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How to upload images: Prepare the image as follows: 1.   The image should be sRGB and 8-bits 2.   Reduce the size to 2480 pixels on the longest side. (smaller sizes can be set, but are not recommended) 3.   Sharpen properly for screen. 4.   Save as JPG to your desktop, reducing JPG quality to produce 2000 kB (5000 kB for sponsoring members). 5.   In Lightroom these parameters should be set in the Export dialog. 6.   In the Forum posting or editing box, click “c
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helged

helged

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Playing with the Fornax Lighttracker II in the front-yard. S3+S24 (4x2min exposures of the sky, 1x2 min on the landscape, all @ ISO400, f4).

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helged
helged

Light from below at 60 deg N. From the Hardanger Fjord, Western Norway. S3 with S70.

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helged
helged

Arctic Ocean next: Midnight at mid summer at the northernmost tip of Norway. S006 + S35mm.

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erlingmm
erlingmm

In HK with S007, 24mm  

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hartgraef

hartgraef

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Which is the better one?

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James Simon Gallery Berlin

S 2 + S 70

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helged

helged

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9 hours ago, hartgraef said:

Which is the better one?

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James Simon Gallery Berlin

S 2 + S 70

Perhaps the colour (but I would crop off a tiny bit at the bottom, it will increase the geometry/prespective, I believe). 

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helged

helged

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A very old lady, growing just below the treeline, surviving winter storms, snow and summer droughts for a century or so. S3+S35.

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Sarnian

Sarnian

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006 + 30-90mm

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ocean2059

ocean2059

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S2 with Summarit-S 35mm lens.

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Snap Pilot

Snap Pilot

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Leica S 007 + S 70mm

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hartgraef

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S 2 +  P67  4,0/45

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basse

basse

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S2 + TS 120

extrem tilt shift und nobody can perceive it...

 

If image expectations are met, nobody asks about the technology

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helged

helged

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Sunrise at 60 deg N. S3+S35.

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basse

basse

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Am 4.2.2021 um 18:06 schrieb helged:

Playing with the Fornax Lighttracker II in the front-yard. S3+S24 (4x2min exposures of the sky, 1x2 min on the landscape, all @ ISO400, f4).

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This is a fantastic shot!
I find the technique very interesting, but I didn't understand how it is possible to expose 4x2min. Are several exposures taken and then "added together"?
Otherwise I don't know this tracker yet and thank you for the interesting hint. What is the experience with it?

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helged

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52 minutes ago, basse said:

This is a fantastic shot!
I find the technique very interesting, but I didn't understand how it is possible to expose 4x2min. Are several exposures taken and then "added together"?
Otherwise I don't know this tracker yet and thank you for the interesting hint. What is the experience with it?

Hi - and thanks! The Fornax Lightracker II is one of many star trackers around. It's not too large or heavy, its speed is very constant, and it can hold a weight (tripod head + camera/lens) of 5-6 kg (I belive). It's powered by a 12 V battery.

The procedure, irrespective of tracker, is to first align the tracker wrt to the Polar star (Polaris) on the northern hemisphere, or to the Polaris Australis on the Southern Hemisphere. For this, I highly recommend the QHYCCD Polemaster. The latter coupled to the Polemaster software/app on a pc/Mac. Once aligned, it only takes some minutes once you know what to do, one can use long shutter speeds (many minutes, often limited by the longest shutter speed of the camera), with pin-point stars since the tracker (exactly) compensates for the rotation of the Earth. A high-quality, stable tripod is needed.

In the photo you refers to, the longest shutter speed possible was 2 min (at ISO400), so I did 4 consecutive exposures, run by the body's interval timer. I also made an exposure with the tracker turned off to get a photo of the landscape without rotation.

The four star/sky images were loaded into photoshop as 'smart object', and then the 'mean' filter was used ('median' filter is also ok). This filtering removes random noise, so one is left with a very clean sky image. Finally, the processed sky image is merged with the landscape image by masking in photoshop. The latter can be a pain when trees etc. stretches into the sky. But it is possible. Other software programs/methods can be used.

Photographers into night/sky images may merge tens or even hundreds of images, and also merge images with different exposure times. In this way the dynamic range of the sensor can be expanded. Photos of the Orion Nebula are examples of the latter. See also @Jared's description/shot belwo with the SL2+SL90-280 @280mm as an example of what can be done with a tracker.

Enjoy!

 

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Sarnian

Sarnian

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007 🙂 + 30-90mm

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hartgraef

hartgraef

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S 2 + S 70

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djmay

djmay

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Cold morning in Switzerland

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S3, APO-Elmar-S 180

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Sarnian

Sarnian

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007 + 30-90mm @ 52mm. ISO 3200 f8 1/125

 

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hartgraef

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Champagne glasses #1

S 2 + P 67  2,4/105 + extension tube

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hartgraef

hartgraef

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Champagne glasses #2

S 2 + P 67  2,4/105 + extension tube

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helged

helged

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Morning sun, western Norway. S3+S180.

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