Seven Sisters.

[tilbrook@rbe.ne]

Time to visit the sisters again.

Gradually working out how to process them, quite a delicate balancing act.

Equipment used.
8” F/4 astrograph , baader type coma corrector,. HEQ Pro 5 mount, orion mini guider.
Camera.
Unmodded Cannon 1100D.

11 x 8 minute subs ISO1600, darks, flats and bias frames applied.
Stacked in Deep Sky Stacker .Processed in Photoshop 7 and Olympus background tool.

Cheers,

Justin.

[multiweb]

Nice one Justin. Got some cool neb details. :thumbsup: Your spider vanes might need a little squaring.

[tilbrook@rbe.ne]

Thanks Marc!

Yep those vanes are a pain in the rear end!!

They twist with the change in temperature, the night before they were fine. I need to make some new ones out spring steel.

Cheers,

Justin.

[multiweb]

You just need to re-center your secondary and center it so they're square.

[tilbrook@rbe.ne]

A little confused??

Can't see how you can centre the secondary when it needs to be off set, especially with an F/4 scope.

It's more twist in the vanes than position, that's my problem.

Cheers,

Justin.

[multiweb]

Twist will make them thicker by not separate. You don't need to offset your secondary that much with the 8" F/4. Your vanes are bent. All four of them.

[astronobob]

Nice Neb capturing Justin, done very well i think, , Try using a straight edge against your spider veins, like, right accross the front of scope, stand back at arms length, might help see whats going on, or they might just need a tad more tension on them ? :thumbsup:
Rgrds mate !

[Rex]

Nice job Justin. Fantastic stringy detail in the nebula.

[stevous67]

Hi Justin,

Nice image, but Marc is right. This is not temperature dependant, the spilt defractions are the result of the spider vanes not being perpendicular. I have an extact for you, see the attached [the reference to the secondary being centred is for the CDK, you need the offset].

How to fix, if you are sure your offset is correct, then you need to make new holes in your front ring, to get the vanes 90 degrees to each other.

Looks great otherwise.

Steve

[Irish stargazer]

Beautiful. One to hang on the wall.:thumbsup:

[Larryp]

Nice one, Justin :thumbsup:

[kinetic]

Beautiful set Justin!

FWIW , just to add to the spider vane discussion, here is the same
effect on one of my shots:
http://www.iceinspace.com.au/forum/showpost.php?p=926150&postcount=1

Definitely caused by non-symmetrical vanes, (2nd shot shows no assymetry)
-same target.
As for spikes in general...I love spikes on Pleiades shots!

Steve

[RobF]

Interesting shot Justin. Nice work!

[Ross G]

A great looking Pleiades photo Justin.

Beautiful colour and I like the way you show so much faint detail.

I love the composition.

Ross.

[tilbrook@rbe.ne]

Thanks Marc!

Yep, I take your point.



Thanks Bob!

Good tip, Ill give it a go.



Thanks Rex,

A lot of stuff to process in M45.



Thanks Steve!

Yep your right of course, checked my offset it's 3.2mm which is on the money.
Just need to deal with the vanes.



Thanks John!



Thanks Laurie!



Thanks Steve!

Lot's of good info!



Thanks Rob!



Thanks Ross!

Takes a while to tease out every last bit.

Cheers,

Justin.

[strongmanmike]

Good capture there Justin, I too recon M45 needs spikes (even double ones), refractor images of it just don't quite have the same wow factor :thumbsup:

Mike

[naskies]

Nice capture, Justin. Good luck getting the vanes sorted.

[Stevec35]

Nice shot with plenty of detail Justin although the registration is a little off in the top right. In an case this sort of image just shows what's possible with a DSLR these days. Amazing to someone like me brought up in the film days.

Cheers

Steve

[tilbrook@rbe.ne]

Thanks Mike!

Yep, don't even need to drink heavily to see doubles with this one:D.



Thanks Dave!

Get them sorted one day.



Thanks Steve!

I'm pleasantly surprised how much detail that came out.

Cheers,

Justin.

[multiweb]

What was the scope Justin? Is it an 8" newtonian or an RC? I assume Newt because you mentioned MPCC? Just asking because I seem to get a wider FOV at the same FL.

[WingnutR32]

Nice photo Justin, what was the FL?

[tilbrook@rbe.ne]

Hi Marc,

8" f/4 newt, branded BINTEL, Orion I think.
The image is cropped slightly.



Thanks Sam!

800mm.

Cheers,

Justin.

[multiweb]

Ah... makes sense now. Thanks. :thumbsup: