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Is this Tamron Adaptall SP 500 f8 malfunctioning?
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Is malfunctioning?
Yes
8%
 8%  [ 2 ]
No
44%
 44%  [ 11 ]
Not conclusive in any side.
48%
 48%  [ 12 ]
Total Votes : 25



PostPosted: Sat Feb 25, 2012 8:44 am    Post subject: Reply with quote
I really think that it is possible to do videos with this lens in other conditions with other equipment.

I just think that the problem is that the video is not conclusive enough by itself, it looks like there is no dampening enough. Every time he focuses the frame moves. This added to the spontaneous selfixing theory is what makes me doubt.

But I think that I will offer him a limited 3 month guarantee to see if I can forget the problem. I don't want to lose more time with this.


PostPosted: Sat Feb 25, 2012 11:03 am    Post subject: Reply with quote
About this lens. I own 55B and it is very good. It is sharp.
In his video, looking at the first "metal chimney" it seems the lens is not sharp. But it would have been better to try to focus on the brick wall behind.
Looking at the statues, depth of field is very short when we shoot at this distance. It seems that it is better but not at all at the level of my lens.
I'm wondering what is his camera. Do you know ?

Speaking about sharpness, here are some of my samples on 5D MkII. Full frame sensor and the high quality of the viewfinder helps a lot.
To see bigger size, click on pictures to open in new window.

short distance :
1/500s - iso 400 - handheld

1/60s - iso 1600 - monopod


medium distance :
1/1250s - iso 200 - tripod


long distance :
1/250s - iso 800 - handheld

1/2000s - iso 800 - handheld



I tried a quick video with my 5D Mk2 handheld. It's very shaky ! But IQ is sharp.
In your buyer's video, it's like there is some haze.
But again, what is its camera and what are the results when he shoots photographies ?


PostPosted: Sat Feb 25, 2012 12:19 pm    Post subject: Reply with quote
Olivier wrote:
About this lens. I own 55B and it is very good. It is sharp.
In his video, looking at the first "metal chimney" it seems the lens is not sharp. But it would have been better to try to focus on the brick wall behind.
Looking at the statues, depth of field is very short when we shoot at this distance. It seems that it is better but not at all at the level of my lens.
I'm wondering what is his camera. Do you know ??


He is using a Canon APS-C, so magnification is bigger (500 * 1.6 = 800mm FOV) and the image circle is cropped (less sharpness at same MPx count and more diffraction at fCool. The point is that after the lens was measured as 100% performing he felt in the right to don't have to prove anything to me, so no way for asking for a still or a new video.


PostPosted: Sun Feb 26, 2012 11:01 pm    Post subject: Reply with quote
Here is a video made with this Tamron SP 500 F8 mounted on 5D MkII :
http://vimeo.com/37477351
In HD and you can enlarge it.


PostPosted: Mon Feb 27, 2012 7:46 am    Post subject: Reply with quote
Hey Olivier, can you share more data about the setup?

It looks like an 5d2 + tamron.

I Would like to know the focusing distance, the behaviour of the setup just the first moments after you focus (time to gain stability, if any), and which tripod setup (weight).

What that video clearly proves is that if done well it can be used for video on the 5d2 with excellent results.


PostPosted: Mon Feb 27, 2012 9:09 am    Post subject: Reply with quote
rafa1981 wrote:
Hey Olivier, can you share more data about the setup?
It looks like an 5d2 + tamron.
I Would like to know the focusing distance, the behaviour of the setup just the first moments after you focus (time to gain stability, if any), and which tripod setup (weight).
What that video clearly proves is that if done well it can be used for video on the 5d2 with excellent results.

Hi Rafa.
Lens : Tamron SP 500mm F8 adaptall-2 55B
DSLR : Canon EOS 5D MkII
Focusing distance to the subject : 12 meters
Focusing technique : first, I focused with the viewfinder on the subject place ; second, liveview mode, magnify 5x to adjust focus precisely ; third : push slightly the "SET" button to launch the video recording.
My lens has very smooth focusing ring. It's very important because you have to turn the ring just 1° to be in or out of focus...
Time to gain stability : 1/4s ? The video is direct out of cam : no cutting.
Lens mount used to screw on the quick lock plate of the tripod.
Tripod : Manfrotto 190XProB. Weight : 2,55 Kg + Cam and lens. Height : column down + head, I think it was at 135-140cm.
http://www.manfrotto.co.uk/professional-aluminium-tripod-black-without-head
Head : 804RC2
http://www.manfrotto.co.uk/basic-pan-tilt-head-with-quick-lock

I've uploaded another one I took with pan movement. I made the mistake to left my hand on the grip.
http://vimeo.com/37512771
NB : Vimeo converted it and it is not HD... I don't know why.

I'm really surprised with its results and pictures he sent you. He should try stills and send them.
This lens may have problems.
Could you send us his files so that we could have a look at his exifs ?

Cheers,

Last edited by Olivier on Mon Feb 27, 2012 5:05 pm; edited 3 times in total


PostPosted: Mon Feb 27, 2012 4:51 pm    Post subject: Reply with quote
rafa1981 wrote:
Xpres wrote:
I'd be very surprised if anyone managed to get very sharp looking video from this sort of set up. Getting good stills needs a very sturdy tripod set up and cable release etc... and still needs high shutter speeds. I used the 500 for a bit with an EP2 which worked OK, but if you pixel peep I needed at least 1/1000 even with the tripod. I think video is a non starter if you want it that sharp.
Your buyer needs to take some stills as suggested... but really, as a good seller, you need to take the lens back if he's not happy, although at his expense as there's probably nothing wrong with it....


He sent me this:



And this:




I would say that he needs a better tripod and his camera may have some recoil as well.
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