April 2018

[Fons Baerken]

Great respect for peoples' contributions to this thread

[John Geerts]

A night full of rain and a shy sun in the morning

Df  300/4.5 ED - PN11

[Birna Rørslett]

The end of an era.

[Fons Baerken]

April 15



D500, 35-200mm f/3.5~4.5

[Frank Fremerey]

Great respect for peoples' contributions to this thread

Especially to you & John, who are the most continuous contributers by far!!!

[Frank Fremerey]

Today I went on a phototour with the editor of our church gazette, to search for pictures in our quarter fitting the "garden"-topic. (  )

I took one thinking of a certain picture Fons posted a while ago, so a "tribute to Fons"

[Frank Fremerey]

The end of an era.

Are you 100% female now or still "beyond definition"? End of an Era sounds like "End of a long transition" to me...

[Birna Rørslett]

Just as you surmised.

[Bent Hjarbo]

Especially to you & John, who are the most continuous contributers by far!!!

+1

[golunvolo]

+1

+ another 1

  Thank you for your creativity, dedication, generosity

[armando_m]

coming here is always like opening a present , what wonderful images will I find ? always something interesting

here is a bit of stubbornness from my part, taken just 1 hr away from home, nice beautiful clear skies, iso 1600, 70-300mm zoom at 300mm, 20x1min exposures
large crop , lots of Nr

[Bill Mellen]

Beautiful!  Something I have always wanted to try Armando.

[Hugh_3170]

Well Armando, your stubborness has paid off handsomely - a splendid image.  A bit like good footballers making their own luck I guess. 

I notice here that you have combined twenty 1 minute exposures. 

Whilst I understand the benefits of signal averaging over multiple images and the benefits of letting the sensor cool down in between exposures, do you also do any other noise reduction things such as dark side subtractions where exposures are made with the lens cap on?

coming here is always like opening a present , what wonderful images will I find ? always something interesting

here is a bit of stubbornness from my part, taken just 1 hr away from home, nice beautiful clear skies, iso 1600, 70-300mm zoom at 300mm, 20x1min exposures
large crop , lots of Nr

[armando_m]

Hugh , Bill, thanks for the comments.

Yes there are "dark" frames, these are taken with the same exposure of the "light" frames but with the lens cap on, I took 8 of these. There are offset frames, taken also with the cap on, but at the fastest shootung speed 1/8000, same iso as the other 2, finally there flat frames, correct exposure of a clear surface , these are used to correct vignetting.

The resulting stack created by deepsky is saved to a tif, I save it in 32bit mode, then use acr to convert it to 16bits, and ps to complete the processing.

[Øivind Tøien]

Yes there are "dark" frames, these are taken with the same exposure of the "light" frames but with the lens cap on, I took 8 of these. There are offset frames, taken also with the cap on, but at the fastest shootung speed 1/8000, same iso as the other 2, finally there flat frames, correct exposure of a clear surface , these are used to correct vignetting.

The resulting stack created by deepsky is saved to a tif, I save it in 32bit mode, then use acr to convert it to 16bits, and ps to complete the processing.

Great colors and tones in this one Amando, thanks for posting!

Do you use the autosave file or the active save of the TIFF file, and in the latter case with or without embedded edits?

In case you or anyone else have not discovered: Deep Sky Stacker is now open source. The development team has released version 4.1.0; for the first time it comes in a 64 bit version, which has some speed improvements, and the memory space does not have the 32 bit limit any longer. (Watch out for memory limits in your editing program if you use 2x or 3x drizzle at full size though). I have seen comments that it handles colors better too.