astrophotographia

[pantousis]

Exei dokimasi kapoios na foto grafisi meso to tileskopiou tou me estiaki apostasi ano ton 1000?exo 90mm/f13(1200)maksutov cassegrain.an nai ti mixani tha mporousa na agoraso mexri 150 euro gia astrofotografia?

[aristarchus]

Πάνο,

 

Αυτό είναι κάτι που έχω κάνει με εστιακή απόστασή 2465 μμ ... ρίξε μιά ματιά στο http://www.perseus.gr/Astro-Lunar-Cycle.htm ... γιά να πάρεις μιά ιδέα τι χρειάζετε, κοίτα στο http://www.perseus.gr/EquipPage/eq-access-01.jpg . Σε λίγο θα προσθέσω πολλές άλλες φωτογραφίες.

[aristarchus]

Πάνο,

 

Μην εστιάζεσε μόνο στη μηχανή .. θα χρειαστείς και άλλο αξεσουάρ. Σε σχέση με τη μηχανή, πάρε μια που σου επιτρέπει εκθέσεις πολλών δευτερολέπτων ("Β") για να μπορείς να κάνεις πλήρης τη δουλειά σου. Εγώ έχω Argus-Cosinon STL-1000, Canon A-1, Canon AE-1, Canon EOS-3 και διάφορες EOS Rebel. Αν μπορείς, παρε δύο και τρεις επειδή χρειάζονται όλες ... π.χ. τον Μάιο με την έκλειψη, είναι καλό να έχεις στη διάθεση σου όσες μπορείς ώστε να "παίξεις" με το χρόνο έκθεσης από μηχανή σε μηχανή, να "παίξεις" με την εστιακή απόστασή για συνθέσης κ.α.

[Fred Ley]

Hi Pantousis,

 

Don't forget to make certain that the camera does not require power from the battery in order to keep the shutter open for prolonged periods of time. It is fine for short exposure photography such as lunar, solar (WITH THE PROPER FILTERS), and planetary photography. The batteries are expensive and do not retain their charge as long in cold weather as in warm weather. My Olympus OM1 and Canon Ftb do not need batteries in order to keep the shutter open. My Canon A1 and AT1 do require the battery to power the shutter. I like the OM1 as it has allowed me to change the focusing screen with a flat screen (a simple procedure). The flat screen makes it so much easier to look through and focus, and it give one the same appearance as looking through an eyepiece. I also use the Olympus right-angle finder. Hope this info helps you out in selecting a camera. Yasas.

Clear Skies,

-Fred

[aristarchus]

Hi Fred,

 

I am slightly surprised you are not using a cross-hair or split focusing screen. One of the most difficult aspects of astrophotography is getting perfect focus and the split-screen focusing method guarantees one perfect focusing each and every time. One of the reasons I am a huge fan of the Canon A-1 for astrophotography is the split-screen feature. I also bought a cross-hair focuser for my EOS 3 since its standard focusing screen was not suitable for astro work.

 

Something I forgot to mention to Pano was the ability to take multiple exposures since this is a VERY important feature as well. This is quite doable with my Canon A-1's, EOS 3 and EOS Rebels but not possible with the Canon AE-1, Argus Cosinon or EOS 650.

 

As for the battery consumption, quite true but not as critical in my experience. My Canon A-1's do consume battery power for shutter functions but I would not trade them for anything. My Canon EOS 3 is quite unique in that it does not consume ANY power for extended exposures.

[aristarchus]

Fred,

 

How expensive is the right-angle finder for the Olympus? I looked repeatedly at getting one of these for my Canon A-1 and they are quite expensive. The units for the Canon A-1 also come in two types with the image reversed left to right as well as a proper orientation.

[Fred Ley]

Hi Aristarchus,

 

I find that the split-screen is wonderful for large objects that lurk in our solar system. The problem is attempting to focus on those dim fuzzies. That is where I prefer the flat screen on the OM1. It is the same as looking through an eyepiece, so that when I focus the image looking through the camera-telescope system, I know the image will be in focus. I need a manual camera for those one-hour exposures. I have had my camera on Mt. Parnis, near Delphi, have its shutter close on me when it was very cold as I was taking a guided wide field shot of the night sky.

 

If you go to EBAY www.ebay.com and under Basic Search type in "canon finder" you will see that there are currently some Canon angle finders available for sale. Some are currently around the $40.00 range. I also like my A-1 because I can also place it on full auto mode which is nice. Yes, by all means, the multiple exposure aspect of the A-1 is great. You can place a images of a planet on one frame.

 

Clear Skies,

-Fred

[cingo]

Mήπως ξέρει κάποιος άν υπάρχουν συγκεκριμένες web cam's (μάρκες ή τύποι) που προσαρμόζωνται στα τηλεσκόπια? Ευχαριστό.

[aristarchus]

Φιλε cingo,

 

Ριξε μια ματια στην ιστσσελιδα του Jon Bent Kristoffersen οπου 8α βρεις οτι 8ελεις ... http://home.no.net/jonbent/astropages.html ...

[kotsiartosstavros]

Μήπως γνωρίζει κανείς κάποιο κατάστημα στην Αθήνα για αγορά τηλεσκοπίου; Τα μόνα που βρίσκω είναι φωτογραφεία τα οποία ούτε καλή πληροφόρηση παρέχουν ούτε καλές τιμές...

Ευχαριστώ πολύ για τη βοήθειά σας.

[aristarchus]

Σταυρο,

 

Ο Νομικος στον Πειραια εχει αντιπρoσωπια της Meade. Ειναι δεκα λεπτα με το ποδι οταν βγεις απο τον ηλεκτρικο.