IDAS LPS-D2 Now In Stock

•February 24, 2018 • Leave a Comment

It came in yesterday. LPS-D2 is the industry-first light pollution suppression filter to be designed to fight with the modern light pollution – white LED.

I did some brief comparison test after the moon was set last night, actually this morning. These were taken with ASI 183MC and SS-one ZWO capture. The capture has no color adjustment control. So each was real native color output from a camera without adjusting, if my understanding is correct.


LPS-D2, LPS-P2 & LPS-V4 (I’m not sure the order)

All are same exposure (1 minute) and gain. I pointed the scope to the worst sky from my backyard, which was Los Angles basin,

0224aNo Filter

And here is each result.

I’ve never seriously compared between with a filter and without. So I’m positively surprised how LPS filter suppresses the sky glow. Personally LPS-D2 more encourages me to use at my backyard. As expected, it looks allowing to increase more exposure at my backyard. LPS-V4 creates the darkest, which makes sense. But it is a basically narrowband nebula filter. So not suitable for broadband spectrum objects like galaxies. (Sometime I used LPS-V4 for galaxies to isolate Ha signal from others, just like Ha filter though. It worked. One day I will do for galaxies with D2 and V4)

We prepared for the LPS comparison page. (Move a cursor to each icon, so that you can see filter curves and light pollution lines individually. If icons show up below the plot, probably your browser view was zoomed-up. Please set back to 100% to view properly)


BTW, I didn’t pay attention to my backyard sky glow these years. But if my memory is correct, LA-direction WAS much more orange cast before, which probably was overwhelmed by sodium vapor. But I noticed last night, the sky was more whitish, probably mix with orange. So now I feel even LA uses white LED now, especially the business and industrial areas. Some experts should know and have data if so.

I forgot testing with DSLR. I will do accordingly.


M51 & SS-one System -Touch Screen Concept

•February 22, 2018 • 1 Comment

This was an another target I pointed to first time. Maybe too much for a small refractor.  Very hard to process!! Actually I need a large scope. Anyway this was M51 taken last night although the half moon was up there.


BORG 107FL F6 + ASI 183MC + IDAS LPS-P2-52, 30 x 5 minutes

After I start using a cooled one-shot color camera these days, I realized how much DSLR is easy to capture and process. Probably I’d better to check the gain or something. I’ve never adjusted.

BTW, I’m taking pictures almost every night these days because of enjoying. I feel so more than before. I was wondering why I feel so good. My guess is the touch panel screen. It’s very convenient in dark place. Pressing each button on an illuminated screen is very comfortable, especially for my getting-old eyes. The menu is limited. That’s fine. I don’t want to do many at the dark place.

I think this is the reason why I’m enjoying at backyard these days. SS-one system is reliable and simple to use. These are exactly what I need and like.

PC’s keyboard often frustrates me to find a correct keyboard button at the dark.  Touch screen itself is nothing special. But using it under the dark gets something special.

And friendly WiFi compatibility with a smartphone. Very nice concept, Nakazawa san!




M81/M82 through BORG 107FL & ASI 183MC, Gorgeous Southern Hemisphere Sky

•February 21, 2018 • Leave a Comment

This looks an another perfect match for FOV and focal length/sensor. I think these targets might be 1st time I pointed at. I even didn’t think of trying before. ASI 183MC camera encouraged me to do. Thanks. Yes, these are objects for big scopes. But I wanted to challenge how much I can come close with a small refractor.

Yes, stars are quickly saturated with this camera. I accepted that before purchasing. I don’t mind. Instead, I picked the resolution.

Here is my last night result. I forgot turning on cooler. But fortunately it was chilly night even in southern California. m81a

 BORG 107FL F6 + ASI 183MC + LPS-P2-52, 20 x 4 minutes

Really small targets, more tiny and faint, especially M81 than I thought.  I look forward to re-try under the dark sky. BTW, followings were my last night setup at my backyard.

One of Hutech royal customers – Fred Eiserling sent one of his Australian trip pictures. Here is his gorgeous southern hemisphere nightscape shot.

0221e Canon 6DH + 24mm lens from his friend backyard

Beautiful, Fred! I wish to be there too……

Leo Triplet with BORG 107FL & ASI 183MC, Flaming Nebula by BORG 55FL F3.6

•February 19, 2018 • Leave a Comment

I supposed to be at the dark site last weekend. I loaded all of stuff on my car and was ready to go. But I just gave up because of sky condition. Unfortunately no image result during this new moon time.

I didn’t intend to process my backyard test shot. Because of no image result, I got curious what my test shot looked like.

Here is my setup at my backyard.


As expected, BORG 107FL F6 (w/7108) and ASI 183MC was the perfect field of view for Leo Triplet. This is my primary purpose for ASI 183MC (small sensor and small pixel) as a galaxy camera. Following was only a little cropped. Just 7 frames. Obviously lack of frames.


7 x 4 minutes

I agree noisy and low S/N….. One excuse is taken without LPS filter through light polluted sky. I’m curious how a new IDAS LPS filter does for my sky and this camera. Probably that will be the best filter for this camera at my backyard.

John Ottesen in Florida shared with his recent gorgeous image.


BORG 55FL F3.6 + Canon modified T5i (3 exposures ISO 800 )

According to John, he was allowed to take only 3 frames because of sky condition. Very nice. John!


•February 16, 2018 • Leave a Comment

Now IDAS LPS-D2 48mm and 52mm are commercially available.


Here is the actual measured production data. I’m not sure other suppliers publish “measured production value”. As far as I saw, mostly “designed value”. The design value is the good hint of its filter performance. But that doesn’t describe the “actual performance” as the commercial unit we receive. So production value is much more important for us.


Sorry, this is a temporary image. Too many curves in one place. We are preparing for the more viewier-friendly version for all 4 LPS filters, which allows us to see each lamp emission separately without clicking. Please wait for that.

Following plots show how LPS-D2 works with high pressure mercury emission lines. It is not intended for thought, just for your info.


As shown above, D2 doesn’t block Mercury’s 436nm and 547nm lines. The imaging sensor has good sensitivity around this region. So if your sky is dominant by high pressure mercury vapor, LPS-P2 and LPS-D1 are still good choice for you. Meanwhile your sky is heavily polluted by high sodium vapors and/or white LED, LPS-D2 should be perfect solution. I will test and show you soon. The filter choice depends on your sky condition. Anyway, our new page makes it to see easier. BTW low pressure sodium vapor is blocked by all 4 filters including LPS-V4.

Finally IDAS LPS-D2 should be the 1st filter in our industry to be considered for the modern light – white LED. I applause IDAS to prepare the possible future light pollution now as the market leader.


IDAS LPS-D2 Filter

•February 13, 2018 • Leave a Comment

1st lot of this new filter has been set to be ready for shipment next week. Thanks all of customers for ordering already. All dealers who placed the order should receive 1st lot end of this month. So please contact your local dealers as well.

Here is part#, price and availability.

LPS-D2-48 : $189.00

LPS-D2-52 : $189.00

Above two sizes will get ready next week.

LPS-D2-EOS : $199.00

LPS-D2-EOSF : $289.00

LPS-D2-A7 : $289.00

Above 3 items are scheduled to be available in April.

As shown below, LPS-D2 effectively suppresses high pressure sodium vapor (HS) and white LED spectrum while completely blocking low pressure sodium vapor (LS) lines (589.0nm & 589.6nm).


Now we have 4 different LPS filters. LPS-P2 and LPS-D1 completely blocks LS too. They partially do HS, but not much. They were more intended to suppress the mercury vapor emission lines.  So to make things clear and simple,  now I describe each filter as follows.

LPS-D2 : LPS filter for high/low sodium and white LED

LPS-D1 : LPS filter for mercury and low sodium

LPS-P2 : LPS filter for mercury and low sodium

LPS-V4 : LPS filter for nebulae (only passing Ha, Hb and OIII)

Each LPS has pros and cons, and there is no perfect and one-piece solution. The complete solution is to simply block all of light pollution spectrum. But we lose most of astronomical photon too. So think about the best possible compromise.

BTW, the difference between LPS-D1 and LPS-P2 is


Also before I summarized each filter feature as follows

IDAS comparison

Finally following list is categorized by size/type.

IDAS specs021318

New IDAS Filter – LPS-D2 & Good-bye My SONY Camcorder

•February 9, 2018 • Leave a Comment

IDAS LPS filter were first designed as LPS-P1 in 1999. This was the industry-first multi-bandpass technology coating and really advanced design and concept that time, but isn’t obsolete even today at all. This must be still best as a broadband filter in the market. Several thousands high-end customers are currently using all over the world to improve their image under the light-polluted sky. I’m proud of providing this kind of premium quality filter into our community.

Also keep in mind, we have never had the quality issue from the beginning of the business. Nil!! That’s amazing. And all productions are so consistent in quality and performance. Very well controlled at Japanese factory all the time. I’m proud of that too! Thank you so much, IDAS and Aonuma san.

Now IDAS, a pioneer of the advanced filters, has made an another milestone in our industry, called LPS-D2. This new member of LPS family effectively suppresses high pressure sodium vapor lines and white LED spectrum. See following response curves. LPS-D2広告用0180209White LED is a new monster we, astronomers have to fight with. This is IDAS answer. This should be an another industry-first astronomical filter considered for the modern light pollution – white LED. You can see how LPS-D2 is blocking white LED spectrum.

One extra benefit is this filter reduces blue cast. See following my previous image.

0122aThis RAW image was taken with ASI 183MC without any color balance pre-setting. Probably most of one-shot CMOS cameras might be similar at color balance standpoint. LPS-D2 should decrease blue channel value, so that we can positively increase the exposure time. So I think this filter should work as UV/IR blocking filter even under the dark sky. I will test and see once I get 1st production lot.

LPS-D2 will be first available at 48mm and 52mm,  probably within a couple of weeks. Some other sizes/types are planned as well. Please stay tuned here for more details.

I “supposed to shoot” the video this morning as well. The camera was looking good and showing “recording”, and I achieved much larger image scale Jupiter finally. Adding 2nd scope was somehow helpful for the entire operation.


Now I realized there is no image data on the tape at all!! This was same tape as yesterday. I tested now. Same, no image. Probably recording head might be dead. This might be my last analog device. Good-bye oldies and thanks for letting me enjoying video shooting before. I wished to see today’s result at least since preview was looking good.

After using an old camcorder, I realize I like the consumer camera. Plan B is Panasonc mirrorless camera.




%d bloggers like this: