Pixalo Photography Community

Go Back   Pixalo Photography Community > Photography Forums > Cameras, Lenses and Accessories

Cameras, Lenses and Accessories: Discuss General lens qusetion...Hi.. Only a memeber for 12 hours, already got lots of info from the site! I`m new to photography and ...
Welcome to the Pixalo Photography Community. As a Guest you are free to browse the site, but see what extras you get as a Member here.


Reply
 
LinkBack Thread Tools Display Modes
Old 30-07-2006, 14:28   #1 (permalink)
Quite Chatty
 
Join Date: Jul 2006
Location: Huddersfield
Posts: 81
andy5452 will become famous soon enoughandy5452 will become famous soon enoughandy5452 will become famous soon enoughandy5452 will become famous soon enough

Image editing O.K.
User's Gallery
General lens qusetion

Hi.. Only a memeber for 12 hours, already got lots of info from the site!

I`m new to photography and a little confused. I have an S2 pro with a 28 - 70 Sigma zoom and a fixed 100mm Sigma Macro. (bought as a job lot from a friend). What confuses me is the way lens are rated on websites 70-200 f4.5-5.6 for example. I don`t know what it means! I`ve asked in Jessops etc. and told this would be a slow lens and would be better with a quicker lens (a lot more money) what do you get for your money?? The two lense I have go from f2.8 - f32. Are they "quick lenses?"

I`m basically looking for a decent zoom lense suitable for a intermediate hobby photographer ... Can any one offer any guidence??

Andy

Last edited by andy5452; 30-07-2006 at 14:34.
andy5452 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Old 30-07-2006, 15:18   #2 (permalink)
Loves the place
 
silkstone's Avatar
 
Join Date: Jan 2005
Location: Silkstone Common, Yorkshire, UK
Posts: 5,719
silkstone is a glorious beacon of lightsilkstone is a glorious beacon of light
silkstone is a glorious beacon of lightsilkstone is a glorious beacon of lightsilkstone is a glorious beacon of lightsilkstone is a glorious beacon of lightsilkstone is a glorious beacon of lightsilkstone is a glorious beacon of lightsilkstone is a glorious beacon of lightsilkstone is a glorious beacon of lightsilkstone is a glorious beacon of lightsilkstone is a glorious beacon of lightsilkstone is a glorious beacon of light

Image editing O.K.
User's Gallery
Users Camera Equipment List
Re: General lens qusetion

Let's take the example you mentioned... 70-200 f4.5-5.6

70mm is the minimum focal length, and 200mm is the maximum. This is the 'zoom range'.

f/4.5 is the maximum aperture at 70mm focal length. f/5.6 is the maximum aperture at 200mm.

The f-number is actually the ratio of aperture diameter to focal length (hence to be strictly correct it is written with a / ). So... at 70mm and f/4.5 the actual diameter of the iris is 70/4.5 = 15.6mm. At 200mm and f/5.6 the iris diameter is 200/5.6 = 35.7mm.

That's why long lenses with large maximum apertures are large and expensive - for example, a 300mm f/2.8 lens would have a maximum iris diameter of 300/2.8 = 107mm.

'Fast' lenses are those with large maximum apertures (small f-numbers) - but that's all relative to focal length. The Canon 50mm f/1.8 is pretty fast (although there's also an f/1.4 version which costs a lot more), but as you go to longer focal lengths it isn't practicable to have huge apertures. A maximum of f/2.8 is fast for zooms and most prime lenses.

Remember that this figure is only the maximum, and that most lenses give better results at one or two stops down from wide open. Also the depth of field - the range of distances that appear to be in focus - varies with aperture and focal length. Large apertures and long lenses give a very small DOF, which is fine if you want the background to be blurred but not so good if you'd like everything to be in focus.

HTH.
__________________
I answer to "Silky", "Paul" and "miaow".
silkstone is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Old 30-07-2006, 15:25   #3 (permalink)
Quite Chatty
 
Join Date: Jul 2006
Location: Huddersfield
Posts: 81
andy5452 will become famous soon enoughandy5452 will become famous soon enoughandy5452 will become famous soon enoughandy5452 will become famous soon enough

Image editing O.K.
User's Gallery
Re: General lens qusetion

Thanks, So as a newboy to all this I was considering buting a "Nikon AF Nikkor 70-300mm f/4-5.6 G Lens" as an introduction into the world of Zooms (80) (If I undestand you correctly) That being max app at 70mm of F4 and a max app at 300mm 5.6?? That now seems a very restrictive amount of control over the depth of field, but quite a large amount of zoom?

Andy
andy5452 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Old 30-07-2006, 15:30   #4 (permalink)
Loves the place
 
silkstone's Avatar
 
Join Date: Jan 2005
Location: Silkstone Common, Yorkshire, UK
Posts: 5,719
silkstone is a glorious beacon of lightsilkstone is a glorious beacon of light
silkstone is a glorious beacon of lightsilkstone is a glorious beacon of lightsilkstone is a glorious beacon of lightsilkstone is a glorious beacon of lightsilkstone is a glorious beacon of lightsilkstone is a glorious beacon of lightsilkstone is a glorious beacon of lightsilkstone is a glorious beacon of lightsilkstone is a glorious beacon of lightsilkstone is a glorious beacon of lightsilkstone is a glorious beacon of light

Image editing O.K.
User's Gallery
Users Camera Equipment List
Re: General lens qusetion

The f/4-5.6 is just the *maximum* aperture at the extremes of focal length. The lens will probably stop down to f/22 (???) throughout the zoom range, which will give a much greater depth of field.

Usually these lenses perform best at around f/8 or f/11.
silkstone is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Old 30-07-2006, 15:37   #5 (permalink)
Feet under the table
 
Join Date: Mar 2006
Location: Edinburgh
Posts: 1,928
orangepeel is a glorious beacon of lightorangepeel is a glorious beacon of lightorangepeel is a glorious beacon of light
orangepeel is a glorious beacon of lightorangepeel is a glorious beacon of lightorangepeel is a glorious beacon of lightorangepeel is a glorious beacon of light

Image editing O.K.
User's Gallery
Users Camera Equipment List
Re: General lens qusetion

Nikon AF Nikkor 70-300mm f/4-5.6 G Lens: -
f/4-32 @ 70mm
f/5.6-45 @ 300mm
orangepeel is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Old 30-07-2006, 15:43   #6 (permalink)
Quite Chatty
 
Join Date: Jul 2006
Location: Huddersfield
Posts: 81
andy5452 will become famous soon enoughandy5452 will become famous soon enoughandy5452 will become famous soon enoughandy5452 will become famous soon enough

Image editing O.K.
User's Gallery
Re: General lens qusetion

Brilliant. Thanks.

Next question then (if I may) I here a lot about "no fungus" when looking at various used lenses. Fungus, well I know what that is. Can I assume if a lens has fungus on it, then it`s uselss??

Andy
andy5452 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Old 30-07-2006, 15:57   #7 (permalink)
Pixalo Crew
 
Dave's Avatar
 
Join Date: Jul 2005
Posts: 18,309
Dave is just really nice
Dave is just really niceDave is just really niceDave is just really niceDave is just really niceDave is just really niceDave is just really niceDave is just really niceDave is just really nice

Image editing O.K.
User's Gallery
Users Camera Equipment List
Re: General lens qusetion

Hi Andy

In vast majority of questions I would walk away from such a lens. Plenty more fish in the sea as they say . I have heard of people being offered a lens for a song in such a condition & having a go at repairing themselves......not for the faint hearted I would expect

Have you been offered a lens in such a state ?

BTW glad you are finding the masses of info on this site of use All down to the excellent member base
Dave is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Old 30-07-2006, 16:08   #8 (permalink)
Quite Chatty
 
Join Date: Jul 2006
Location: Huddersfield
Posts: 81
andy5452 will become famous soon enoughandy5452 will become famous soon enoughandy5452 will become famous soon enoughandy5452 will become famous soon enough

Image editing O.K.
User's Gallery
Re: General lens qusetion

Yes such a lens is on offer, though the fungus is on the inner lens and appears not to be noticible on the final image.

Andy
andy5452 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Old 30-07-2006, 16:27   #9 (permalink)
Loves the place
 
silkstone's Avatar
 
Join Date: Jan 2005
Location: Silkstone Common, Yorkshire, UK
Posts: 5,719
silkstone is a glorious beacon of lightsilkstone is a glorious beacon of light
silkstone is a glorious beacon of lightsilkstone is a glorious beacon of lightsilkstone is a glorious beacon of lightsilkstone is a glorious beacon of lightsilkstone is a glorious beacon of lightsilkstone is a glorious beacon of lightsilkstone is a glorious beacon of lightsilkstone is a glorious beacon of lightsilkstone is a glorious beacon of lightsilkstone is a glorious beacon of lightsilkstone is a glorious beacon of light

Image editing O.K.
User's Gallery
Users Camera Equipment List
Re: General lens qusetion

I wouldn't touch it TBH. Anything like that will affect the final image, and fungus indicates that the lens has been stored in damp conditions.
silkstone is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Old 30-07-2006, 18:39   #10 (permalink)
Quite Chatty
 
Join Date: Jul 2006
Location: Huddersfield
Posts: 81
andy5452 will become famous soon enoughandy5452 will become famous soon enoughandy5452 will become famous soon enoughandy5452 will become famous soon enough

Image editing O.K.
User's Gallery
Re: General lens qusetion

Ok then. Thanks for everybodies help on this one.
Andy
andy5452 is offline  
Digg this Post!Add Post to del.icio.usBookmark Post in TechnoratiFurl this Post!
Reply With Quote
Reply

Thread Tools
Display Modes

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
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
General Guidelines for Comments Pixalo Site Guides and Rules 0 08-03-2007 09:12


All times are GMT +1. The time now is 05:19.


vBulletin Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
ReviewPost & PhotoPost vB3 Enhanced, Copyright 2003-2014 All Enthusiast, Inc.
SEO by vBSEO 3.3.0
Copyright 2006 - 2017 Pixalo.com

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197