September 02, 2014, 11:03:43 AM

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Messages - AlanF

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406
Use one for my 300/2.8.  Had them for 400/5.6 and 100-400. Very well made and designed. 

407
Hi! I am an enthusiast who does a fair bit of birding and wildlife shooting. I am trying to optimize my longer range lens collection without breaking the bank. I have used the Canon 400mm f/5.6 L. I found it a great lens in many ways. However I had difficulty handholding it and getting decent shots (I am aware of upping the shutter speed, using a tripod or monopod - I would like a lens with good image stabilization). I know others find it quite handhold able but that is not my experience. I am presently using the 300mm f/4 L with the Extender EF 1.4x III and am quite happy with it. I would like something longer, however. I had the Sigma 150-500mm for a while. It took good pictures but was a bit soft on the long end where my interest lies. I know the Tamron 150-600mm is just out, is decently priced and has some positive reviews. Does anyone have any initial thoughts on whether the Tamron at the 600mm end would be reasonably comparable to the Canon 300mm f/4 L with the 1.4 extender and is the Canon extender usable on the Tamron and, if it is, what are the likely effects on sharpness? I shoot with both a 7D and 5D Mark II. Thanks for any advice you may have. I will wait for more reviews but would appreciate any thoughts with what we now know. :)

It's difficult to judge how good the lens is at 600mm from published images because few have been taken under optimal conditions. The published ones of birds are mainly at f/6.3 where the lens is softest. It does seem from the MTFs and good images, that at 400mm, the Tamron is close to the 100-400L, which means similar to or better than your 300 + 1.4xTCIII. It looks like that the Tamron at 600mm and f/8 - f/11 would give a significantly better image than the 400mm lens cropped.

The use of extenders is probably problematic. The Canon extender will narrow the maximum aperture to f/8 and your 7D would not autofocus.  On a camera that will, such as the 5DIII, you would have to use f/11 - f/16 to get into the sharper regions at 600mm, drawing you into high iso and extenders aren't usually good unless the naked lens is very sharp.

408
It is a closely guarded secret. Unfortunately, the secret has become exposed: it is written immediately under the photo (and under all my posts) that I have a 300mm f/2.8 and 2xTC. The data are also in the exif of the photo that it was taken on a Canon 7D with 300mm f/2.8 and 2xTC.

I always download photos that I discuss and check their exifs for information. In turn, I always included the exifs on what I upload so anyone can find out what mine were taken on and with.

well then it´s not too hard to write that info instead to expect that others check every photos exif.... not?

and from what is see in dustin´s review, you choose a bad example... to make a point?
there are cleary better images at 600mm that show the potential of this lens.

You write nasty little comments like "how long do you take pictures?". You clearly like making points and getting personal, I don't like doing either. In common with most CR regulars, I try to look at all evidence objectively and weigh up what is in front of us. From what I have seen so far the Tamron 150-600 lens is excellent value for money and is better than the 100-400.  It is not up to the primes but is a good alternative if you are not looking for the highest resolution. The ephotozine image at 600mm is OK but still somewhat soft. I might buy one because it does look like a very good lens, but will wait until the spring to see what Canon comes up with. I sold my 100-400 yesterday to make room for a new lens.

409
I was really excited about this lens and have put my 100-400L up for sale in anticipation of buying it. Now, I am very worried about the Tamron's performance at 600mm. Here are more of your crops at 600mm and f/6.3. For the first, I calculate the original to have been 1100x830 pixels, and the for the second, the duck's head, 1300x1300. Their quality has put me off the lens as I usually get very sharp images at those sizes.

how long do you take pictures?  ;)

noticed that your images with the SX50 are taken in bright harsh sunlight as it seems.
the one crop from him you showed not. seems like a dull overcast day to me the image was taken.

im still unable to read his review. now i get a blank hoster page yesterday it was 404.
but i will have a look at the review if possible.

fact is, who compares this tamron lens to a 600 f4 has much to learn.
people with a signature as long as yours should know what they can expect for 1000$

I was comparing it "with" another lens and not "to". And, it was not a 600mm f/4. The duck's head taken with the Tamron was in perfectly good light and you can see that it is soft, irrespective of any comparison..


all i can see is your examples. i will build my opinion when i have seen the whole review.

and to what 600mm you compare it with... is that a secret?
if you make such comparisation it would only be logical to give out such infos.  ::)
no wonder people assume wrong things.

It is a closely guarded secret. Unfortunately, the secret has become exposed: it is written immediately under the photo (and under all my posts) that I have a 300mm f/2.8 and 2xTC. The data are also in the exif of the photo that it was taken on a Canon 7D with 300mm f/2.8 and 2xTC.

I always download photos that I discuss and check their exifs for information. In turn, I always included the exifs on what I upload so anyone can find out what mine were taken on and with.

 

410
Don
You are absolutely right about the slow AF. If Canon is able to introduce dual-pixel technology to their superzooms it will be a complete game changer. The AF should then be some 5x faster and the SX50 successors will be in real competition with bargain-basement priced zoom supertele lenses.

411
I was really excited about this lens and have put my 100-400L up for sale in anticipation of buying it. Now, I am very worried about the Tamron's performance at 600mm. Here are more of your crops at 600mm and f/6.3. For the first, I calculate the original to have been 1100x830 pixels, and the for the second, the duck's head, 1300x1300. Their quality has put me off the lens as I usually get very sharp images at those sizes.

how long do you take pictures?  ;)

noticed that your images with the SX50 are taken in bright harsh sunlight as it seems.
the one crop from him you showed not. seems like a dull overcast day to me the image was taken.

im still unable to read his review. now i get a blank hoster page yesterday it was 404.
but i will have a look at the review if possible.

fact is, who compares this tamron lens to a 600 f4 has much to learn.
people with a signature as long as yours should know what they can expect for 1000$

I was comparing it "with" another lens and not "to". And, it was not a 600mm f/4. The duck's head taken with the Tamron was in perfectly good light and you can see that it is soft, irrespective of any comparison..

412
If you think the comparison with an expensive lens unfair, what do you think about a $300 SX50 giving better performance than the $1100 lens, with a whole camera for a third of the price?

This remains to be demonstrated.

Based on the crops of the birds shown in this review, it has been demonstrated - just look at them, they are unacceptable (to me, but maybe they are acceptable to you). But, if those photos are just very poor examples and the lens can do much better, then I will of course change my mind with enthusiasm and buy one.

413
I was really excited about this lens and have put my 100-400L up for sale in anticipation of buying it. Now, I am very worried about the Tamron's performance at 600mm. Here are more of your crops at 600mm and f/6.3. For the first, I calculate the original to have been 1100x830 pixels, and the for the second, the duck's head, 1300x1300. Their quality has put me off the lens as I usually get very sharp images at those sizes.

For comparison, I have shown a sparrow of similar original crop taken with an SX50 at 1200mm equivalent (it's not the best quality) and a shoveler duck's head I took a week or so ago with a 70D and 600mm lens.

Is that a $12,000 lens you're comparing this $1k lens to? Not exactly a fair comparison. Plus, your statement doesn't really make sense...how this guy performs at 600mm should have no effect on you selling your 100-400m.

I put up my lens for for sale in anticipation of buying this lens, which shows a positive attitude to the Tamron in advance and not scepticism. If you think the comparison with an expensive lens unfair, what do you think about a $300 SX50 giving better performance than the $1100 lens, with a whole camera for a third of the price?

414
I was really excited about this lens and have put my 100-400L up for sale in anticipation of buying it. Now, I am very worried about the Tamron's performance at 600mm. Here are more of your crops at 600mm and f/6.3. For the first, I calculate the original to have been 1100x830 pixels, and the for the second, the duck's head, 1300x1300. Their quality has put me off the lens as I usually get very sharp images at those sizes.

For comparison, I have shown a sparrow of similar original crop taken with an SX50 at 1200mm equivalent (it's not the best quality) and a shoveler duck's head I took a week or so ago with a 70D and 600mm lens.

415
Dustin
I am comparing some of your bird photos with examples I've taken by downloading some of your crops. However, I don't know whether yours are 100%. For example, this one is 1024x1024 but I estimate from the full shot that it is about 1600x1600 in the original and has been reduced. Is this so?

 

416
Does anyone have a link to measured MTFs for the Canon 300mm f/2.8 II + 2xTC at 600mm? (Not the Canon published calculated ones).

417
in short.. you get the EF 100-400mm quality from 150-400mm on the tamron ....plus an additional 200mm with not so good resolution.

now the question is how good is VC and AF with this lens.

Indeed.  It seems to lose ~25% of its peak resolving power (at 400mm) by the long end.  I wonder how that compares to cropping the Canon 100-400L?  Also, 600mm will have thinner DoF, meaning AF accuracy is more important.  A higher shutter speed may also be required, meaning higher ISO. 

Still, the new lens delivers surprisingly good resolution performance for the focal length and cost.

I ask the same question. The centre MTF at 400mm is 945 and 710 at 600mm, and cropping at 400 would give a similar resolution to 600mm. However, there are reports that lowering the aperture to f/8-f/11 gives a significant increase in sharpness. A pity Roger didn't measure that. We'll have to wait for SLRgear, lenstip. photozone or TDP to deliver the goods.

418
Software & Accessories / Re: Adobe Lightroom for iPad Coming Soon
« on: January 18, 2014, 03:13:39 AM »
The usual sales model for iPad apps is to sell a very high number at low unit price.

419
Third Party Manufacturers / Re: Tamron 150-600 f/5-6.3 VC Availability
« on: January 16, 2014, 02:16:49 PM »
As this is a variable aperture lens, does anybody know at what focal lengths the aperture changes happen?

I do, and I will be sharing that exact information in my upcoming review (which will be allowed to go live next week).

Why are you holding back such a small snippet of information - it will hardly spoil your review?
maybe it's because he is under nda ?

Dustin
Are you under a non-disclosure agreement or are you just holding back information?

420
Third Party Manufacturers / Re: Tamron 150-600 f/5-6.3 VC Availability
« on: January 16, 2014, 12:46:51 PM »
As this is a variable aperture lens, does anybody know at what focal lengths the aperture changes happen?

I do, and I will be sharing that exact information in my upcoming review (which will be allowed to go live next week).

Why are you holding back such a small snippet of information - it will hardly spoil your review?

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