Playing Around (astronomy nighttime ). Photo by WurzelDave
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Playing Around

Uploaded by: WurzelDave

Monday December 17, 2012

Bridgwater, Somerset, United Kingdom

Caption: The last in this series, here we have (among other things) the Orion nebula taken at max optical zoom (336mm) & 6 sec exposure.

Manufacturer: Canon

Model: Canon PowerShot SX150 IS

x-Resolution: 72.00

y-Resolution: 72.00

Resolution Unit: Inch

Software: Picasa

Artist: Picasa

YCbCr Positioning: centered

Compression: JPEG compression

Exposure Time: 6 sec.

FNumber: f/5.6

ISO Speed Ratings: 800

Exif Version: Unknown Exif Version

Components Configuration: Y Cb Cr -

Shutter speed: -2.59 EV (APEX: 0, 6 sec.)

Aperture: 4.97 EV (f/5.6)

Exposure Bias: 0.00 EV

Flash: Flash did not fire, compulsory flash mode.

Focal Length: 60.0 mm

User Comment:

FlashPixVersion: FlashPix Version 1.0

Color Space: sRGB

PixelXDimension: 600

PixelYDimension: 800

Focal Plane x-Resolution: 17802.20

Focal Plane y-Resolution: 17777.78

Focal Plane Resolution Unit: Inch

File Source: DSC

Custom Rendered: Custom process

Exposure Mode: Manual exposure

White Balance: Manual white balance

Digital Zoom Ratio: 1.00

Scene Capture Type: Standard

Image Unique ID: e2d1af39b284a31f1496c31137c3a569

InteroperabilityIndex: R98

InteroperabilityVersion: 0100

RelatedImageWidth: 3240

RelatedImageLength: 4320

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Display: 50, 100, 200 Sort: Newest First - Order Posted
4. WurzelDave
1:32 AM GMT on December 19, 2012
I see where you are coming from, this pic has been resized rather than cropped. 800ISO was used as a compromise to keep the exposure shorter, f5.6 the widest this would go at max optical zoom.
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3. Clabo
11:59 PM GMT on December 18, 2012
Hmm, dunno how much "better" that might be.

If this is wide-open already (@f/5.6) and takes 6sec, at 1200mm you'd need a good 30sec shot at the same ISO (no??), and 800 is probably on the edge of graininess already.¹

Without a clock-drive mount like for an actual telescope (vs plain ol' tripod), the stars would look less like '.'s and more like '-'s.

¹ I limit my ISO to 400 max, even for my flying critters, unless there's some *real* pressing need for anything higher. I usually shoot for clean *fullsize* pix, and at even at 400 a solid-color background (eg, a blue sky) can look a bit "pebbled" when viewed at 100%.

Sure, crop the pic for posting here at 800px across, and you can shoot, as Ken Rockwell puts it, at "stupid-high ISOs" ☺ and it'll look fine, but I'm kind of anal-retentive about that kind of thing.
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2. WurzelDave
12:41 PM GMT on December 18, 2012
Just think how much closer you could get with the Canon Powershot SX50 at max zoom optical (1200mm), you could probably get away with a 3 or 4 sec exposure @ 800ISO!
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1. Clabo
11:30 AM GMT on December 18, 2012
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About WurzelDave


I'm a 'wurzel' who lives in South West England (UK) in the county of Somerset (next to Devon), famous for scrumpy cider, Cheddar cheese, The Wurzels (well worth going to see) & birth county of 2009 F1 world champion Jenson Button.Like the rest of the West Country, Somerset has many areas, places & landscapes worth a visit such as Glastonbury Tor & Abbey ruins, Quantock hills, West Somerset Railway, Cheddar Gorge, & Exmoor, to name but a very few.Favourite holiday destiations are Iceland (see alot of photos) & the Icehotel in Jukkasjarvi Sweden (also see photos). Still a lover of the flim camera, my first camera was an Halina 110 camera which you could buy flip flashes for! I have a Canon 3000V SLR film camera, also have some TLR cameras from the 1950's plus Canon powershot A3300, SX150 & SX40 digital cameras which are useful for close up macro shots & also makes film 'last' longer! I also have a variety of film cameras (35mm, stereo, 110, 120 format) dating from 1940 upwards. Photos from these cameras will appear here from time to time

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