http://www.howardastro.org/gallery/t...leiades?full=1

I finally caught some nebulosity (faint blue--not to be confused with chromatic abberaton, the brighter blue).

Todd

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Todd (Bowie, MD, US, North America, Earth, Sol System, Vega region, Local Bubble, Orion arm, Milky Way Galaxy, Local Group, Virgo A Cluster, Virgo supercluster, the universe in which spock is clean shaven)

Quidquid latine dictum sit, altum sonatur.

personal page: http://blog.astrosketches.info

It blows me away! Your compositions!
Really beautiful!

thanks for sharing

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clear skies

If you want to make an apple pie from scratch, you must first create the universe. CARL SAGAN

Mak: Pass the pepperoni please.
Fazor: "Hail, Bautainia! We pledge our hearts to thee! Science and woo, some babbling too, and astron-oh-meee!"
slang: And it made ash out of yew and tree.

Lovely and crisp. Thanks for sharing.

Kind regards
Matt

Awesome!

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Very nice Todd! How did you produced the eight pointed stars looks nice. Clear Skies

8-points---something about the camera is all I know; maybe the iris is an octagon.

Todd

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Todd (Bowie, MD, US, North America, Earth, Sol System, Vega region, Local Bubble, Orion arm, Milky Way Galaxy, Local Group, Virgo A Cluster, Virgo supercluster, the universe in which spock is clean shaven)

Quidquid latine dictum sit, altum sonatur.

personal page: http://blog.astrosketches.info

Thanks Todd fo r the info.

Very nice! Gosh, I love the Pleiades.

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thank you muchly, i've been meaning to find a photo of the seven sexy sisters

Foote

Wow!

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None to speak of

An excellent effort. May I ask why you're using f/8? Is the lens too soft below this?

clop

I thought I'd reduce the vignetting, but it seemed to make little difference. I guess it would make a bigger difference for a wider field, though.

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Todd (Bowie, MD, US, North America, Earth, Sol System, Vega region, Local Bubble, Orion arm, Milky Way Galaxy, Local Group, Virgo A Cluster, Virgo supercluster, the universe in which spock is clean shaven)

Quidquid latine dictum sit, altum sonatur.

personal page: http://blog.astrosketches.info

Since your subject is usually in the centre of the image, and since vignetting really affects only the sides and corners, it shouldn't cause too much of a problem. Do you know how to make a flat field by taking flat lights (and flat darks)? Applying a flat field completely removes the effects of vignetting no matter what the optical train, though you do lose some sensitivity in imaging around the edges. Changing from f/8 to f/5.6 will allow you to halve (and to f/4 to quarter) the exposure time of your subs - very handy when you're working at ISO1600 and your tracking system isn't ideal.

clop

I've read the procedures for flat fields, but I have never actually put them to the test.

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Todd (Bowie, MD, US, North America, Earth, Sol System, Vega region, Local Bubble, Orion arm, Milky Way Galaxy, Local Group, Virgo A Cluster, Virgo supercluster, the universe in which spock is clean shaven)

Quidquid latine dictum sit, altum sonatur.

personal page: http://blog.astrosketches.info

Great start. Keep going -- more exposure time or take a series and stack. This exposure is affectively 300sec (5 min). Do it again, and again, and again. Try to get at least 30 -60 minutes total exposure time and you'll see that nebulosity pop right out!

Again, great start!

Tom