Tamron Zoom 18-200mm - Not bad for a $399 lens.

Tamron AF 28-300mm f/3.5-6.3 XR Di LD Aspherical IF for Canon

08/12/2005 09:58:41 PM · #1

Tamron Zoom Super Wide Angle 18-200mm f/3.5-6.3 XR Di-II LD Aspherical (IF) Macro Lens for Canon Digital EOS

A $399 lens but to me seems good at 200mm (300mm equivilant). No L lens but good. What do you think?

A couple of questions If you have time:
1. How does it look for a cheep lens?
2. I had to pan to get the shot, is that what caused the spiraling edges of the propeler blades?

And BTW those birds were getting out of the way.... lol

08/12/2005 10:16:35 PM · #2

Looks pretty good to me. Not a "scientific" test, of course, but I don't see any glaring deficiencies in this single, 640-pixel image.

I think (but am not positive) that the new turboprop blades are a composite material that is designed to flex on rotation. I think what you're seeing is real. I could be wrong though.

Robt.

Tamron AF 28-300mm f/3.5-6.3 XR Di LD Aspherical IF for Canon

08/12/2005 10:46:14 PM · #3

Thanks Robert. If you would like to see the original you can view it here to see what you think of the lens.

Any comments on its performance would be helpful since I only have a 14 return/exchange option.

Man_Called_Horse

Canon EOS-300D Rebel

08/12/2005 10:48:08 PM · #4

6.3 on a 200mm. hmmmmmm......

one word.

SLOW.

nice pix anyway, good luck.

Neeshac

Sony DSC-H5

08/13/2005 01:00:25 AM · #5

Very nice shot johnson!

[quote]
I think (but am not positive) that the new turboprop blades are a composite material that is designed to flex on rotation.
[/quote]

Although it certainly looks as if the blades are flexing it is really not the case. You will only find flex of this nature in helecopter blades and that is due to the stress applied due to extreme amounts of lift generated primarily during take-off and landings. Blades on turbo props need to be extremely rigid to generate thrust while flexable blades on helecopters assist in generating lift.

08/13/2005 01:09:27 AM · #6

Originally posted by SDW65:

Two things:

1. What camera settings re sharpness, contrast etc? Ho wemuch USM or whatever in PS? Cuz I am seeing some distinct haloing of the dark wing against the lighter sky here...

2. Thinking about the props, and given that my flex-prop has been debunked, it occurs to me that it's almost certainly an artifact of the focal plane shutter, whish is a slit moving across the sensor; the blades are moving faster than the slit, so deformation is occurring.

Robt.

Tamron AF 28-300mm f/3.5-6.3 XR Di LD Aspherical IF for Canon

08/13/2005 01:18:42 AM · #7

Originally posted by Neeshac:

Very nice shot johnson!

[quote]
I think (but am not positive) that the new turboprop blades are a composite material that is designed to flex on rotation.

Although it certainly looks as if the blades are flexing it is really not the case. You will only find flex of this nature in helecopter blades and that is due to the stress applied due to extreme amounts of lift generated primarily during take-off and landings. Blades on turbo props need to be extremely rigid to generate thrust while flexable blades on helecopters assist in generating lift. [/quote]

Maybe I didn't explain my self (I'm good about that-lol). I talking about the trailing circles from the blades. See the two pictures below. I was wondering what would cause that. The photo was taken at 1/1000 and no other lights or bright colors are trailing.

kyebosh

Canon EOS-20D

Canon EF 80-200 f/2.8L

08/13/2005 01:20:15 AM · #8

I dunno? Smoke rings?

skylen

Nikon D200

Nikon AF-S DX Zoom-Nikkor 18-70mm f/3.5-4.5G IF-ED

08/13/2005 01:25:18 AM · #9

Originally posted by SDW65:

Originally posted by Neeshac:
Very nice shot johnson!

[quote]
I think (but am not positive) that the new turboprop blades are a composite material that is designed to flex on rotation.

Although it certainly looks as if the blades are flexing it is really not the case. You will only find flex of this nature in helecopter blades and that is due to the stress applied due to extreme amounts of lift generated primarily during take-off and landings. Blades on turbo props need to be extremely rigid to generate thrust while flexable blades on helecopters assist in generating lift.

Maybe I didn't explain my self (I'm good about that-lol). I talking about the trailing circles from the blades. See the two pictures below. I was wondering what would cause that. The photo was taken at 1/1000 and no other lights or bright colors are trailing.

[/quote]

Wow that is really bizarre. Like some kind of UFO sighting or ghost sighting. The prop-ghost.

Canon EF 24-105mm f/4.0L IS

08/13/2005 01:44:50 AM · #10

Ah, THOSE... Wouldn't be surprised if those marked how much you panned and how many revolutions the props made in 1/1000th of a second... I donno... I'm over myhead.

R.

kyebosh

Canon EOS-20D

Canon EF 80-200 f/2.8L

08/13/2005 01:49:09 AM · #11

Originally posted by bear_music:

Ah, THOSE... Wouldn't be surprised if those marked how much you panned and how many revolutions the props made in 1/1000th of a second... I donno... I'm over myhead.

R.

They made not even one rotation by the looks of it.

Neeshac

Sony DSC-H5

08/13/2005 02:00:09 AM · #12

Ok before I answer I suppose I should qualify. I am an aircraft mechanic and have been for longer than I want to admit here. :P What you see there is the result of a high humidity kind of day. The heat generated at the wingtips of the rotor have caused vapor trails of a fashion to form around the outer leading edge of the props. A not so common phenomenon and really neat to see in a still image. Impressive and now a part of my favorites!

carlos

Canon EOS-50D

08/13/2005 11:58:07 AM · #13

Yep! I agree. You can see something similar on the rear spoilers of F1 race cars on rainy days, a sort os "wings" is formed out of water vapour as the car quickly accelerates.

JordanZ

Canon EOS-20D

Tamron SP AF 28-75mm f/2.8 XR Di for Canon

08/13/2005 12:06:02 PM · #14

I just got this lens the other day and really like it so far. The images look fairly sharp. This is also my first zoom lens for my dSLR and was the only thing in my price range though.

Ivo

08/13/2005 12:14:15 PM · #15

Propellor Vortices. Check it out:

//www.galleryoffluidmechanics.com/vortex/am1205.htm

Tamron SP AF 28-75mm f/2.8 XR Di for Canon

08/13/2005 12:34:16 PM · #16

Originally posted by kyebosh:

Originally posted by bear_music:
Ah, THOSE... Wouldn't be surprised if those marked how much you panned and how many revolutions the props made in 1/1000th of a second... I donno... I'm over myhead.

R.

They made not even one rotation by the looks of it.

As expedted, shot down again. Teach me to venture opinions on things I know nothing about :-) Plus ommon sense woudl have shown me this rather obvious fact. Chalk it up to late-night opacity-of-the-brain.

R.

strangeghost

Canon EOS-7D

08/13/2005 01:45:44 PM · #17

I learn something new everyday on DPC! Cool phenomenon captured on film, ur, sensor.

strangeghost

Canon EOS-7D

Tamron SP AF 28-75mm f/2.8 XR Di for Canon

08/13/2005 01:47:23 PM · #18

SDW, can you post a few of this lens at the 18mm end? Smartypants is contemplating spending some more of her b-day money on a superzoom and this is one of the leading candidates.