RCE Foto

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sun...

varie

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sun sent on January 18, 2013 (10:14) by Den88. 22 comments, 2336 views. [retina]

at 300mm, 6 sec f/20.0, ISO 100, tripod.

sovrapposizione di due foto del sole ottenuta tramite una lente particolare. Cosa ne pensate??



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user15434
avatar
sent on January 18, 2013 (10:33) | This comment has been automatically translated (show/hide original)

... But you make me so curious:-P: What lens did you use?
greetings and congratulations for the photo,
David

avatarjunior
sent on January 18, 2013 (10:40) | This comment has been automatically translated (show/hide original)

um ... a welding glass? : D

avatarjunior
sent on January 18, 2013 (10:55) | This comment has been automatically translated (show/hide original)

ha ha you got a welding glass attached to the target with tape (MacGyver teaches 8-)). It would be spectacular to photograph an eclipse with the glass.
thanks for the comment astrotrezzi.

a greeting
Simone

user15434
avatar
sent on January 18, 2013 (11:11) | This comment has been automatically translated (show/hide original)

... was the word "slow" to have me curious ;-). However, be careful not to look too far into the slide of the DSLR with the welding glass, since it lets the IR and long-term fry the eye [with the pupil dilated by the beautiful dark] :-P
Recommend instead the use of economic Astrosolar filters, specially designed for observing the Sun safely www.miotti.it/index.php/item/sku/27058.html (also sell sheets of A4 at a cost even lower). Or, another way, is to use the LiveView for the focus!
In any case, the effect of the Sun nice green ...
a greeting and we hope that in 2013 the Sun actually be solar maximum,
David

avatarjunior
sent on January 18, 2013 (12:05) | This comment has been automatically translated (show/hide original)

A welder's glass: D Good thinking!
It would have been nice if it had been made an overview to see also the surrounding environment, with those shades (but would no longer be a photo from astrophotography, I know: P)

I will wait with impatience to see the same photo during an eclipse :)

avatarjunior
sent on January 18, 2013 (12:56) | This comment has been automatically translated (show/hide original)

A filter welder (I think) takes on the 20-stop! : O

avatarjunior
sent on January 18, 2013 (13:02) | This comment has been automatically translated (show/hide original)

However, be careful not to look too far into the slide of the DSLR with the welding glass, since it lets the IR and long-term fry the eye [with the pupil dilated by the beautiful dark]
Recommend instead the use of economic Astrosolar filters, specially designed for observing the Sun safely www.miotti.it/index.php/item/sku/27058.html (also sell A4 size paper at a cost even lower). Or, another way, is to use the LiveView for the focus!


Hello Astro, a question, given your experience. I would like to mount a filter astrologar on my tamron 70-200, which has a frontal diameter of 77mm. What do you advise me to take from those listed in the page you lynched?

Thank you! :)

avatarsenior
sent on January 18, 2013 (13:07) | This comment has been automatically translated (show/hide original)

for the eclipse and better Astrosolar least repair radiation which the welder's filter does not make that on the whole you have to remove .... trust me I've photographed 4 of total eclipses :-)

avatarjunior
sent on January 18, 2013 (13:47) | This comment has been automatically translated (show/hide original)

Ahaha and think that today I was photographing with a simple 18-55 the eyepiece of a telescopietto fashioned (which had a solar filter) that I found in the house to shoot the sun! Even in my photos you can see those same sunspots! (Of course) what a beauty! They came a little 'blurry ... I need to improve the focus "homemade" between eye and oviettivo, but the results are not as bad as I expected: D

user15434
avatar
sent on January 18, 2013 (14:02) | This comment has been automatically translated (show/hide original)

Hello Aenea,
for a camera lens board to establish itself sunscreen taking an A4 sheet (found here ).
For Vesperwind CAREFUL THE FILTER. I hope to be one of those to be placed optics and not to be screwed to the eyepiece. In fact, in the second case we read about people who have lost or are in danger of losing his sight as a result of the rupture of the filter (see figure).



Do not ask me why filters are still on the market ... but the break is not a phenomenon so rare. Is it okay to love astronomy, but end up as Galileo Galilei (he lost his sight because of the long solar observations with a filter obviously not suitable) does not seem the case!
For the eclipse I rely on Canopo70 ... I I photographed just a total (1999) :-(
ciaux,
David

avatarjunior
sent on January 18, 2013 (14:26) | This comment has been automatically translated (show/hide original)

astro thank you very much for the information. For the next eclipse prepare myself properly (like you said better not end up like Galileo).

A welding glass: D Good thinking!
It would have been nice if it had been made an overview to see also the surrounding environment, with those shades (but would no longer be a photo from astrophotography, I know: P)

I will wait with impatience to see the same photo during an eclipse :)

nice idea! soon I will be able to photograph a beautiful landscape will make this experiment obviously not pointing the camera at the sun more 8-)

user15434
avatar
sent on January 18, 2013 (14:27) | This comment has been automatically translated (show/hide original)

... or using the LiveView ;-)
the next,
David

avatarjunior
sent on January 18, 2013 (14:34) | This comment has been automatically translated (show/hide original)

Thanks for the warning davide the filter seems to be belonging to the eyepiece .. Inside is and unscrew the eyepiece .. So even adamant. It seems that with this telescopietto you can see only the sun (unless they find other ocular)

avatarjunior
sent on January 18, 2013 (14:43) | This comment has been automatically translated (show/hide original)

img543.imageshack.us/img543/6923/schermata20130118a14373.png

imageshack.us/photo/my-images/90/fotodel5273454201245631.jpg/

these are the images

user15434
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sent on January 18, 2013 (15:40) | This comment has been automatically translated (show/hide original)

Wow ... I do not intend to "history of telescopes," but that seems like a nice tool! Maybe with diameter so small you can feel a bit 'quieter although the idea to focus sunlight onto a glass I put a bit of anxiety :-(
See you soon,
David

avatarjunior
sent on January 18, 2013 (16:31) | This comment has been automatically translated (show/hide original)

talking about telescopes: I have an "old" telescope (have a couple of decades), it would be possible to connect my camera? there is some adapter?

do not ask me more details because the telescope is in the house in the mountains, I just want to know if an experiment is feasible or not to bother leaving
Simone

user15434
avatar
sent on January 18, 2013 (16:54) | This comment has been automatically translated (show/hide original)

In principle, I would say yes ... if used eyepieces 31.8 mm in diameter (or higher) are commercially available adapters at low cost.
See you soon,
David

avatarsenior
sent on January 18, 2013 (23:35) | This comment has been automatically translated (show/hide original)

The filters to be screwed to the eyepiece can be used only diaframmando the objective to at least F15, in this way, the heat of the sun on the focal plane is reduced and the risk of breakage should be "grouted".
Welding filters (for an acceptable attenuation of sunlight should be a filter gradation "13") also exist with mirror treatment anti-IR.
They have advantages and disadvantages: first of all they are cheap, but obviously pillars are made of glass with optical tolerances bland and not very suitable for use in high resolution, so that they too generally perform best when the diaphragm a bit ' beam of light coming from the sun. May give much better results if positioned closest to the sensor (film former), as the defects of glass does not "enlarged" from the objective itself.

If you want to use acamera lens, a good compromise might be to apply a good filter ND8 front of the lens (which is not likely at all) and then find a way to insert between SLR and lens a "clipping" of welding filter. In this case I think is fine gradation "10", and many optical laboratory equipped to shape the lenses of glasses can help you with that.

Otherwise, cut the Gordian knot and you buy a piece of Astrosolar rather sensitive to handle but very effective and not so expensive.

I always remember to always exercise extreme caution with the sun, before placing the eyepiece always make sure that this does not come from an excessive amount of light!!
NEVER leave long pointed tools even approximately the sun after use, the concentrated light may causeSare also overheating of the internal parts of the optics, not always metal!

avatarsenior
sent on January 20, 2013 (11:05) | This comment has been automatically translated (show/hide original)

interesting photo ... those spots on the sun are sunspots or is it just dirt on the sensor?

avatarjunior
sent on January 20, 2013 (12:15) | This comment has been automatically translated (show/hide original)

hello Br1 no sensor is clean ones you see are sunspots
hello and thank you for passing
Simone


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