Still Testing - DPChallenge Forums

04/11/2005 08:46:32 PM · #1

I own a Canon 90-300mm f4.5/5.6 USM lens and have been testing since i have bought it... i own it for like 3 months or more... and today i was testing night shots.
What do you think of it and is it sharp... am i going on the right way... my tripod is not my bet friend for this lens but is it going good. or any tips or tircks if it ain't right.

Thanks in advance

04/11/2005 08:49:34 PM · #2

I don't think that a night shot is great for telling the sharpness of a lens. I do however like that shot alot, good job with it! Try shooting a chart, or a brick wall to test the sharpness.

04/11/2005 08:51:34 PM · #3

Originally posted by kyebosh:

I don't think that a night shot is great for telling the sharpness of a lens. I do however like that shot alot, good job with it! Try shooting a chart, or a brick wall to test the sharpness.

Wait a second i'll post a day shot... that i have been testing hand held.
I have been having trouble getting them sharp... even at night since it get a little blurry.

04/11/2005 08:54:39 PM · #4

Here is a day shot testing.

04/11/2005 09:48:32 PM · #5

bump

04/11/2005 09:51:19 PM · #6

It's hard to judge a picture without knowing the shutter speed. Why don't you wait till tomorrow and post a shot at 1/1000 of a second or so. That will eliminate any possible shake you might have. That shot you posted does however look soft. But I cannot tell if it is the lens or just camera shake.

04/12/2005 09:53:47 AM · #7

bump

Canon EF 24-105mm f/4.0L IS

04/12/2005 04:38:06 PM · #8

is it too hard to ask for help or do i really need to beg... or is it really hard to give an ideia?
I might have here a problem with comunication no?
Please now tell me what should i do to have some little help?
Maybe i just don't need to ask for help maybe i have to learn how to ask for it...
i just don't understand it.. but ok. if you can help please do...

PollyBean

Canon EOS-5D

04/12/2005 04:47:50 PM · #9

The bird shot seems a little soft to me. Is it resized for web with some compensating sharpen? A 100% crop of a very intricate object in good light at 1/1000s (as kyebosh suggested) might help people to judge the sharpness of images gotten with your new lens.

P.S. I have lens envy!

SteveJ

Canon EOS-7D

Canon EF-S 18-135mm f/3.5-5.6 IS STM

04/12/2005 04:49:52 PM · #10

Don't know much about the lens you are using, but it appears sharp enough, with no signs of front or back focussing. Your bird shot, I assume was shot at 300mm and looks pretty sharp, did you use any PS post processing for this picture?

It would help if you could provide the lens setting, exposure and ISO used for it.

I have experienced problems with my 28-135 at the longest range, but found that most of it is down my lack of knowledge with this lens. What focussing point are you using?

Can't help a lot more without further info.

Steve

04/12/2005 05:20:06 PM · #11

Originally posted by PollyBean:

I'll have to take a shot with the 1/1000s it is a slight crop of the photo.

04/12/2005 05:21:07 PM · #12

Originally posted by Formerlee:

The iso is on the photo, it is ISO-400 the range is at 300mm with a slight crop on photoshop and i used usm once i guess.

04/12/2005 05:21:43 PM · #13

Thanks and sorry for the way i said things but this always happens to me... thanks for trying to share your knowledge.

04/12/2005 05:32:19 PM · #14

Be glad to comment when you post another test shot.

04/12/2005 05:45:08 PM · #15

Originally posted by kyebosh:

Be glad to comment when you post another test shot.

Thanks.

04/18/2005 12:22:36 PM · #16

Kyebosh here is the shot taken at 1/1600 Iso:400 F9.0
At 300mm i think it is still soft... what do you think?

04/18/2005 02:29:47 PM · #17

bump

04/18/2005 02:32:28 PM · #18

Yes i have to agree it still looks soft, this isn't a 100% crop correct?

04/18/2005 02:40:08 PM · #19

I plan on testing 3 of my lenses against each other soon, I was thinking of using a newspaper across the room, and the camera on a tripod with controlled lighting. I think that if you could so something like that we could compair results, I have only one lens that goes to 300mm and it isn't very good. However if it proves better than yours, i am looking to sell it very cheap. If you want to do 200mm I have an L lens in that range now that i suspect will beat my 100-300 even when wide open.

04/18/2005 02:49:20 PM · #20

nope that is right out of the camera i shot raw and used the canon software to convert to jpeg.
I am using the sharpness setting on the camera at the highest sharpness possible..
I am waiting to get my hands on a Canon 70-200mm F2.8L USM IS but i want to make sure this lens is good or not because i will be hanging to it a while.

Canon EF 70-200mm f/2.8L IS USM

04/18/2005 02:54:08 PM · #21

I just got the 80-200L if you want to see test shots from it, it's slightly sharper than the 70-200L, but without the IS and slightly slower focusing.

Also... your sharpness settings don't matter if you're shooting raw. All those settings, contrast, sharpness, color, those are only if you're shooting in jpeg mode.

Message edited by author 2005-04-18 14:55:43.

Plexxoid

Canon EOS-30D

04/18/2005 02:57:27 PM · #22

Post 100% crops of detailed textures. That's how to tell if it's sharp or not. Shoot at 300mm wide open, too.

04/18/2005 03:07:54 PM · #23

Originally posted by kyebosh:

I have seen those shots and it is a great piece of glass... i just want to get my hands on the canon 70-200mm.. but just want to get this straight first see if the lens is really bad or what...
How do i do a 100% crop? i know this is basic. i know how to crop but not a 100% crop. :(

04/18/2005 03:10:59 PM · #24

ok it's pretty easy, just take a detailed part of the picture when it's in full resolution and crop to that section only, you'll probably want that to be a 500 x 500 give or take a bunch crop. don't resize it! Save it like that. Basically you just want a piece of the photo so that we can see what a portion of the full verion looks like before resizing.

I gotta go to class i'll be back later tonight.

Message edited by author 2005-04-18 15:12:47.