PDA

View Full Version : bad results with tamron & sigma



acoustech
02-28-2005, 07:15 PM
I'm far from a professional but have spent a couple of years shooting on my elan 7 with a tamron 28-200 af aspherical xr and had good results.
I've tried it numerous times with my digital rebel but the focus is generally
soft compared the lense that came with the digital rebel ( 18-55mm). I just tried shooting outside with a considerably faster shutter speed and higher iso to see if it was camera shake while zooming in more etc but the results are not as good as the inexpensive lense that came with the kit. I also tried my brothers sigma fixed lense I believe it's a 2.8 aperture lense (maybe its a 28mm lense it cost around 200$) anyway I got over exposed photos with that lense while shooting in auto (green mode-which I thought would at least meter fairly correctly) on the beach. Am I missing
something obvious here as in I'm clueless about digital slr's etc? or is it these fairly inexpensive 3rd party lenses aren't the way to go? I've been
looking for something to upgrade to as a better quality all purpose lense to replace the tamron and to be able to be a bit more creative than the 18-55mm that came with the dig rebel.
canon makes another digital lense, efs 18-85 with IS for $600. but I would like to have backward compatibility with the elan if possible and I think the IS makes up a good portion of the price of that lense.

Please any help from you pro's/semi pro's would be very helpful.

speaklightly
02-28-2005, 07:41 PM
I too have been disappointed recently with Sigma lenses, especially the 18-125mm. So I returned it and took the re-stocking charge.

I have not tried Tamron lenses.

Sarah Joyce

jeisner
02-28-2005, 11:58 PM
Its not the brand its the range, you have given two of the longest focal range lenses as you examples...

The Sigma 50mm DG EX Macro is brilliant quality, but it is not trying to cover 7x or 10x focal range at a budget price and in a small package. Those lenses are not meant to be high quality lenses, they are convieniance lenses, and cheap ones at that, and they serve their purpose well.

jamison55
03-01-2005, 07:19 AM
A couple of things to consider:

On your Elan 7, you probably never looked at images as closely as you look at the images created by your DReb - i.e. print a few of the images from the DReb at 4x6 and compare them to prints from the Elan.

As for your brother's lens, is is possible that you forgot to lower the ISO, and the camera couldn't compensate with a fast enough shutter speed?

I have used both expensive and inexpensive Canon and 3rd party lenses on my DReb, and have been able to create acceptable images from all of them.

D70FAN
03-01-2005, 07:42 AM
I too have been disappointed recently with Sigma lenses, especially the 18-125mm. So I returned it and took the re-stocking charge.

I have not tried Tamron lenses.

Sarah Joyce

I am surprised at your disappointment. I and several others on DCRP have been using the 18-125 for several months with the D70 (and Canon) and the pictures have been at least as good as the Nikkor 18-70 DX (and I assume the Canon kit) lens.

You can check out some examples here:

http://d70fan.smugmug.com/

The majority of these photos ere taken with the Sigma, and some with both Tamron (28-300) and Nikkor (18-70).

acoustech
03-01-2005, 07:44 AM
A couple of things to consider:

On your Elan 7, you probably never looked at images as closely as you look at the images created by your DReb

As for your brother's lens, is is possible that you forgot to lower the ISO, and the camera couldn't compensate with a fast enough shutter speed?


I think that is possible for sure with the ability to look at the images on my mac in photoshop but I'm not totally convinced. as far as my brothers lense goes, I do believe I tried shooting in auto/green which doesn't allow for iso changes but I'll have to go back and check the photos, you may be right.

thanks for the input, much appreciated. also, I noticed a few people seem to really like the canon EF 17-40mm f/4L USM, any additional thoughts about that lense anyone? thanks

speaklightly
03-01-2005, 08:58 AM
George-

Perhaps I just got a lemon. The kit lens that came with my Canon 20D is measurable better in quality than the Sigma. I bit the bullet and ordered a Canon 70mm-135mm IS lens, to see if I could really up my quality level.

Sarah Weber

D70FAN
03-01-2005, 12:47 PM
George-

Perhaps I just got a lemon. The kit lens that came with my Canon 20D is measurable better in quality than the Sigma. I bit the bullet and ordered a Canon 70mm-135mm IS lens, to see if I could really up my quality level.

Sarah Weber

Very weird. Guess there is a lemon sooner or later, but I know that Sigma has really upped their QC efforts in the past 3 years, so I am surprised. As you can see from the shot up on smugmug, even at f5.6 it's pretty decent.

Do you mean the 28-135 IS? Not much left on the wide angle side, and it's still consumer glass, but should work as well as the kit lens.

OR did you mean the 70-200 f2.8 L IS?!!! If it's the later then your bank account took quite a beating, but you bought one of the best that Canon makes.

Let us see how the new lens works. :)

ReF
03-01-2005, 02:41 PM
I think that is possible for sure with the ability to look at the images on my mac in photoshop but I'm not totally convinced. as far as my brothers lense goes, I do believe I tried shooting in auto/green which doesn't allow for iso changes but I'll have to go back and check the photos, you may be right.

thanks for the input, much appreciated. also, I noticed a few people seem to really like the canon EF 17-40mm f/4L USM, any additional thoughts about that lense anyone? thanks

i agree with the post about being able to inspect pixels. in fact, lenses are supposed to perform better on digitals with the crop factor vs. full frame because the softest part of a lens is usually the corners and with the crop factor they aren't even in the shot! the over exposeure does sound wierd. would you be able to try out that lens again?

as you have probably already heard, the 17-40L is a pretty nice lens. it's one of the most affordable high performace L lenses available. i own the lens and i don't have much to add other than saying that it has excellent flare resistance for a such a wide angle, in fact better than the 16-35L which is around $1300. in the worst, unavoidable flare conditions you'll get one or sometimes two tiny pink specs that are easy to clone out. compare that to the 28-135 IS(good lens IMO) in the same condition/location and you get a whole chain of gigantic flare rings going from one corner to the other (no filters attached).

speaklightly
03-01-2005, 05:11 PM
The Canon F 2.8 70mm-135mm IS arrived today and I have a photo sample for you. IMHO it is a good deal better than the Sigma 18mm-125mm lens that it replaced.

www.digicamlady.smugmug.com/gallery/418242

I hope that you will be able to see enough of the digital photo to see real detail.

Sarah Joyce

jamison55
03-01-2005, 05:24 PM
Nice color and sharpness, but what's with the grid pattern in the bokeh? When did this lens come out. I've never heard of it, and can't find any reference to it on Google...

jeisner
03-01-2005, 05:34 PM
^^^

I don't doubt it, as it is covering a 2x range as opposed to a 7x range! ;-)

Rex914
03-01-2005, 09:45 PM
70-135 f/2.8 IS? Never heard of it. Where did you buy it and how much did you pay? Why isn't it designated L glass (just based on its specs)?

speaklightly
03-02-2005, 10:14 AM
The problem was entirely me. My husband unpacked the box and handed me the lens. I installed it and quickly took one picture, and then left for the post office to get the bookm orders out.

When I came back, wide band had failed. So it is not till mid morning on the following day that I can tell you that I had mis-described the lens totally. That is why you have never heard of it.

It is a Canon EF 28mm-135mm F3.5-5.6 IS USM

I sincerely apologoize for my blunder.

Sarah Joyce

D70FAN
03-02-2005, 02:02 PM
The Canon F 2.8 70mm-135mm IS arrived today and I have a photo sample for you. IMHO it is a good deal better than the Sigma 18mm-125mm lens that it replaced.

www.digicamlady.smugmug.com/gallery/418242

I hope that you will be able to see enough of the digital photo to see real detail.

Sarah Joyce

Sorry, I did not see your Sigma results, and the posted shot is very nice, but no different than what I see from the Sigma/D70 combo for a similar shot.

Anyway, the new lens makes you happy and you had me impressed there for a while thinking you would drop some heavy coin for the Canon f2.8 L lens. ;)

D70FAN
03-02-2005, 02:17 PM
Hi Guys,

Here is an intersting link posted by TheObiJuan. You might find it enlightening when looking at lenses.

While Canons L glass is a leader in many catagories you will also find that they have a few (L) dogs and their consumer glass is generally ho-hum. At the same time Sigma and Tamron have some equals to L glass at less than half the price.

http://www.photozone.de/2Equipment/easytxt.htm#Ztele

Thanks TheObiJuan...

TheObiJuan
03-02-2005, 02:29 PM
hehe, thanks George. ;)

I am not a blind Canon L glass supporter, so that link really helped me decide what lenses to purchase.

I hope it helps all of you all.

D70FAN
03-02-2005, 03:11 PM
hehe, thanks George. ;)

I am not a blind Canon L glass supporter, so that link really helped me decide what lenses to purchase.

I hope it helps all of you all.

Spoken like a true Aggie. See now that... is the formal plural of Y'all...(except it's supposed to be all-a-y'all) ;)

ReF
03-02-2005, 05:11 PM
there is also a slightly out of date rating site at:

http://photodo.com/nav/prodindex.html

it's always good to have more than one source of info :)

D70FAN
03-02-2005, 05:17 PM
there is also a slightly out of date rating site at:

http://photodo.com/nav/prodindex.html

it's always good to have more than one source of info :)

Absitively and posolutly.

LoveOfSelene
03-02-2005, 06:24 PM
The Canon F 2.8 70mm-135mm IS arrived today and I have a photo sample for you. IMHO it is a good deal better than the Sigma 18mm-125mm lens that it replaced.

www.digicamlady.smugmug.com/gallery/418242

I hope that you will be able to see enough of the digital photo to see real detail.

Sarah Joyce

Is it in the EF catergory?
There isn't a 70-135 IS. Not that i know of anywho. It isn't posted on Canon either. Can you show a place selling one?

Added: if you look at the EXIF data they posted of the photo it states it's taken at 60mm (w/ the 1.6 FOV factor)

D70FAN
03-02-2005, 07:13 PM
Is it in the EF catergory?
There isn't a 70-135 IS. Not that i know of anywho. It isn't posted on Canon either. Can you show a place selling one?

Added: if you look at the EXIF data they posted of the photo it states it's taken at 60mm (w/ the 1.6 FOV factor)

Read back a little. It's the 28-135 f3.5-5.6 IS USM.

Rex914
03-02-2005, 10:03 PM
The art of choosing lenses is hard because there are almost never any general rules (unless you have unlimited money or do this for a living, then L glass is the way to go).

Not all Canon consumer lenses are bad. You just have to pick out the good ones from the not so good ones. Sigma has its share of lemons and diamonds (like the 70-200 f/2.8). Tamron too has a few great choices that get you most of what L glass gives, minus the rock-solid build and the price.

Read some reviews and please, please go to the store and try the lenses out, not just for optics and image quality but for size and build too. You might be quite surprised by the size (or lack thereof) of some of these lenses. What you see online differs from what you see in real life. This especially applies when you are looking for a walkaround/every day use lens. Make sure it isn't too heavy as to upset the balance of the camera when you are holding it. For example, placing the relatively heavy 24-70 L on something light like the Rebel XT wouldn't be terribly comfortable to hold. :)

LoveOfSelene
03-03-2005, 02:04 PM
Read back a little. It's the 28-135 f3.5-5.6 IS USM.

Sry my apologizes, I didn't even see the second page. :eek:
~Loveofselene

D70FAN
03-03-2005, 06:36 PM
Sry my apologizes, I didn't even see the second page. :eek:
~Loveofselene

No need to be sorry. It is easy to miss. :)