#1  
Old 09-12-2008, 09:23 AM
dugnsuz's Avatar
dugnsuz (Doug)
to baldly go...

dugnsuz is offline
 
Join Date: Aug 2005
Location: Hahndorf, South Australia
Posts: 4,201
200mm v's 280mm - 1.4x Extender comparison

Hello all,
Received my Canon EF 1.4x extender from leon yesterday in as new condition (kudos leon).
I had one then sold it, then instantly regretted it - you know the score!!

I've attached a quick couple of moon snaps for comparison for anyone consideering a similar purchase to show the extended reach with the extender on a 200mm lens.
1st pic: 200mm, 2nd: 280mm
Cheers
Doug
Attached Thumbnails
Click for full-size image (200mm.JPG)
187.3 KB104 views
Click for full-size image (280mm.JPG)
172.5 KB108 views
Reply With Quote
  #2  
Old 09-12-2008, 09:37 AM
robgreaves
Registered User

robgreaves is offline
 
Join Date: Apr 2007
Location: Penrith NSW
Posts: 159
Nice comparison... Nice shot too, actually! The Canon 2x Extender is also a decent bit of kit, and makes a much greater (well, 2x!) focal length difference.

On something like the 300mm L series it's superb. There are a couple of lenses that it won't AF on due to the 2 stops of light loss. I think there is only 1 stop of loss on the 1.4x.

Regards,
Rob
Reply With Quote
  #3  
Old 09-12-2008, 10:56 AM
RB's Avatar
RB (Andrew)
Moderator

RB is offline
 
Join Date: Aug 2005
Posts: 23,244
Nice one Dougie.
Reply With Quote
  #4  
Old 09-12-2008, 12:15 PM
Dennis
Dazzled by the Cosmos.

Dennis is offline
 
Join Date: May 2005
Location: Brisbane
Posts: 11,171
Sorry Doug, this is an invalid test.

You did not control all the variables the clouds moved between frames!

I ran a similar test on the Canon 40mm F5.6 with the x1.4 and the x2 converters and when tripod mounted and using a remote release, both converters gave stunning results.

Cheers

Dennis
Reply With Quote
  #5  
Old 09-12-2008, 12:46 PM
dugnsuz's Avatar
dugnsuz (Doug)
to baldly go...

dugnsuz is offline
 
Join Date: Aug 2005
Location: Hahndorf, South Australia
Posts: 4,201
Quote:
Originally Posted by robgreaves View Post
Nice comparison... Nice shot too, actually! The Canon 2x Extender is also a decent bit of kit, and makes a much greater (well, 2x!) focal length difference.

On something like the 300mm L series it's superb. There are a couple of lenses that it won't AF on due to the 2 stops of light loss. I think there is only 1 stop of loss on the 1.4x.

Regards,
Rob
A 2x on my 70-200mm f4L would turn it into a f8, but on a f2.8 lens - very nice

Quote:
Originally Posted by RB View Post
Nice one Dougie.
I like the tone of your response young man!!

Quote:
Originally Posted by Dennis View Post
Sorry Doug, this is an invalid test.

You did not control all the variables the clouds moved between frames!

I ran a similar test on the Canon 40mm F5.6 with the x1.4 and the x2 converters and when tripod mounted and using a remote release, both converters gave stunning results.

Cheers

Dennis
Bah, Humbug!!!
Is that the 400mm 5.6L? How do you find that for astro work?


Cheers all
Reply With Quote
  #6  
Old 09-12-2008, 01:04 PM
leon's Avatar
leon
Registered User

leon is offline
 
Join Date: Apr 2006
Location: ballarat
Posts: 11,340
Doug I want it back immediately. nice shooting.

Leon
Reply With Quote
  #7  
Old 09-12-2008, 01:15 PM
dugnsuz's Avatar
dugnsuz (Doug)
to baldly go...

dugnsuz is offline
 
Join Date: Aug 2005
Location: Hahndorf, South Australia
Posts: 4,201
Quote:
Originally Posted by leon View Post
Doug I want it back immediately. nice shooting.

Leon
Cheers and No!!!!
Doug

Reply With Quote
  #8  
Old 09-12-2008, 02:14 PM
TrevorW
Registered User

TrevorW is online now
 
Join Date: Aug 2006
Location: Western Australia
Posts: 7,342
How would a 2x go on a 300mm zoom Sigma lens I have for the Pentax

Cheers
Reply With Quote
  #9  
Old 09-12-2008, 02:14 PM
Dennis
Dazzled by the Cosmos.

Dennis is offline
 
Join Date: May 2005
Location: Brisbane
Posts: 11,171
Quote:
Originally Posted by dugnsuz View Post
Is that the 400mm 5.6L? How do you find that for astro work?
Cheers all
Hi Doug

Ive just found the old post and my apologies, it was only a test of the x2 (not x1.4 as well) with the 400mm F5.6L, versus up-sampling x2 in CS3.

Here is the link to the test image.

Here is the link to another star field test of the 400mm. It is a superb lens.

Cheers

Dennis
Reply With Quote
  #10  
Old 09-12-2008, 06:39 PM
RB's Avatar
RB (Andrew)
Moderator

RB is offline
 
Join Date: Aug 2005
Posts: 23,244
Quote:
Originally Posted by RB
Nice one Dougie.
Quote:
Originally Posted by dugnsuz View Post
I like the tone of your response young man!!
Just trying to confuse you with my colourful response.
Reply With Quote
  #11  
Old 09-12-2008, 08:47 PM
dugnsuz's Avatar
dugnsuz (Doug)
to baldly go...

dugnsuz is offline
 
Join Date: Aug 2005
Location: Hahndorf, South Australia
Posts: 4,201
Quote:
Originally Posted by RB View Post
Just trying to confuse you with my colourful response.
I'll admit to being disorientated for a wee bit

Last edited by dugnsuz; 10-12-2008 at 11:19 AM.
Reply With Quote
  #12  
Old 09-12-2008, 08:54 PM
dugnsuz's Avatar
dugnsuz (Doug)
to baldly go...

dugnsuz is offline
 
Join Date: Aug 2005
Location: Hahndorf, South Australia
Posts: 4,201
Quote:
Originally Posted by TrevorW View Post
How would a 2x go on a 300mm zoom Sigma lens I have for the Pentax

Cheers
From what I've read Trevor, the 2x is a gamble on anything but the high end Canon lenses (300mm f2.8L for example) - sweet spot is the 1.4x extender.
But (there's always a "but" in astro-imaging), Photozone reviews states that IQ is degraded significantly in the 100-300mm f4 Sigma Zoom and 1.4x Extender combo - shame, as the 100-300mm Sigma zoom gets a 9.5/10 sans extender.
http://www.photozone.de/canon-eos/32...report--review

Last edited by dugnsuz; 10-12-2008 at 11:20 AM.
Reply With Quote
  #13  
Old 12-12-2008, 06:25 PM
AlexN's Avatar
AlexN
Tunnel Vision

AlexN is offline
 
Join Date: Mar 2008
Location: Brisbane, Australia
Posts: 6,708
My Tokina 300mm F/2.8 with Kenko 2x converter worked, 600mm F/5.6 with AF working etc, although, AF was inconsistent, rather inaccurate at times, and the image quality suffered. aberrations started appearing with the converter etc...

The 70-200 L lens with the Canon 1.4x converter (that I bought off Doug, whom instantly regretted it, and bought another ) produces outstanding results.. image quality seems spot on, sharpness, AF reliability is still top notch...

Its a winning combination thats for sure.

Alex.
Reply With Quote
Reply

Bookmarks

Thread Tools
Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +10. The time is now 11:41 AM.

Powered by vBulletin Version 3.8.7 | Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
Advertisement
Bintel
Advertisement
NexDome Observatories
Advertisement
Limpet Controller
Advertisement
Testar
Advertisement
Astronomy and Electronics Centre
Advertisement