April 17, 2014, 04:10:34 AM

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Messages - candc

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1
Lenses / Re: Teleconverter advice
« on: April 15, 2014, 04:35:41 PM »
there are sample variations and some tc's seem to work better with certain lenses.

here is a site that did testing on all the converters available and it seems the kenko mc4 is the best on average across the frame, that makes it a real bargain and i might pick one up and try it.

http://www.traumflieger.de/objektivtest/open_test/telekonverter/overview.php


Am I reading the data in Traumflieger's site correctly? It seems to say the (presumably older) Kenko mc4 is not only better than the current Kenko version, but also that the mc4 is better (in the way it is being measured) than the Canon 1.4 Mark III? Please let me know if I am misreading the data or how this could be? Thanks!


yes, i found it interesting to see the results. what they are showing is the resolution of a lens and camera combo, a 5dii and 70-200 f4 at 200. the numbers below each tc are the drop in resolution center, mid, and edge, they also average the 3 and list them along with the resolution in lpm of all the tcs across the frame at the bottom.

others have pointed out that there are other attributes besides sharpness but according to the data on the site: the kenko mc4 is the sharpest tool in the shed

i also found it interesting that the series ii tc's are sharper in the center but not near as good in the mid frame and corners as the series iii which makes sense i guess if your lens is already a bit soft in the edges then losing another 500-600 lpm res is going to show pretty bad. it seems they choose to give up some center sharpness in order to get better mid frame and corner performance with the series iii


2
Lenses / Re: Teleconverter advice
« on: April 13, 2014, 07:51:23 PM »
there are sample variations and some tc's seem to work better with certain lenses.

here is a site that did testing on all the converters available and it seems the kenko mc4 is the best on average across the frame, that makes it a real bargain and i might pick one up and try it.

http://www.traumflieger.de/objektivtest/open_test/telekonverter/overview.php

3
Lenses / Re: Teleconverter advice
« on: April 13, 2014, 04:30:37 PM »
 I have the teleplus pro 300 dgx or what is called the "blue dot" version. I have read around the web and found from my own comparisons that the sharpness is on par with the canon. I havent had any metering or exposure problems, it works as it should. I haven't noticed any background blur/bokeh anomalies but then I was not looking for it so maybe there is some degradation there?

Here is a review of the kenko that may be useful to you because the lens that is used is the tamron 70-200


http://www.steveoakley.net/template_permalink.asp?id=263

4
Third Party Manufacturers / Re: Sigma 50mm f/1.4 Art Gets Reviewed
« on: April 13, 2014, 12:57:39 AM »
http://www.sonyalpharumors.com/sr5-et-voila-first-picture-of-the-sigma-24-70mm-f2-0-full-frame-lens/


Most seem to view that picture as a fake.

Yes, but rumor has it that it exists


I have from solid sources that it exists for sure. Maximum magnification is 0,86x and it has a new revolutionary 5x image stabilization system, AF faster than the EF 24-70 f2.8L II and it is weather sealed ... :P


Stop! It's cruel to tease me with that kind of talk!

5
Lenses / Re: Teleconverter advice
« on: April 12, 2014, 09:38:53 PM »
I have the kenko pro 1.4x and the canon 1.4xiii. They both have about the same IQ. The kenko is about half the price and works on just about everything, the canon has weather sealing.

6
Lenses / Re: Tamron 150-600mm AF servo issues?
« on: March 29, 2014, 09:28:14 AM »
After reading the posts here I did some experimenting with the lens on a 6d and a 70d. At 150 it works fine but at the longer focal lengths with the cameras set to ai focus and if you focus on a distant point and then quickly move to a near target or vice versa, the camera does not try to refocus unless you let go and repress the AF on button. This has never been a problem but I see its there once I looked for it. I use the lens in ai focus mode most of the time and it seems to track okay but it seems it will quit if there is a drastic change. Its not a big deal to me but something to keep in mind

you are the first who reports this with the 5D MK3, 6D and 70D.

unless it´s the typical behavior you also see with other original canon telephot lenses too.

this kind of "issues" attract people to test things and notice behavior they have not notice before and blame it on the lens.

there are no report from 5D MK3 user that the lens behaves strange.

for comparison i tried the same test using the sigma 120-300 and found that the bare lens is fine but if you add tc's then you get this same behavior so it seems an issue of max aperture and how well ai servo functions and not an issue that is specific to the tamron.

7
Lenses / Re: Tamron 150-600mm AF servo issues?
« on: March 28, 2014, 08:37:29 PM »
After reading the posts here I did some experimenting with the lens on a 6d and a 70d. At 150 it works fine but at the longer focal lengths with the cameras set to ai focus and if you focus on a distant point and then quickly move to a near target or vice versa, the camera does not try to refocus unless you let go and repress the AF on button. This has never been a problem but I see its there once I looked for it. I use the lens in ai focus mode most of the time and it seems to track okay but it seems it will quit if there is a drastic change. Its not a big deal to me but something to keep in mind

8
All three lenses – the new Compact Zoom CZ.2 15-30/T2.9, the CZ.2 28-80/T2.9 and the CZ.2 70-200/T2.9 – will also be available as a complete set (without transport case) for € 44,999 € or US$ 59,900 (excl. VAT)*.

No carrying case for the set? That's a flat out deal breaker for me, I am going to pass  for now.

9
I am still trying to understand why it is not guaranteed to get a sharp picture with AI server for stationary objects with shallow dof as long as light is enough. But there won't be any focus confirmation beep. Considering there is no AF lock with AI Servo, it is not possible to do focus and recompose with it right?. Do I need to always switch to one shot AF with focus and recompose.
Thanks

If you want to focus and recompose using ai servo then you need to use back button focus. In order for it to work you need to go to the customize settings for the shutter button and deselect the "half press initiates autofocus" option.. That way you use your center point to focus using the back button then let go, recompose and push the shutter button.

I always set one of the custom modes this way along with the fast tracking AF settings you see posted here and on other websites. That way you don't have to fiddle around and make a  lot of setting changes to switch back and forth.

10
Sounds like the options here are 1. extremely expensive and 2. Very inexpensive.  I've gone in between with the Sigma 120-300 f2.8 and canon version III teleconverters.  I'm very happy with the image quality so far comparing mostly to my old canon 100-400 and newer 70-300L.  The extra stop or so of light is great but the weight is significant.  Anyone else have the sigma and access to the tamron for comparisons?  I already know that the canon primes are slightly sharper and significantly faster for autofocus.

I've been considering the tamron for those times that I don't want to/can't take the heavy weights.

I have the sigma sport and the canon tciii's also. The sigma bare lens has noticibly better IQ and AF. The sigma with 1.4 has better IQ and AF, sigma with 2x is about the same or marginally better. The tamron is plenty sharp enough and the AF is fine for most everything. The only reason to use the sigma or any other lens in the tamrons range is if you need wider aperture for effect or light conditions. The tamron is so nice to carry and use because of its size and weight. I don't see myself using the sigma with the tc's much anymore but I am still going to keep it for the 120-300 f/2.8

11
considering the stature and eminence of the "brick chimney of glory" i reckon its okay to say that the crops all look really good, the ones from the canon combo are a bit better but you have to look close at 100% crops to see the difference. i don't think you would see a difference at normal viewing size. to me the tamron is like the 70-300l in that it will give you great result across its range in a relatively compact lightweight package. it might not have quite the sharpness or max aperture of the big canon primes but its really good, especially considering the cost, weight, size, and its a zoom

12
I did another comparison of the Tamron 150-600mm @600mm versus the Canon 300 f/2.8 II + 2xTC III on a 5DIII. A Tudor chimney overlooking my garden has very nice detail and shading in the bricks and mortar. In this collage of 100% crops of 800x700, which are testing the resolution at the limits, you can see that the Canon does have the edge, but the Tamron does very well.

I have made a personal decision to never take or comment on "brick wall of shame" crops. Maybe stating that goes against my conviction but I hold fast.

13
Lenses / Re: What to do with an old 17-85 f4-5.6 IS USM?
« on: March 11, 2014, 10:39:21 PM »
The lens will give decent results on the longer end and really benefits from software correction from dxo and DPP. I think its more useful  now because of that than it was a few years ago but there are better options nowadays

PS.  Wackocrash, do you play a 5150 or are you just crazy?

14
Lenses / Re: What to do with an old 17-85 f4-5.6 IS USM?
« on: March 11, 2014, 08:39:29 PM »
I have one of those and never use it anymore either. I was going to cash it in with adorama along with some other older unused gear but haven't gotten around to it.

15
Lenses / Re: Review: Tamron 150-600 f/5-6.3 Di VC USD
« on: March 09, 2014, 05:08:41 PM »
Interesting.

The Tamron at 400/5.6 looks a lot sharper and contrastier than the Canon 100-400 at 400/5.6
However, the Tamron at 600/8 looks weaker than a Canon 100-400 with a 1.4x TC

So, by inference: will the Tamron at 400 mm with a 1.4x TC attached outperform a Tamron set to 600 mm without the TC?

i gave it a try, nothing scientific but i have been using the lens for a while so i know what it looks like at 600, with the kenko 300 pro 1.4x at 400  it looks pretty good but not better than the bare lens at 600 and the af does not work very well at all. the lens wont fit on the canon 1.4xiii.

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