Pleiades or Seven Sisters (M45) Open Star Cluster

cloud_cover · Post by **cloud_cover** » Wed Feb 09, 2011 1:47 pm

I thought diffraction spikes ususally start to happen after you stop down well above f/11. f/8 seems rather wide for these spikes. Odd.

orly_andico · Post by **orly_andico** » Wed Feb 09, 2011 1:51 pm

kevin

i've seen diffraction spikes even at f/3.2 (on an f/2.8 lens). really depends on the configuration of the iris.. if there are any "sharp" corners on the iris, you'll get spikes.

kensou · Post by **kensou** » Wed Feb 09, 2011 2:00 pm

ownself use smudge tools and pull out a few spikes

fizzy123 · Post by **fizzy123** » Wed Feb 09, 2011 2:35 pm

Well, I heard that the traditional way of creating spikes in astrophotos for people that are using refractors, they usually paste 2 pieces of thread infront of their object lens, to create the spike effect. For newtonians, there isnt a need as the spikes are created by the spider vanes

Strangely, while some ppl like spikes, some ppl really don't like them and consider them as flaws in their pictures

Post by **rcj** » Wed Feb 09, 2011 5:57 pm

i love the spikes! looks pretty!

Post by **weixing** » Wed Feb 09, 2011 7:48 pm

Hi,
I also like spikes... My R200SS Newtonian got very thick secondary spider, but the diffraction spikes generated is very thin and look very nice... but the spikes here is a bit too "thick"... look like starfish leh.... [smilie=crying3.gif]

Anyway, I think I'll shoot at F5.6 and use the thread trick next time... [smilie=cheer.gif]

Have a nice day.

Zephyrus · Post by **Zephyrus** » Wed Feb 09, 2011 8:06 pm

Hehehe, there's always something called Cross Screen filters (or star-six and star-eight).

http://www.hoyafilter.com/products/hoya/oef-03.html <-- I bought the cross screen filter myself, got it cheap at $25 off ClubSNAP. Hehe.

Weixing, when are you going to take your next shot at this? Maybe I can drop by Tampines with my 7D. Hehehe.

timatworksg · Post by **timatworksg** » Wed Feb 09, 2011 8:10 pm

I kinda like variable spikes....large spikes on the larger stars and smaller ones on smaller stars! But not too many! Thats where PS layers and layer mask come in handy,...hehe!
I read somewhere where someone used his daughters hair and taped them in a cross on a lens hood! Hmmm...where are my daughters!! HAHA!

wintertriangle22 · Post by **wintertriangle22** » Wed Feb 09, 2011 8:18 pm

Nice capture of Subaru aka Seven Sisters aka Pleiades [smilie=admire.gif]

Enterprise · Post by **Enterprise** » Thu Feb 10, 2011 4:22 pm

Hi weixing nice capture! Spikes look abit weird to me but to each his own i guess!

Each 2 min exposure in post editing you had to process for field rotation in each frame?