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View Full Version : The definitive Zoom example thread..

DoubleT
13-02-2007, 14:11
Ok guys.. i popped in to my local Jessops today whilst in town and in a display cabinet they had a sigma 300mm-800mm lens. its quite a beast.

now! i was chatting with my wife last night and we are talking about going to Africa sometime on a Safari holiday. i pre-warned her that i may need to get another lens..

now seeing that 300-800mm got me a little excited but the lens will cost nearly as much as the holiday. so im thinking thats out of the question.

ive had a quick look at sigmas range of 50-500mm and they seem fairly good.

also. would like to know how good the 2x converters are.

is it really capable of taking my 300mm lens and turning it into 600mm without changing quality????

so, i want to start this thread.

heres the question..

Can you please post up what you have.

take a little time out and get your shortest focal length lens. take a photo then take your longest focal length lens and take the same shot as before.

if you do have any extension/converters etc that lengthen the focal lenth can you show me before and afters of them please too.

so come on guys, help me out here ;)

heres my first one to get us all started ..

18mm my shortest ( ive marked the focus piont to show ease for the next photo)
http://img.photobucket.com/albums/v488/DoubleT/18mm.jpg

300mm

http://img.photobucket.com/albums/v488/DoubleT/300mm.jpg

so.. any advances on 300mm???

thanks guys

:wave:
Jason
13-02-2007, 14:31
This is something i would be interested in seeing.

Great thread.
chuckles
13-02-2007, 14:37
is it really capable of taking my 300mm lens and turning it into 600mm without changing quality????



Can't help with ay actual examples cos I'm 110 miles from home.... :(

One thing i will say about ANY t/conv ..... any aberrations you have of any of your lenses will be magnified (made worse) by the factor of your teleconverter.... in other words - you need a damn fine lens to start with and the 70-300mm G series Nikkor [sadly] doesn't fit into that category....
whitewash
13-02-2007, 14:42
you can use the 2x and 1.4x TC's on the 50-500 lens but you loose autofocus, the quality will also suffer quite a bit with the 2x, but aparently loss of quality with the 1.4x is far less. the sigma site also states that when fitted to the 50-500 the zoom range will be limited to between 100-500 so i presume effectively making the lens between 140-700 (1.4x) or 200-1000mm(2x)


depends on what you want from the lens i guess but id have thought for safari wild animal pictures you'd want to retain AF


the WE converter chart also doesnt list your 70-300mm lens on the chart which suggests its not compatable, id presume the rearmost element of the lens would protrude into the TC which is a no no
DoubleT
13-02-2007, 14:50
oooo some good advice there. thanks guys, would be interested to see it in action though.
whitewash
13-02-2007, 15:14
same zoom range but a different subject

18mm (on a 20D thus 28.8mm effective)
http://www.whitewashimages.co.uk/junk/18mm.jpg

300mm (480mm effective)
http://www.whitewashimages.co.uk/junk/300mm.jpg
Steep
13-02-2007, 15:27
Remember when you are talking about the difference between a 1.6crop (20d) and a 35mm full sensor it's only the field of view that's different. The magnification stays the same, you just get less acreage with the smaller sensor.
whitewash
13-02-2007, 15:31
but without stating that a crop has taken place due to the sensor we'd get vsatly differing results when comparing images taken with full frame, 1.3x 1.6x and 4/3rds cameras
chuckles
13-02-2007, 15:42
Tsk! don't forget 1.5x over on the Darkside! ;)
whitewash
13-02-2007, 15:45
its easy to forget something so insignificant:nuts: :lol:
chuckles
13-02-2007, 15:50
Insignifcant? Just think how easy the sums are! :lol: 1.6 x <Anything> is S_O complicated :naughty:
Witch
13-02-2007, 17:45
yeah, but Canon-ites are smarter so that's not a problem....! :lol:
Joe T
13-02-2007, 18:35
http://www.usa.canon.com/html/eflenses/lens101/focallength/index.html This should give you what you need. :)
oldgit
13-02-2007, 19:26
How about:

This
http://www.talkphotography.co.uk/gallery/data/826/7.jpg

from
http://www.talkphotography.co.uk/gallery/data/826/7_Stift.jpg

[edit] and now looking at it its a KAK example as it was done for a competition intended to obfusticate the answer[edit]

Thats a the sigma 105 macro ...

:thinking: maybe this isn't quite what you had in mind :thinking: :p
oldgit
13-02-2007, 19:36
http://www.usa.canon.com/html/eflenses/lens101/focallength/index.html This should give you what you need. :)

Joe... Damn good find dude
DoubleT
14-02-2007, 06:30
yeah, good find joe :thumbs:
Woodsy
14-02-2007, 19:54
Seems rather pointless me doing this, but i started before seeing Joe Ts post.

18mm
http://i22.photobucket.com/albums/b315/Woodsy2k/DSC_6709.jpg

500mm
http://i22.photobucket.com/albums/b315/Woodsy2k/DSC_6711.jpg

Hope that helps :)

P.S. equipment used is in Sig
busterboy
14-02-2007, 19:59
http://www.usa.canon.com/html/eflenses/lens101/focallength/index.html This should give you what you need. :)



Top stuff Joe, Not seen that before..:thumbs:
Wyvern971
16-02-2007, 08:18
Also have a look at:

http://www.the-digital-picture.com/Reviews/ISO-12233-Sample-Crops.aspx

Also allows toy to compare lenses by using mouse over