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Fretless Pete
Joined: 12 Oct 2009
Posts: 171
Location: UK
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 Posted: Sun Apr 03, 2011 3:03 pm Post subject: 600mm f5 howitzer |
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Fretless Pete wrote:
Blue Tit on feeder , 600mm f5 astro scope
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martyn_bannister
Joined: 23 May 2010
Posts: 1151
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| Posted: Sun Apr 03, 2011 3:09 pm Post subject: |
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martyn_bannister wrote:
Excellent - lets see the lens  |
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LucisPictor
Joined: 26 Feb 2007
Posts: 17633
Location: Oberhessen, Germany / Maidstone ('95-'96)
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| Posted: Sun Apr 03, 2011 3:10 pm Post subject: |
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LucisPictor wrote:
| martyn_bannister wrote: |
| Excellent - lets see the lens |
+1
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Fretless Pete
Joined: 12 Oct 2009
Posts: 171
Location: UK
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| Posted: Sun Apr 03, 2011 3:16 pm Post subject: |
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Fretless Pete wrote:
Certainly gentleman - here she is
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gaeger
Joined: 16 Jan 2010
Posts: 722
Location: Brier, Wash.
Expire: 2021-03-09
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| Posted: Sun Apr 03, 2011 3:19 pm Post subject: |
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gaeger wrote:
Bird and lens -- awesome!
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Fretless Pete
Joined: 12 Oct 2009
Posts: 171
Location: UK
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| Posted: Sun Apr 03, 2011 3:25 pm Post subject: |
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Fretless Pete wrote:
Thanks G
Looks a little different now, as i've toned down the obvious bits, just for the birds 
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martyn_bannister
Joined: 23 May 2010
Posts: 1151
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| Posted: Sun Apr 03, 2011 5:45 pm Post subject: |
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martyn_bannister wrote:
It really is an "astro" scope! How did you get it to focus so closely? |
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Lloydy
Joined: 02 Sep 2009
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Location: Ironbridge. UK.
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| Posted: Sun Apr 03, 2011 8:30 pm Post subject: |
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Lloydy wrote:
Very impressive.
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Toeteraar
Joined: 23 Jan 2009
Posts: 163
Location: Dronten Netherlands
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| Posted: Sun Apr 03, 2011 9:11 pm Post subject: |
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Toeteraar wrote:
Wonderful howitzer and magnificent result.
Is this perhaps an older model ? i could not find a 600mm on Sky Watchers website.
And the main question of any Dutch photographer: Is it as expensive as an apochromatic telephotolens ?
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Fretless Pete
Joined: 12 Oct 2009
Posts: 171
Location: UK
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| Posted: Sun Apr 03, 2011 9:24 pm Post subject: |
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Fretless Pete wrote:
| martyn_bannister wrote: |
| It really is an "astro" scope! How did you get it to focus so closely? |
You add more extension tubes I've had this down to around 15ft, but the more tubes you add, you lose more and more distance focus.
There's an optimun length for ext. tubes, and its around 50-80mm
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Fretless Pete
Joined: 12 Oct 2009
Posts: 171
Location: UK
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| Posted: Sun Apr 03, 2011 9:30 pm Post subject: |
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Fretless Pete wrote:
| Toeteraar wrote: |
Wonderful howitzer and magnificent result.
Is this perhaps an older model ? i could not find a 600mm on Sky Watchers website.
And the main question of any Dutch photographer: Is it as expensive as an apochromatic telephotolens ? |
It may well be an older model, but its still for sale. Its the Skywatcher ST ( star travel )120
http://www.rothervalleyoptics.co.uk/startravel-120-az3-telescope_d34.html
No its not anywhere near as expensive as an APO. The APO/ED version of this scope is around £1000 in the UK, as opposed to £236 for my scope
The downside of non APO is, of course as you know, the CA is uncorrected. There are no ED / Flourite glass in this lens, so you either have to be careful about your compositions, or you deal with it in software. I use ACR 5 and Adobe CS4
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Fretless Pete
Joined: 12 Oct 2009
Posts: 171
Location: UK
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| Posted: Sun Apr 03, 2011 9:34 pm Post subject: |
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Fretless Pete wrote:
Another capture, this time at about 90ft. Blue Tit was 25ft
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cooltouch
Joined: 15 Jan 2009
Posts: 9096
Location: Houston, Texas
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| Posted: Sun Apr 03, 2011 11:02 pm Post subject: |
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cooltouch wrote:
Really great shots, Pete.
Here's the thing about APO refractors, though -- even though the APO one sells for like 1,000 pounds like the way Pete said, that's the equivalent to a 600mm f/5 ED lens without the iris. A 120mm front objective. So, how much would you have to pay for the equivalent Nikkor or Canon? Well, there's a manual focus 600mm f/5.6 ED Nikkor on eBay right now with a BIN of $2700, a little over $1000 more than a new APO refractor scope.
The way I see it, a refractor scope is sort of limited in its capabilities, but if you're into astronomy and astrophotography, you may as well get a scope that can perform double duty, so that when the situation arises, you've got it in your inventory.
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Fretless Pete
Joined: 12 Oct 2009
Posts: 171
Location: UK
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| Posted: Mon Apr 04, 2011 1:07 am Post subject: |
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Fretless Pete wrote:
Thanks Michael
This is not that far away from the SW 80ED i used to own, which was posted on here some time back now
Its good bang for buck, as long as one doesnt mind manual everything - which shouldnt be a problem for people on these forums , obviously 
The other thing is the fixed aperture. But there's ways round this. If you fancy a little more DOF, then I just put a cap over the end of the dew shield. This effectively stops the scope down due to the restriction in light, and physically restricting the ' aperture ' of the scope, which is 120mm.
You could work out the aperture i suppose, if it was critical, but i cannot be bothered. I just stick the cap on, when needed, and shoot
Its a bit more hit and miss than having a proper aperture dial, but there's always a catch with cheap.
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