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  4. » ngc700 north america + ic5070 pelican! test 800 iso

 
ngc700 north america + ic5070 pelican! test 800 iso...

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ngc700 north america + ic5070 pelican! test 800 iso sent on June 08, 2016 (11:47) by Technophil. 15 comments, 702 views. [retina]

, Posa B f/5.6, ISO 800, tripod. San Marino, San Marino.

Primo test a 800 ISO! Mi era stato consigliato (da Ric & Beppe Reda) di alzare gli ISO e chiudere ancora di più il diaframma, per rendere le stelle più puntiformi. Ecco la prova! Curiosità: i DARK e BIAS li ho rifatti sempre dentro il frigorifero sparato al massimo, circa 0 gradi di temperatura, così li utilizzerà ancora in futuro! NGC7000 Nord America nebula + IC5070 Pelican nebula. 14x240s - f/5.6 - ISO 800 - EOS 1200D (Astrodon) - EF 50mm f/1.4 - SkyWatcher Star Adventurer - 10 DARK - 10 BIAS @ 0°c - 10 FLAT - Mac OS + PixInsight + Canon DPP 4 - 4600x3067 px. Domagnano, Rep. of San Marino, 07 June 2016.



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avatarsenior
sent on June 08, 2016 (13:37) | This comment has been automatically translated (show/hide original)

Okay close the iris but f / 4 was not enough? :-D One more thing, the dark and bias should not be played in the cold, but in the same condition in which you made the shots. In fact, if you make them light at 15 degrees even the dark will be made at 15 degrees so you have about the same amount of thermal noise. If you make them at 0 degrees will have less noise and when you go to shield them from light to steal less noise, leaving thousands more on the final photo. If even the light you made it to 0 degrees do as I had not said anything!

avatarjunior
sent on June 08, 2016 (13:41) | This comment has been automatically translated (show/hide original)

Oh I know! However, use this method after several tests, I wanted to get calibration shots that went well for a while all situations, although not optimal.
Do the calibration shots during each photo session is really boring and often did not even have time !!

avatarsenior
sent on June 08, 2016 (16:01) | This comment has been automatically translated (show/hide original)

to the test face !!! :-D Beautiful lovely !!!

user44198
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sent on June 09, 2016 (14:55) | This comment has been automatically translated (show/hide original)


avatarjunior
sent on June 09, 2016 (15:06) | This comment has been automatically translated (show/hide original)

Well of course the best possible result is obtained following the rules that we all know, but photography also means "fair compromise" ;-)

avatarsenior
sent on June 09, 2016 (18:47) | This comment has been automatically translated (show/hide original)

@Vega
certainly, I had misinterpreted the Technophil description! Peró I believe them to 0 degrees in the fridge and maybe have made the light at 15 - 20 degrees is a bit overkill as thermal delta, no? I seem to remember from the book by Comolli Cipollina that noise doubles every 6 degrees: /
I thought I had understood that with a cooled CCD is easier to do the dark because you can 'choose the temperature at which to hold the sensor during the shooting and as a result during the dark, then with the possibility to postpone the recovery. Am I wrong?
Thanks again for the tips you gave me! I deleted Erode filter Gimp from the process :-)

I typically do I do a little 'while I dismount, slightly in the car with the windows down while I go home and typically the last mentKing outlet at home :-D

user10303
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sent on June 09, 2016 (19:04) | This comment has been automatically translated (show/hide original)

In my opinion, make the Dark at temperatures so different than the Lights, it makes little sense, the person does not show typical criticality of the sky due to the excessive number of stars, but I think, if I had not done dark, or had made of dark in a workmanlike manner, the end result would be little changed. In this case I can tell you that iris closed too is disadvantageous because it will "pump" the stars but you'll catch the nebular gas.
I do not think much either reusable master, I always prefer to do it all on the field.
However, if you want to do a test, you should try to less affluent areas of stars, and evaluate the differences.

user44198
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sent on June 10, 2016 (14:55) | This comment has been automatically translated (show/hide original)

rightly Jonnycorvo what you mentioned, in fact I do not do the dark and light with that so different thermal delta ... I do not go more than 3 or 4 degrees, the dark while I was doing initially smontavo the equipment, but then doing the i saw evidence that the thermal delta refrigerator never went beyond 5 degrees difference and then exploit the more light on the field .... :-D :-D

user44198
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sent on June 10, 2016 (15:05) | This comment has been automatically translated (show/hide original)

Janx is no doubt that propose an image with dark so overly distant as temperature is not very productive :-) But I can say that I followed technique seems to give me good results ... for bias instead I noticed that even if no enter them in the calibration, the final result does not change, the limit i make flat field having built a flat box for the TSA 102, but even then i prefer to make them at home quietly taking great care not to drop the camera from the telescope by getting so the same conditions of the recovery ... also in this case, after making the comparative test with the two methods adopted ...
I always do I follow a procedure before the test, if you go in my gallery and watch the image of the double cluster in Perseus well for that image I have carried out the dark from the fridge ... tell me what you think ... and yet the field inquadrato is chock stars !!! ;-) ;-)

user10303
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sent on June 10, 2016 (16:05) | This comment has been automatically translated (show/hide original)

go in my gallery and watch the image of the double cluster in Perseus well for that image I have carried out the dark from the fridge ... tell me what you think ... but the field of view is chock stars !! [/ QUOTE ]

But I argue the opposite, namely, that the effectiveness of the dark is greater in poor star fields.
Probably, if the field is very rich, the dark could be almost superfluous, if the sky and good and makes dithering.
I believe that if a dark done at low temperatures in the house gives you excellent results, a dark place that will give you the best. As for the flat, if the sensor is not dirty, they have lost much importance now. For the bias instead, they are practically "free" but also in this case, their efficacy is marginal.


avatarjunior
sent on June 10, 2016 (16:50) | This comment has been automatically translated (show/hide original)

I thank everyone for the tips! It is always good to learn new things in order to improve the final result! 8-)

avatarjunior
sent on June 17, 2016 (10:11) | This comment has been automatically translated (show/hide original)

@ Jonnycorvo

I tried to rework the same photo with 10 dark references to about 20 degrees temperature, ie a temperature approaching that of light frames ...

Result: the digital noise of the final photo is actually smaller, but difference, however, is not as abysmal.

avatarsenior
sent on June 17, 2016 (13:39) | This comment has been automatically translated (show/hide original)

Good :)
Also consider what was said by Janx anyway! If comfort for you are still comfortable with the dark events in the fridge you can continue with those.
I do not know how you did these dark at 20 degrees, but consider that if you could take back outdoors, be greater heat exchange due to "wind". Then at the end are subtleties.

avatarjunior
sent on June 17, 2016 (13:58) | This comment has been automatically translated (show/hide original)

I made them in a locked room with 24 degrees temperature and diameter 50cm fan close to the camera! :-D

avatarsenior
sent on June 17, 2016 (18:18) | This comment has been translated

MrGreen


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