Olympus E-M5 Mark II with BORG 71FL

•March 25, 2015 • 2 Comments

Eventually I got Olympus E-M5 Mark II. I was very curious of their sensor-shift’s high-resolution technique, especially for high-res lunar or solar imaging. Probably it doesn’t work because of air turbulence, seeing or mechanical factor. But I will try to see anyway.  Also I was told the latest in-body image stabilizer got further stronger too.  I wanted to check.


Very nice shape! I like the body finish.


I just did the initial test with 71FL. Yes, obviously more stabilized than 1st generation of E-M5 I still have. Some good features at least for me are

- now allow to select zoom up ratio from 3x to 14x easily. 3x is more comfortable and still magnified enough to see the fine focusing during handheld shooting. 3x was what I wanted to use when I was using 1st generation one.

- Once switched to magnified mode, the stabilizer is automatically on. I don’t have to half-press the shutter button any more. This is good too. Convenient.

EVF image is still well stabilized at handheld 400mm focal length even at 3x mode. That’s amazing.

Now I feel E-M5 II is capable of making the handheld shooting more realistic and comfortable even for 71FL(400mm). 2-crop factor turns 800mm as field of view. I will play around to more practice and be ready to go to the field. Also I will start practicing handheld HD video with this E-M5 II for near future 4K video.

One day, I will test high-res mode for the sun and the moon. E-M5 II takes 8 shots while shifting the sensor, and stack to create 64MP image. I wish if the camera has the capability to align each frame. I was told Canon 7D Mark II can align and stack 4 frames. I’ve never seen the astronomical image result by that function though. Japanese magazine shows how background noise turned smooth after 4 shot stacking. So I believe Olympus can do so near future too. Pentax plans similar stacking technique too. I expect those features will be common soon.

BORG Modular Design

•March 24, 2015 • Leave a Comment

One of advantages for BORG-proprietary modular system is to allow for the easy user maintenance or improvement work. Especially users can reach each part inside after taken apart. That should be only possible for BORG. Here is one example. This white tube is 135mm long one (#7135). Originally inside tube is intended to be used with drawtube. So half portion inside has no black anti-reflection sheet, otherwise drawtube doesn’t move back and forth.  But we want to blacken there when the drawtube is removed. Here is the result.




1st image is a bit exaggerated to easily see the difference. Anyway, there is huge improvement for the image contrast.

id3Added this sheet.

If you are feeling some issue of image contrast or your image background doesn’t go dark as expected, I recommend looking into all of BORG parts inside. Some parts inside might be reflecting.

id4Basically all of BORG parts including simple extension tubes and helical focusers are well finished to minimize the reflection. This is why BORG image shows the high contrast as one of factors.

Following was my write-up about the comparison test of M57-threaded drawtube. Since M57 drawtube is not used wtih 2″ nosepiece, plain section(where generally 2″ nosepiece comes) is really issue. So all of Hutech-supplied FTF-M57 focuser has the anti-reflection sheet inside.


This good-quality anti-reflection sheet (resin-made, not paper!!) is available from Hutech. If some BORG users are looking for this, contact me or your local dealer. This is not what generally described as as technical specs. But very important for the quality of the image. And you can do yourself. This is the privilege of BORG owners!!

BORG with Seal

•March 17, 2015 • Leave a Comment

Rei Ohara – a professional wild animal photographer tested BORG carbon fiber with his 90FL under cold condition in Canada.
oharaAs expected, a tube didn’t get cold, besides lightweight advantage.

BTW, I found out some cute baby seal at one of recent pages.



This picture describes the seasonal symbols in Japan.  We feel the spring has come. Beautiful image!!

20150315_130937_1_PENTAX_PENTAX-K-571FL + 7872 (0.72x reducer DGQ) with Pentax K5 by Tobiume

Nature photography with BORG

•March 16, 2015 • Leave a Comment

One of experienced nature photographers – Ted Inoue sent me the some gorgeous pictures taken with his recently owned 71FL with 1.4x teleconverter (560mm length). Click Red-tailed Hawk picture to go to his page and try to maximize the image scale. You should be overwhelmed by natural and powerful Red-tailed Hawk. Very realistic!!
Redtail closeup

tree full fieldFuji X-E2 full resolution image (5.6MB)

This is Daurian redstart taken by the exactly same optics (71FL + 1.4x) with the different camera – SONY A77II.


Photographer : Y Kagoshima Japan


This looks very nice compact setup with Olympus camera. The picture shows 55FL with a new M57 component which will be released this month. The part works as camera rotator, smooth drawtube and mounting. This should be very useful for Mini Borg users.

90FL F4 & 71FL F4 Astrograph Sets

•March 13, 2015 • Leave a Comment

A new reducer has come in stock and now following packages are available too. These are BORG-proprietary 6-element advanced peztval optical systems.

B09040As90FL F4 set A [B09040A] : $2,695.00

1.8 kg / 390 mm

(2591 + 7150 + 7801 + 7835 + 7352 + 7872)

No drawtube, specifically configured for imaging

B09040Bs90FL F4 set B [B09040B] : $2,589.00

2.1 kg / 390 mm

(6290 + 7352 + 7872)

Drawtube allows for more versatile configurations, including visual setup with 2″ diagonal

Above picture shows 2591* + 7102* + 7753* + 7137* + 7835* + 7352 + 7872)

*parts included in 6290 set

B07140s71FL F4 set [B07140] : $1,895.00

1.1 kg / 320 mm

(2571 + 7150 + 7801 + 7835 + 7352 + 7872)

0.72x Quadruplet Super Reducer [# 7872]

•March 11, 2015 • 1 Comment

We are scheduling to start shipping the reducer early of next week. Thanks for the patience of the pre-order customers who are waiting for the one.



1. 0.72x quadruplet lens system covering full frame sensor, optimized for 90FL and 71FL

2. BORG’s 1st optical design based on F-ratio (All of BORG reducers/flatteners used to be designed for focal length)

3. Blackened lens edges (further improves image contrast)

4. Back focus distance : 60 mm from M57/female back end

Ex. 7000 – 5005 – Canon EF / 7000 – 7921 – 7922 – 5013 – Sony E



1) M48 filter, or M52 along with BORG stepping ring and BORG helical focuser at front of the reducer (Filter has to have female thread)

2) M48 filter into M57 rear adapterDSC00023ss1(Shown with 7352 – M57 camera rotator and 7519 – filter box)

And following optical systems will be available as new members of BORG astrograph familiy next week too.

90FL F4 [B09040]

71FL F4 {B71040]

Upgradeable to FTF-M57

BORG 67FL F3.8

•March 7, 2015 • Leave a Comment

67FL F3.8 is one of fastest speed and shortest focal length among BORG astrograph family.

b067038ftfsB06738, shown with an optional FTF-M57

Although it doesn’t cover full frame sensor, it achieves clean and pinpoint stars entire APS-C sensor. So it should be the best match for wide-field astrophotography with small sensors like SONY 694 and 814 chips.  BORG’s F3.8 should work like the conventional telephoto lens’s F3.3 or faster in speed. If speed, sharpness, color contrast and transparent background are important factors for you. this is the one.


Get every new post delivered to your Inbox.

Join 109 other followers