Jupiter rising


Photo Information
Taken with a 600mm mirror lens (possibly with a 2* TC) for 35s (B setting)
Fixed tripod, works OK for the foreground but shows the beginnings of star trails.
This shot badly needed to be done at high ISO, but I've got a bad habit of leaving ISO on auto & finding its defaulted to 200...
20/10/2010 - 00:17petrochemist
CategoryGeneral
Shutter Speed35.5 sec
ApertureN/A
LensN/A
ISO200
Focal LengthN/A

GIULIO57

Link Posted 20/10/2010 - 10:40
Nice.Giulio 57
PPG

coker

Link Posted 20/10/2010 - 14:05
Hi, Mike

I think the ISO setting is the key; although there is more noise, the necessary degree of crop would incur more noise anyway, but reducing the tone of the image cuts a lot of it down. All would enable a shorter shutter speed to avoid star-trails.

Have another go!

Thanks for letting us see,

Coker.
The more I look, the more there is to see!

petrochemist

Link Posted 20/10/2010 - 17:53
coker wrote:
Hi, Mike

I think the ISO setting is the key; although there is more noise, the necessary degree of crop would incur more noise anyway, but reducing the tone of the image cuts a lot of it down. All would enable a shorter shutter speed to avoid star-trails.

Have another go!

Thanks for letting us see,

Coker.

Just before going to bed this morning (2am!) I took a few more of Jupiter (& the moon) which have come out better - all 4 moons show as tiny circles - but I couldn't get any surface detail on Jupiter

I used the 600 cat again with & without a 3* TC. Registax might be able to do something with them (I MUST get round to downloading it). I've heard refractors give better contrast than mirror lenses, so I plan to try again tonight (with my baby 3" scope & 300mm f4) as it looks like it may be clear with out waiting too late. It looks as if we can get away using considerably shorter exposures - 1/4s ISO 3200 just shows Jupiter's moons at what would have been F22 or worse (using the TC)

Mind you, it could be my focusing that's the problem, - nailing infinity spot on is more awkward than I thought - nudging the focusing ring 1/2 a mm either way is too much

Mike
Mike
.
Pentax:K5ii, K7, K100D, DA18-55, DA10-17, DA55-300, DA50-200, F100-300, F50, DA35 AL, 4* M50, 2* M135, Helicoid extension, Tak 300 f4 (& 6 film bodies)
3rd Party: Bigmos (Sigma 150-500mm OS HSM),2* 28mm, 100mm macro, 28-200 zoom, 35-80 zoom, 80-200 zoom, 80-210 zoom, 300mm M42, 600 mirror, 1000-4000 scope, 50mm M42, enlarger lenses, Sony & micro 4/3 cameras with various PK mounts, Zenit E...
Far to many tele-converters, adapters, project parts & extension tubes etc.

.[size=11:].Flickr WPF Panoramio

coker

Link Posted 20/10/2010 - 18:41
Go for it, Mike!!!

....But don't stay up too late; school tomorrow!

With you all the way,

Roger.
The more I look, the more there is to see!

coker

Link Posted 20/10/2010 - 19:34
Mike,

Just poked my 600mm. f8 Sigma out of the window at jupiter...

v.difficult (impossible?) to focus on infinity, & that's without a 2x converter!

I think the way forward is to use a lens with a reasonably "bright" aperture, & crop.

Considering the distances involved, is a few mm.s in focal length doing much?

Let us know how you're getting on.

Roger.
The more I look, the more there is to see!

petrochemist

Link Posted 20/10/2010 - 23:15
coker wrote:
Mike,

Just poked my 600mm. f8 Sigma out of the window at jupiter...

v.difficult (impossible?) to focus on infinity, & that's without a 2x converter!

I think the way forward is to use a lens with a reasonably "bright" aperture, & crop.

Considering the distances involved, is a few mm.s in focal length doing much?

Let us know how you're getting on.

Roger.

Roger

If you use a shorter lens and crop the focusing of the lens becomes more critical, so that's no real gain. After your eyes have acclimatized to the dark (best to be at least 30 minutes) seeing Jupiter is easy enough even with my scope zoomed to 4000mm which is apparently F64.

You may find focusing on the moon Which is effectively much the same distance might help (if it doesn't dazzle you too much!)

Having got the kids to bed, I've been able to play for the last couple of hours with my Newtonian - most of it trying alternative adapters to try & find a setup where the point of focus is within the range of movement (failed!) I did get some excellent views of the moon but only without the camera

My wife's not back from her evening out yet so I'll go play with camera lenses again.

I have to admit I'm nearing the point of giving up the distant stuff & going back to playing with macro.
Mike
Mike
.
Pentax:K5ii, K7, K100D, DA18-55, DA10-17, DA55-300, DA50-200, F100-300, F50, DA35 AL, 4* M50, 2* M135, Helicoid extension, Tak 300 f4 (& 6 film bodies)
3rd Party: Bigmos (Sigma 150-500mm OS HSM),2* 28mm, 100mm macro, 28-200 zoom, 35-80 zoom, 80-200 zoom, 80-210 zoom, 300mm M42, 600 mirror, 1000-4000 scope, 50mm M42, enlarger lenses, Sony & micro 4/3 cameras with various PK mounts, Zenit E...
Far to many tele-converters, adapters, project parts & extension tubes etc.

.[size=11:].Flickr WPF Panoramio
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