 2 minute exposures. Final processing was done with Photoshop CS 6.

My conclusions? Resolution is visible better than in the older Canon 6D, the cameras long-exposure noise reduction is very effective and the articulating LCD monitor is great for my creature comfort :).


Thanks again for sharing your recent gorgeous pictures and info on 6D Mark II performance.

BTW, I mentioned some mount sizes several days ago. So I was curious how each mount was different.


From right, Canon EF, Nikon F, Sony E and Fuji X

Nikon F and Sony E are almost same ID. But Sony has no a mirror and mirror box. So looks to me, current Nikon F mount seems to have most disadvantage especially when used with telescopes. I applause Canon they decided to change the mount from FD to EF while there were many controversial that time.

Now Nikon’s new mount – Z will be 1mm larger than EF. So I’m sure Z mount cameras will give Nikon users the huge benefit soon.

Keep in mind, all of above adapters are BORG-made. Unlike conventional T-ring, ID of telescope side has almost 50mm. I also applause BORG to have set this size long time ago.

BORG will make Z-mount adapter as well. But no need to enlarge ID of telescope side. So current all reducers and flatteners work with Nikon Z-mount camera as they are without losing large Z-mount benefit.

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