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Messages - TWI by Dustin Abbott

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421
6D Sample Images / Re: Anything shot with a 6D
« on: December 15, 2013, 08:28:07 AM »
6D + 24-70 f4 IS.

Shot on the Sussex coast at Adlebrough. A three frame stitch hand held, ISO 320.

Nice image.  I haven't seen much from the 24-70 f/4.  How do you like it?

422
Third Party Manufacturers / Re: A 40mm f/0.85 for Your EOS-M?
« on: December 14, 2013, 12:31:59 PM »
Wow.  The concept is cool, but how many people in the world are going to buy a two thousand dollar lens to mount on >$300 camera?

you'd be surprised the lengths some men will go to win a pissing contest

never underestimate the ego and its wallet :D

LOL.  I'll gladly take a loss here :)

423
Third Party Manufacturers / Re: Tamron 150-600 f/5-6.3 VC Availability
« on: December 14, 2013, 12:31:07 PM »
I really don't see a need to question Dustin Abbott's integrity on lens testing.  I would argue that large magazines and websites that make their money through advertising by big camera companies, or click-throughs  to stores  have more to gain by biased reviews. 

I think *all* reviews should be questioned, not so much because of intentional bias, but because of testing variations, and as mentioned by previous posters, variation between copies, esp. w/big glasss.  when the lens is out, we should have 5 or more reviews to look at, and unless there's some conspiracy, we should get a consensus on qualities based on bench tests.

My only concern is how will this lens work for me.  That's not just theoretical, it's practical.  For example,   I do not use a tripod, I shoot either handheld or with a monopod.  So even if I had a sharpest lens ever made, I would introduce some shake which would affect results.  I value a fast and effective stabilization system and that's my biggest hope for this lens.  I'm sure it will have to be stopped down at least one full stop for optimum optical sharpness, and that it will *not* be sharpest at 600mm.   So, the question is...how will this work for me at 400-500mm compared to a more expensive 100-400 L? or the Bigma???  I think we'll all find out soon and that will end the some of the speculation.

Good points, and one of the biggest reasons why Roger's conclusions are LensRentals are so valuable.  He has access to more copies than any reviewer I know, and I trust his assessment on the technical end.  My reviews are more about real world use, and are much less useful scientifically and hopefully a little more useful for those looking for practical application.

424
Third Party Manufacturers / Re: Tamron 150-600 f/5-6.3 VC Availability
« on: December 14, 2013, 12:28:40 PM »
There has never been any attempt to bias my results, and, since my primary occupation is as a pastor, I do value honesty.

Just to be clear, I'm not in any way suggesting dishonesty or bias on your part.  What I'm suggesting is that if you're testing lenses provided directly to you (as a reviewer) by the manufacturer, your results may be biased through no fault of your own, but due to the manufacturer hand picking and pre-testing the lenses you receive.  Also, pre-production lenses, by definition, aren't representative of lenses that come from the established production line.

If you like the lens well enough to purchase your own copy, I trust you will update your review if the production lens you buy differs substantially from the preproduction lens Tamron sent you for testing.

Absolutely.  I have ended up purchasing retail copies of several of the lenses that I have tested.  I have also updated reviews both on my website and on threads here with comments about issues that I have encountered with lenses/equipment after review.

Even my contact in Tamron Canada is surprised at how quickly this lens is coming to market.  They initially expected a longer roll-out period.  I am somewhat skeptical that the copy I get my hands on will be a pre-production copy with the release date now not much more than a month away.  I think that ship has sailed, and whoever shot these samples were using the pre-production units.

425
Third Party Manufacturers / Re: Tamron 150-600 f/5-6.3 VC Availability
« on: December 14, 2013, 12:25:22 PM »
I downloaded all of the sample TIFs from that page and examined them full size in Lightroom.  A few observations:


  • The BIF shots were all taken with a 1Dx, and it seems to be an earlier version of the lens because it just registers at 150-600mm

    The latter shots were taken with a 5DIII and the lens registers its proper name

    Sharpness at 600mm f/6.3 is not astounding, but it is far from bad.

    I have no question that good samples were chosen, so obviously YMMV

    Both color rendition and bokeh in both the highlights and the transition zone look quite good to me for a variable aperture zoom

    I'm glad the samples include BIF shots.  I hope this indicates reasonably good AF

    They are TIF files, and there is 0 sharpening on import, but I suspect they were sharpened before being flattened in PS because haloing appears pretty quickly when adding more sharpness in LR

    Stopping down even a bit seems to improve sharpness (in the samples) at 600mm

426
Third Party Manufacturers / Re: Tamron 150-600 f/5-6.3 VC Availability
« on: December 14, 2013, 11:35:24 AM »
I downloaded more of those TIF files, and I have to say that I'm pretty excited for this lens.  I'm not a birder or a real wildlife shooter, but if I could get this kind of reach with fairly good image quality it would be very appealing to me.  My investment would be more in line with the amount of time that I will actually be using the lens.  This is the reason that I have never purchased one of the great whites; I just wouldn't use it enough to personally justify the expense.  But absorbing this kind of cost even it only accounts for 5% of my overall shooting would be a different story.

427
Third Party Manufacturers / Re: A 40mm f/0.85 for Your EOS-M?
« on: December 14, 2013, 11:32:21 AM »
Wow.  The concept is cool, but how many people in the world are going to buy a two thousand dollar lens to mount on >$300 camera?

+1....however, there are some buy $10,000ish lens and mount on $2000 - $3000 cameras ;D

I did think of that, but we aren't exactly talking about the same market.  I personally will never pay big bucks for a lens that can only be used on the M.  I would prefer to spend that money on an EF lens that I could then adapt to the M if desired.

428
Third Party Manufacturers / Re: 150-600mm Sample Images
« on: December 14, 2013, 11:20:57 AM »
These are the sample images from Tamron's site.

http://www.tamron.com.hk/A011/

I thought this one looked very good for a 600mm zoom.  Certainly much better than 400mm + TC.
http://www.tamron.com.hk/A011/Fukuda_14.tif

Just brought that image (TIF) into Lightroom and looked at it @ 100%.  It is stopped down a stop from wide open (f/9), but even so it looks pretty sharp.  Individual hairs are resolved quite well.  Even better, the transition zone looks good (and that was a real weakness for their 70-300 VC).

429
Third Party Manufacturers / Re: Tamron 150-600 f/5-6.3 VC Availability
« on: December 14, 2013, 11:04:55 AM »
...even full size images are supposed to look very good according to my contact in the company.

They're going to send you a preproduction copy to review, they know you're going to publish that review, and a company rep tells you the images look very good.  Amazing...   ::)

While I understand your skepticism, if you have read my reviews you should know that I attempt to be completely frank about lens' weaknesses as well as strengths.  There has never been any attempt to bias my results, and, since my primary occupation is as a pastor, I do value honesty.  ;)

430
Third Party Manufacturers / Re: Tamron 150-600 f/5-6.3 VC Availability
« on: December 14, 2013, 11:02:22 AM »
For $1100, it wouldn't surprise me if an image cropped from the current Canon 100-400L at 400mm gives IQ that's at least as good as the Tamron at 600mm.

I haven't gotten my hands on the pre-release copy yet (hopefully over the next few weeks), but even full size images are supposed to look very good according to my contact in the company.  I'm skeptical at your statement.  The 100-400L is hardly a new design.  I wouldn't be surprised if this were true of a redesign of the 100-400LII, but not the older one (of which there is huge sample variation anyway).

The Sigma 150-500mm DG OS HSM APO is 10 years newer than the 100-400L, and in the same price range as the new Tamron (a little cheaper, but 100mm shorter). The cropped 100-400L is optically superior, as is the 100-400L + 1.4x TC (and the lens takes a big IQ hit from the TC).  So, I'm skeptical of your skepticism.   ;)

Also, since Tamron is sending you a copy, I'm frankly skeptical that your tests will be representative of production lenses (nothing against your testing, but I don't put much faith in reviews where the lens isn't purchased through a normal retail channel).

Fair enough.  Tell you what, if you hear/read that I am buying the lens for myself, that should send a pretty clear signal 8)

431
Third Party Manufacturers / Re: Tamron 150-600 f/5-6.3 VC Availability
« on: December 14, 2013, 11:00:48 AM »
...even full size images are supposed to look very good according to my contact in the company.

They're going to send you a preproduction copy to review, they know you're going to publish that review, and a company rep tells you the images look very good.  Amazing...   ::)

I want to see what happens when Roger from Lens Rentals runs a dozen through his test bench. Evaluation based on a single copy, although interesting, is inherently flawed as it is statistically insignificant, particularly when that single lens may or may not have been specially selected.

Also, when you look at the published MTF curves, it seems to indicate a soft lens once you get away from the center when it is zoomed out.....

We will likely find out later in January as I am sure Roger will have a few on order.

That is always one of the most important benchmarks for me, too.  It gives you a better sense of your "odds" in the sample variation lottery.

432
Third Party Manufacturers / Re: Tamron 150-600 f/5-6.3 VC Availability
« on: December 14, 2013, 09:11:57 AM »
For $1100, it wouldn't surprise me if an image cropped from the current Canon 100-400L at 400mm gives IQ that's at least as good as the Tamron at 600mm.

I haven't gotten my hands on the pre-release copy yet (hopefully over the next few weeks), but even full size images are supposed to look very good according to my contact in the company.  I'm skeptical at your statement.  The 100-400L is hardly a new design.  I wouldn't be surprised if this were true of a redesign of the 100-400LII, but not the older one (of which there is huge sample variation anyway).

433
Third Party Manufacturers / Re: A 40mm f/0.85 for Your EOS-M?
« on: December 14, 2013, 09:09:06 AM »
Wow.  The concept is cool, but how many people in the world are going to buy a two thousand dollar lens to mount on >$300 camera?

434
Reviews / Re: Review - Tamron SP 24-70mm f/2.8 Di VC USD with Pictures
« on: December 14, 2013, 09:07:07 AM »
1/15th second @ 70mm = no hesitation.  Just part of the reason why the Tamron is just a great travel lens.  And that bokeh ain't bad, either :)


435
6D Sample Images / Re: Anything shot with a 6D
« on: December 14, 2013, 09:05:58 AM »
Here's another - this one from the souq in Old City Jerusalem.  The Tamron is a great travel choice, in part because I can shoot shots like this @70mm and 1/15th shutter speed without even worrying for a moment about sharpness.


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