chanjyj
New Member
aha! I asked him how close he is to subject, but also forgot to ask him focal length!
Any good alternative to AF-S DX 17-55mm f/2.8G IF-ED ?
- Thread starter jamesow
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aha! I asked him how close he is to subject, but also forgot to ask him focal length!
RealCaster
Member
I tried that But I have no problem... Maybe we should list out the equipment & compare
D200 + SB800 (bought 2 weeks ago) and Tamron 17~55mm (2 weeks ago too)..
So far very good exposure....for full range and all difference lighting condition. ...But I set to TLL, BL, FS...
Could it be due to the issue of the older tamron, I don't think the issue of sending wrong distance info the camera is that difficult to correct. If I am tamron and seeing the issue, I would quickly rectify the issue and pretent nothing actually happens...:bsmilie:
But then again, when I zoom my Tamron, the distance is reflected on the display of the SB800 and the readings is correct, so I guess it is sending the correct distance to the camera... hmmm........
Maybe the tamron user can have a meetup to compare
Hi Humble Only CSers,
I also came across this website claiming that the Tamron A16 lens report the wrong focal distance to the camera in TTL-BL mode therefore causes over-exposed issue.
I did a small test to confirm it's claim and would like to share with all humble-only CSers here :bsmilie: I have also used the same ExifTool tools to ensure consistancy with it's claim.
Test equipment:
Camera: Nikon D200
Lens: Tamron 17-50mm SP f2.8
Flash: Nikon SB-600
Focal length: 50mm
Focal distance: 45mm
Aperture: f3.5
Exposure: 1/60s
ISO: 100
Flash mode: 1 shot using TTL and 1 shot using TTL-BL
Shot using TTL - download image
Shot using TTL-BL - download image
Here is the link to both images with full EXif.
Both files reported similiar focal distance at 45mm from ExifTool and I dun see any over-exposed issue. If you really wants to verify, you can copy this 2 image and download the ExifTool to check for yourself.
Again not all Tamron has this issue :nono: If any bros or sista really encountered over-exposed issue, I really feel sorry for that. I suggest you may want to do a test to confirm if it's wrong focal distance causes it. I would have turn to the agent to insist a swap to a good working lens else full refund if this had happens to me. Just me 2 cents.
I'm still supportive to Tamron and this A16 really serve my needs other that focal length limited to 50mm. I'm also keen in their 28-300mm VC, can't wait for the release for Nikon.
As said, I'm just here to share and not to justify for anything. Just that I cannot tahan one bamboo beat one boat of people (in chinese la) hahaha........
Please do not ask me to verify anything further as I'm not keen to do so. It's all up to your own judgement and believe. I'm only doing a little test hope to benefit your guys here.
Thanks and take care.
I also came across this website claiming that the Tamron A16 lens report the wrong focal distance to the camera in TTL-BL mode therefore causes over-exposed issue.
I did a small test to confirm it's claim and would like to share with all humble-only CSers here :bsmilie: I have also used the same ExifTool tools to ensure consistancy with it's claim.
Test equipment:
Camera: Nikon D200
Lens: Tamron 17-50mm SP f2.8
Flash: Nikon SB-600
Focal length: 50mm
Focal distance: 45mm
Aperture: f3.5
Exposure: 1/60s
ISO: 100
Flash mode: 1 shot using TTL and 1 shot using TTL-BL
Shot using TTL - download image
Shot using TTL-BL - download image
Here is the link to both images with full EXif.
Both files reported similiar focal distance at 45mm from ExifTool and I dun see any over-exposed issue. If you really wants to verify, you can copy this 2 image and download the ExifTool to check for yourself.
Again not all Tamron has this issue :nono: If any bros or sista really encountered over-exposed issue, I really feel sorry for that. I suggest you may want to do a test to confirm if it's wrong focal distance causes it. I would have turn to the agent to insist a swap to a good working lens else full refund if this had happens to me. Just me 2 cents.
I'm still supportive to Tamron and this A16 really serve my needs other that focal length limited to 50mm. I'm also keen in their 28-300mm VC, can't wait for the release for Nikon.
As said, I'm just here to share and not to justify for anything. Just that I cannot tahan one bamboo beat one boat of people (in chinese la) hahaha........
Please do not ask me to verify anything further as I'm not keen to do so. It's all up to your own judgement and believe. I'm only doing a little test hope to benefit your guys here.
Thanks and take care.
chanjyj
New Member
hmmm... you shot at 50mm, focal distance 45mm? is that the MFD (minimum focussing distance) of the tamron?
the MFD of the Tamron 17-50 is 0.27m IIRC.
@snapworks: Focal Length and Focal Distance are different things. Focal length is the range of the zoom that you are at ie 17mm 24mm 35mm etc.
Focal Distance is the distance from the camera's image plane to the point of focus.
I know focal length and distance are different thing otherwise I would not stated there.:bsmilie: I indicated the focal distance because there are reports claims that the len report wrong focal distance to the camera therefore causes over-exposed issue when using TTL-BL flash mode. If you download the images and the EXifTools, you are able to view both images report similiar focal distance. You can read from the link I posted above.
Oh yeah. you shot the SB-600 bounced is it? Could you try direct flash? (I dun need exif lah.. I believe you. Anyway your pics here have been metascrubbed, aka wiped clean of exif info :bsmilie
Please la, dun ask me to test again since both the images proven there's is no issue with the lens. By using direct or bounce does not resulted in the lens reporting wrong focal distance so I dun see a need in that. If it really does, then it is cause by the flash :bsmilie:
BTW, I have added the link to download the images with full EXif, you can download them and use EXifTools to view them if you like to. Cheers.....
There is a difference. When you use TTL-BL with direct flash, then the distance reporting is of paramount importance. It is with TTL-BL and direct flash where the erratic behaviour appears.
chanjyj
New Member
Yah. he explained what I was lazy to say.
You know how to check image-focal plane difference? You have to use another lens to get the 1st accurate reading. Then, you use the Tamron to get a 2nd reading.
If both readings show a difference in subject-camera focal plane difference, that is the true, and correct test. If both readings show roiughly the same result (give or take a few mm) then I have to say your Tamron is correct.
Right now your test.. I have no idea how you conducted it. Seems like it was with the same lens all the time. TTL and TTL-BL will not affect subject distance-focal plane readings. The only way you will know the CORRECT subject-focal plane distance is with another lens. Then you can compare with your present Tamron. The other lens, in science, is called a "constant".
Anyway if you are happy with your lens good for you.
chanjyj
New Member
Dear Sirs
Thank you for your email enquiry.
As requested, we are pleased to offer as follows:
Tokina 16-50mm f/2.8 @S$933.00
Currently in stock for Nikon and Canon Mount.
E & OE
Please note that the above price(s) are inclusive of 7% GST, and valid for a period of 1 week from the date of this email, after which any changes will be made without prior notice. The acceptable mode of payment is by CASH ONLY.
Availability of the above item(s) is subjected to prior sales, unless otherwise stated. As such, you are advised to contact us prior to your visit at any of our outlets to ensure that there is sufficient stock.
In addition, please present this email IMMEDIATELY when you are served by our sales staff so that the above prices are accorded to you. Any purchase made for the quoted product(s) w/o this email, or prior to receiving this email, will render this quote invalid.
Thank you for your email enquiry.
As requested, we are pleased to offer as follows:
Tokina 16-50mm f/2.8 @S$933.00
Currently in stock for Nikon and Canon Mount.
E & OE
Please note that the above price(s) are inclusive of 7% GST, and valid for a period of 1 week from the date of this email, after which any changes will be made without prior notice. The acceptable mode of payment is by CASH ONLY.
Availability of the above item(s) is subjected to prior sales, unless otherwise stated. As such, you are advised to contact us prior to your visit at any of our outlets to ensure that there is sufficient stock.
In addition, please present this email IMMEDIATELY when you are served by our sales staff so that the above prices are accorded to you. Any purchase made for the quoted product(s) w/o this email, or prior to receiving this email, will render this quote invalid.
At first was claimed that this lens has problem when using TTL-BL, so the test was to compare both TTL against TTL-BL and both reported identical. Now becomes comparing with another lens and I think it is never going to end. Even if 2 different lens reported different focal distance so which is correct? To me, as long as I don't have over-exposed issue be it using whatsoever flash mode, I'm fine. I'm going to stop here and will not be doing any further test as mentioned earlier. I think it only fair that individual to select their own preference. Cheers....
the second lens becomes a 'constant'?... in science? are you sure? :think:
gosh. 'constant'? hahahhah
i suppose you mean reference?
it's back to school for you.
anyway, a more objective way is to gauge the subject from the ccd plane (don't need to be that accurate). if the focus distance is clearly say.... 30cm away and the lens reported 50cm or more, then you'll have FV problem.
Lenses' focus distance is not that precise. but being too way out of accuracy would be a problem.
i checked 2 copies. one has no problem at all.
the second one did not consistently exhibit the problem.
design defect versus manufacturing defect?
chanjyj
New Member
yep.. back to school for me :bsmilie:
chanjyj
New Member
No idea. Anyway to each his own. If you're comfortable with the Tamron great for you. For me, who still acts like a PJ, many of my shots are on P mode and TTL-BL so I cannot afford to have any errors.
(But the damned nikon 17-55mm is too expensive!)
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