BORG 107FL Bino 1st Light for Jupiter

•June 24, 2019 • Leave a Comment

Probably this becomes my ultimate visual observing system in my life span. I’m still suffered by the marine layer. But I had only one hour chance to point to the sky last weekend. This turned my 1st astronomy activity in this month.

The Jupiter was still very low . The sky was poor transparent and terrible seeing. But at least I could observe the Jupiter thru BORG 107FL. The clouds came in before Saturn was coming up.

I think eventually I have reached the goal I was aiming at.

  1. Just a bit tweaking mirror collimators, 250x two images were perfectly merged together. Thanks to the BinoTechno precision body. No-worry about the initial alignment at all. Very good for a lazy man like me.
  2. Vixen HR eyepieces showed very comfortable view at 250x. I’m sure still bright enough for the Saturn.
  3. iOptron mount was tracking very smoothly. There was no bumpy motions at all. As advertised, the micro-step drive should work out well. Electronics with GPS was smartly pointing the target and accurately tracking. Simple initial calibration allowed to keep the Jupiter at the center long time at 250x. Very good mount. I like it!
  4. So everything is what I was expecting.

BTW, these are my favorite eyepieces for BORG Bino.


2″ Masuyama 26mm shows pin-point stars entire field of view. I’m not a big fan for wide-field though. This should be a nice wide-field eyepiece for the short refractors like BORG. And Vixen HRs let me observing comfortably at high power. I don’t feel looking thru such a short f.l. at all. Bright and high eye-point is very nice.

I wish to have the clear night sky soon.





BORG 107FL Bino

•June 20, 2019 • Leave a Comment

Finally I’m ready for high power binoscope viewing. The mount looks steady as expected. 3-level knobs are nice. Very convenient. And rechargeable battery is in the body. That’s good too.


With Vixen HR 2.4mm, it turns 250x. Looks nice!  Now the showtime for the planets.

My backyard is still covered by marine layer every night. No astronomy this month yet…..

IDAS Nabula Boosters To Be Used With Monochrome Cameras

•June 18, 2019 • Leave a Comment

IDAS Nabula Booster I, II and III were originally designed for OSC camera. But as I mentioned earlier, they could optically work with monochrome cameras as well. One of Japanese serious astronomers – Uto-san tested already.

Here is the link to his blog (under his permission)


1st shot was taken for Ha thru NB2 and red filters. 2nd were for OIII thru NB2 and green. And color image was done as AOO. According to Uto-san, the moon was about 60% illuminated that night.  So the image contrast, especially for OIII seems to be affected by the moon light. But still looking very clean shot!

NB2 and 3’s key advantages are;

  • Cost effective as narrowband filter in its size and quality – $219 at 52mm
  • Double-duty, Ha and OIII thru one filter. So $110 per channel.
  • Flat-top transmission peak to avoid the signal attenuation
  • Moderate bandpass, suitable for fast optics

So at least having one filter, you can take both individual emission lines – Ha and OIII, or SII and OIII (by NB3).  For regular RGB imaging, switch to a IDAS par-focal clear filter instead.

Today’s CFW is low-profile mechanical design. So I believe it still allows to add an extra part for one more filter in-between.

Nice try, Uto-san. Thanks for sharing.






BORG 90FL F3.9 & 107FL F3.9

•June 17, 2019 • Leave a Comment


Finally we are ready to take an order for BORG 90FL F3.9ED. Sorry to have kept you waiting long time. As described, the promotional price is valid until July 19th.


90FL has a plenty of illumination entire full frame sensor (82%), even in 645 sensor (77%). This should relatively ease creating the flat.



Also current 107FL F3.9ED price will end as well at same time. There is no extension for both of them.

107FL F3.9ED : $3,995.00 -> $4,595.00

90FL F3.9ED : $3,495.00 -> $4,195.00

Don’t miss this special chance to get the premium quality optics in promotional period.

And this is a key part to convert to visual and F6 configuration with 7108.

8070 : CF tube 70mm long

Various configurations from 107FL F3.9ED and 90FL F3.9ED

AOK Swiss Binoscope System

•June 16, 2019 • Leave a Comment

AOK Swiss – Beat Kohler, my long-time partner and a pioneer of binoscope platform seems to carry a new platform.


I was told he tried to make two BORG 107FL onto Meade LX-90 8″ mount although there was barely extra room. I didn’t know after that. But he looks “he made it”. Congratulations! Beat, and very nice setup. This should be perfect 4″ plus bino. Always double-fork mount is the winner in stability, and motorized tracking for high-power planetary viewing.

For more details, please contact AOK Swiss. He is a bino platform master.

At same time, I added more bino-related component items.


These are mostly good for non-BORG bino as DIY project.


Hinode Solar Guider & BORG 55FL

•June 15, 2019 • Leave a Comment

1- We shipped last units of  solar guiders mainly for the next month’s total solar eclipse demands yesterday. Universal mounting bar has been sold out. But Woodland Hills or OPT should have in stock. Please contact them for rush orders.


With iOptron SmartEQ mount. This might be most portable autoguide-capable dual-axes mount, which should be good enough unless affected by wind.

As mentioned earlier, Mercury transit will be coming up this November, and we can enjoy usual solar activity animation. So Hinode SG will be continuously useful in our lifetime span, not only special occasions but also on daily basis.

2- We began shipping BORG 55FL objective lens. So prime focus or visual configuration is now available. But 0.8x super reducer doesn’t come up yet. I believe it should be close. But I can’t get the clear answer on the schedule from BORG. It’s shame. So I’m now considering some special loaner units to the customers who are still waiting for F3.6 system long time.  Customers and I can’t stand any longer. So I decided to take a specific action on behalf of BORG. Generally they should do that!!


This is F4.9 system. At least this setup reaches the focus at the infinity and allows for easy conversion to F3.6. But I’m not sure how large it covers. My goal is for APS-C sensor. If star test will be OK, I will prepare for some systems as the temporary solution, as the courtesy of Hutech.

I hope the marine layer won’t come in tonight……

I don’t expect any particular response will come up from BORG until middle of July, when the new management will be in place.



IDAS Filter System

•June 13, 2019 • Leave a Comment

I just prepared for IDAS imaging system for my own use. Probably this double-stacking system will be my default for a while, regardless of one or two filters.


Personally I’m still quite comfortable for using a consumer camera for 1st trial purpose. So I just setup with a modified SONY A7 first. I will try to use ZWO camera later. Thanks for the short flange back mirrorless camera, which allows me to set two filter boxes in-between. Adding 1mm spacer, the light path turns perfect after two filter’s refractive correction with my no-filter A7.


With BORG 72FL F4 (prototype)

Clockwise from upper right, NGS-1, NB1, ODW(clear) and NB2. What I can do with these filters are;

  • ODW + NGS1 : broadband color under the light polluted sky
  • NB2* + NGS1 : dual-band color (Ha and OIII)
  • NB3*(when comes in) + NGS1 : dual-band color (SII and OIII)
  • ODW + NB1 :  tri-band color (Ha, OIII and Hb)
  1. *NB2/3 must be set in at the objective side.
  2. NB1 performs alone. ODW is just in for the par-focal. All are 52mm sizes. So large enough for full frame sensor.
  3. NGS1 and NB1 may be replaced with others like LPS-D2 or conventional UV/IR blocking filters. I have just picked NGS1 since it seems to be suitable for my backyard sky.

These Marumi filter case allows to set a filter holder itself. Very convenient. Probably now I need to label on each case, or I’m sure I set a wrong filter at the dark site.

Now ready to go. I’m excited about that!




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