Tag: Olympus PEN-F

Chasing darkness in Schwarzwald

My second expedition after the dark skies (this year) led us to Germany, specifically to Black Forest (Schwarzwald) in the state of Baden-Württemberg. We rented a small cabin for a weekend and I took the same equipment which I took to Milos, i.e. telescope newton 150/600 mm, mount iOptron CEM25P and ZWO 071 Pro camera.

As soon got dark, the Milky Way showed up. I measured SQM and it reached 21.1, which is not spectacular, but far better compared what I have at home.

The equipment was working perfectly, but the dew started to form on the secondary mirror, because the cabin is close to river Breg, which means a lot of humidity. I never had dew problems with Newtonian telescope up to now. Lessons learned – I need a dew shield. I managed to capture only M74 Galaxy and M78 Nebula.

Anyway, I also managed to capture wide angle photos with my Pen-F and Fish eye lens.

Here are the star trails – exposure 30x30s:

And here is the Milky Way – exposure 1x30s ISO 3200 f1.8:

Chasing darkness in Greece – Milos

My second expedition after dark skies led us to beautiful island Milos. It’s mid-size island in Aegean see and it belongs to group of islands called Cyclades. The port and whole night life (bars, restaurants, discotheques) are located on the northern part of the island. We stayed on the other part of the island, where are empty, not organized beaches and mainly very low light pollution. To travel there is not straight forward, because Milos has very small airport. Therefore we had to fly to Santorini Island and from there take a ferry to Milos.

We found very lovely small house called Vila Kipos (AirBnB link) at remote part of the island. The place was decent for astrophotography. I measured SQM and it reached 21.3, which is not fully perfect, because the property is next to a road, and there are street lamps. However, it’s significantly better than what I have at home (SQM 19.9 – 20.4). There are much darker places on the island, but it would require batteries and to spend whole night in the nature. To photograph deep space directly next to the house, in which you stay, has significant advantages – electricity is available and the rig can photograph outside whole night and you can sleep inside.

The weather was excellent. Only two days out of 16 was windy or cloudy. Literarily, I had a deep space harvest. I managed to capture in two weeks as many pictures as during the whole last year. Initially I was bit afraid of these wires, which are in the south direction, but fortunately all the objects of my interest were above. I didn’t expect that I will manage to capture nearly all Messier’s summer objects in southern skies. Specifically, I captured M4, M6, M7, M8, M9, M17, M18, M19, M20, M21, M22, M23, M24, M25, M28, M30, M31, M33, M45, M54, M55, M56, M62, M69, M70, M73, M75, M80 and M107. Moreover, I captured NGC6822, NGC6871, NGC6888, NGC6939, NGC6946, NGC7000, NGC7293IC5146, IC1396 and B347.

We took a short walk 1 km direction west, the street lamps disappeared and SQM reached 21.5. The Milky Way was so bright that it nearly casted shadows. These are the optimal conditions to test my new fish eye lens (Olympus Zuiko 8mm F1.8 ED PRO). Focused on Mars, ISO 800, Exposure 25s.

The nearest source of light pollution direction south is Crete, which is 120 km away. Anyway, the picture could have been better and probably I should have used higher ISO. Therefore it is not going to beat the Milky Way picture from last year.

Well, it was not just about taking astrophotos, but also about nice and empty beaches, snorkeling in crystal clear water, very delicious food and in general relaxing and charging our human batteries. I miss the Greece already and I cannot wait till I will go there again.

Kleftiko beach

Kipos beach

Sarakiniko beach

Chasing the darkness in Greece on small island Gavdos

I was always dreaming about dark skies, because I live in sub-urban area with relatively strong light pollution. Two friends returned from Gavdos where they spent their summer vacation and told me that they have never seen so many stars in the sky – at that moment I was tempted. One year later I decided to combine our summer vacation (mid Semptember) with chasing of the dark skies. Swimming, snorkeling, hiking during the day and photographing, observing during the night.

We have been to Greece already, so we knew what to expect – beautiful beaches, people with great hospitality and tourists everywhere. But Gavdos is something different. It is a small island south from Crete. The island is the southernmost point of the entire European continent, which is optimal for astrophotography, because the deep space objects, which are near to the horizon in Switzerland, are 12° upper in the sky. Only few people live on Gavdos, which means there is no light pollution compared to other Greek islands. There are neither big hotels, discotheques nor organized beaches. On the other hand there are places where you can sleep and there are many taverns where you can get something delicious. Moreover in all taverns is a Wi-Fi. Electricity is mostly produced by the solar panels and stored in the batteries and some taverns use generators, so there is electricity available whole night. This means you don’t have to carry heavy batteries to power the mount or camera cooling with you.

It’s not so straight forward to get there. We flew to Heraklion (Crete capital), hired a car and drove to Paleiochora. Crete is quite big island and it took us 3-4 hours to drive from Heraklion to Paleiochora. From there we took a 6-hours ferry to Gavdos. The ferry arrives to Karaves – small harbor, where is a tavern and mini-market. Some info about the accommodation on Gavdos can be found here. We stayed at Metochi – small houses with the restaurant. The owner Maria was excellent host and she was always smiling and charged by positive energy. Every evening, when we were returning from the restaurant back to our house, we saw millions of stars. The Milky Way was so bright! I have never seen so many stars in my life. It was something spectacular.

I was thinking a lot what equipment shall I take with me to Gavdos. The telescope must be portable and has to fit in my backpack, so the Newtonian is not a good option. Refractors with slightly bigger aperture are long, therefore also not so suitable. I did the research and found interesting small reflector – 6″ (150 mm) Ritchey-Chrétien. It’s small and when I removed the focuser, it fits in my Lowepro Pro Trekker 450 AW bag even with camera, finder, autoguider and with all the cables. It has only one disadvantage – it’s quite slow with focal ratio f9. This can be improved with the focal reducer Astro Physics CCDT67. The focal ratio drops from f9 to acceptable f6. It’s still not as fast as my Newtonians, but the main thing is that it’s portable and inexpensive. Some review of this telescope can be found here or here.

Second part is the camera. My Moravian G2-8300 is an excellent camera, but together with the filter wheel, it has 2.5 kg, thus not optimal for traveling. I was searching for something lighter, with the same size of the chip and, of course, with the cooling. I found ZWO Color CMOS Camera ASI 1600MC-Cool. This camera has approximately the same quantum efficiency, but it has only 400 grams!

The last part of the gear is the mount. Here it was quite simple to decide and I purchased iOptron CEM25P lightweight equatorial mount with low periodic error and suitable payload capacity.

So, I had in hand luggage 13 kg (fortunately they never check the weight of the hand luggage) and my suit case had 31 kg and I managed to pass all security checks.

Back to Gavdos, I placed my portable astrophotographical equipment behind the house and took some pictures. Unfortunately, the weather was not so optimal. The skies were clear every night, but most of the time was very windy and I mean really very windy. I was able to photograph only 3 nights. This was quite disappointing, but I managed to capture Helix and Trifid Nebula.

Since we had a car, it was easy to travel around and every day we visited new beaches. Some of them are not accessible by car, so you have to hike an hour or two. But it’s worth it. For instance beach Potamos is one of the nicest beaches I have visited in my life and we were nearly alone there.

Beach Lakoudi is also nice and there we were completely alone.

Beach Tripiti is the southernmost place of Europe

The beaches are beautiful, but they were not the main reason why we traveled to Gavdos. To be under such clear skies and not to take a picture of the Milky Way would be shame. At the highest point of the island, there is a lighthouse – Faros. The lighthouse is not functioning anymore, but there is a museum and tavern. So, one can with the glass of wine or beer enjoy beautiful sunset.

If you stay a bit longer, the Milky Way shows its beauty. The conditions are excellent for such wide angle photography, because 200 km south there is nothing but the sea.

The picture was taken by Olympus PEN-F, lens Olympus ED 12-40mm f/2.8 PRO @ 12 mm, f/2.8, ISO 1600, exposure 20s. The crop factor is 2, which means that equivalent focal length for full frame sensor is 24 mm. This focal lenght is not so great for Milky Way, but the optical quality is remarkable. Comatic aberration is gently visible in upper left corner and there is no chromatic aberration. Well done Olympus! One of the main advantages of this camera is the weight. The camera with the lens has only 0.8 kg, which is exactly the half of the weight compare to my previous setup Canon EOS 40D with Tokina 11-20 F/2.8.

Just to conclude the post, we really loved Gavdos and we would definitely come back. The island has its own magic. It was pure relax there and I miss it. I can only recommend to everyone to go to Gavdos, not just due to the clear and not polluted skies, but also due to specific atmosphere of unspoiled nature.

On our way back we stayed couple of nights on Crete. The Moon started to shine, so I decided to take a picture of this white monster with my portable setup. Ritchey-Chrétien telescopes are not so great for the Moon or planets, due to big central obstruction caused by the secondary mirror. Some say, these telescopes are not suitable at all for this purpose. However, the picture is very sharp. I must say that it’s much better compared to pictures I made in Switzerland with significantly bigger telescopes and smaller central obstruction. This is caused by the seeing – in Greece the atmosphere is more steady compared to Swiss skies. Conclusions – it always doesn’t depend on your equipment, the nature has to cooperate as well.