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07-23-2008, 12:33 PM   #1
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Tamron 1.4x Pz-AF MC4 + Tamron 70-300 Di LD Macro

I managed to buy it from marketplace. Thanks to seller! I love this adapter that turns my Tamron 70-300 Di LD into 420mm in its long end and I got to try it out with few test shots. PF/CA become more apparent and frequent but the sharpness at 420mm is still quite good. All shots are hand-held in iso 400.


Thanks to all those who suggested that the adapter works reasonably well with Tamron 70-300 Di LD and I can concur to that.

Hin

07-23-2008, 12:36 PM   #2
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Wonderful work, hin.
07-23-2008, 12:45 PM   #3
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QuoteOriginally posted by jsherman999 Quote
Wonderful work, hin.
Thanks, and here is how my adapter looks


Tamron 1.4x Pz-AF MC4 Teleconverter - Hin's Tech Corner

Tamron-F AF Tele-converter


1.4X Pz-AF MC4



I have a difficult time in understanding why Tamron stops production on this adapter while the similar Tamron 1.4x are still available for other brands.

Hin

Last edited by hinman; 07-23-2008 at 03:37 PM.
07-23-2008, 12:53 PM   #4
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I sold mine to a guy in Canada the other day on Flea-Bay, he was will to pay 500.00 for it, so they are getting hard to get.
Nice shots Hin.

07-23-2008, 01:35 PM   #5
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Nicely done.
Great use of this combo.
07-23-2008, 03:34 PM   #6
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Thank you all for the kind comments.

Few more test shots


Tamron 1.4x Pz-AF MC4 Teleconverter - Hin's Tech Corner

Riders are screaming in the shot from a far distance



Another one while dropping like free fall in the ride




Southwest @ 300/420mm with 1.4x


Sunset @ 220/308mm with 1.4x


Flickr Bigger Print Slideshow

07-23-2008, 05:49 PM   #7
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These shots look really good, but I'd be interested in seeing a comparison of the TC vs cropped 300mm. The comparison photos I've seen so far with the 55-300mm and a 100-300mm Sigma using a TC were less sharp than the lens alone (cropped to same FOV).
07-23-2008, 07:35 PM   #8
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QuoteOriginally posted by audiobomber Quote
These shots look really good, but I'd be interested in seeing a comparison of the TC vs cropped 300mm. The comparison photos I've seen so far with the 55-300mm and a 100-300mm Sigma using a TC were less sharp than the lens alone (cropped to same FOV).
A lot of discussion and information are available in this thread:

https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/19694-tamron-t...rter-pics.html

On the hummingbird shots, the TC does help me to stay farther away from the bird. With the TC, the fov make it difficult to locate the small bird in the tree branches. I used the zoom in the short end to locate the small bird first before zooming to the long end to take the shot.

More test and use will tell, the PF/CA problems with the Tamron lens is a bummer. On the roller coaster ride, I purposely go for smaller apertures as in f/5.6 and 6.3 for the faster speed to up to 1/640 to attempt to freeze the motion. And as a results, a lot of PF are seen in the contrasty areas. Though I had some success in PF correction, not all are fixable with the limited tool that I have, I need to pick up better post processing in cleaning up the PF.

Thanks,
Hin


Last edited by hinman; 07-24-2008 at 03:44 PM.
07-24-2008, 03:37 PM   #9
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Question on TC and focal length

When I use the 1.4x TC with AF.S or AF.C, I still get 300mm on my 300mm zoom. Is that normal? AF continues to work but I wonder why the exif still recalls as the original focal length. If I use the TC on a manual lens, do I add the TC multiplier to the SR focal length

Thanks,
Hin
07-25-2008, 02:42 AM   #10
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QuoteOriginally posted by hinman Quote
When I use the 1.4x TC with AF.S or AF.C, I still get 300mm on my 300mm zoom. Is that normal? AF continues to work but I wonder why the exif still recalls as the original focal length. If I use the TC on a manual lens, do I add the TC multiplier to the SR focal length

Thanks,
Hin
Nice series of shots

The camera doesn't recognise the TC so only the focal length of the lens attached is recorded - this affects the effectiveness of the IS too. The upcoming Pentax TC is rumoured to include "full functionaility" so should not have this "issue".

I must admit that after some debate & decided against buying a TC for my new DA 55-300 as I find that in anything but bright light it requires reasonably high iso, my thinking is that the - 1 stop of the TC & also the less effective IS would make it's use limited to only the best lighting ?

simon
07-25-2008, 10:25 AM   #11
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QuoteOriginally posted by simonkit Quote
Nice series of shots

The camera doesn't recognise the TC so only the focal length of the lens attached is recorded - this affects the effectiveness of the IS too. The upcoming Pentax TC is rumoured to include "full functionaility" so should not have this "issue".

I must admit that after some debate & decided against buying a TC for my new DA 55-300 as I find that in anything but bright light it requires reasonably high iso, my thinking is that the - 1 stop of the TC & also the less effective IS would make it's use limited to only the best lighting ?

simon
Thanks for the input on the focal length. I share your viewpoints on (-1) stop and less effective IS. But I still think that the Tamron 1.4x TC may add value to your DA 55-300 especially on the extended 420mm focal length for shooting small objects in far distance.

In good condition a 400mm prime will be harder to shoot birds as the fov is narrow and I would imagine a hard time to find the bird and with a heavy weight to be hand held. In a light zoom, I can zoom to the 55mm to roughly locate the bird and zoom out to the long end to get the bird closer in the shot. If AF stays on with the TC, that may add some value to the gear. But if I have the K20D, cropping may be more effective as compared to the TC.

Last edited by hinman; 07-25-2008 at 05:41 PM.
07-25-2008, 10:33 AM   #12
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Hin How is the metering?

I have had some issue on the K10 with a TC and fast lenses being 1 stop over exposed when using a TC
07-25-2008, 10:51 AM   #13
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QuoteOriginally posted by Lowell Goudge Quote
Hin How is the metering?

I have had some issue on the K10 with a TC and fast lenses being 1 stop over exposed when using a TC
Lowell, I have not used it long enough to be certain, but so far I don't see overexposure on my K10D with the Tamron 1.4x TC. And in the test shots with the roller coaster and hummingbird, I don't need to dial in Ev compensation.

Thanks,
Hin
07-25-2008, 05:35 PM   #14
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More Hummingbird shots with Tamron 1.4x TC

I came back to the same location and used Tamron 70-300 Di LD and Tamron 1.4x TC to take pictures on probably the same hummingbird. The color on background is a bit flat and not too interesting. Some are cropped. I may go with some more tuning on exposure and contrast, suggestions welcome.


#1


#2



#3


#4



#5
His/her back is most colorful with green


#6
dancing after the meal as if he/she is checking me out before leaving



Pictures from previous series seem better. Color seems a bit dull. I mostly shot these in 240mm with the 1.4x TC, some in 300mm. Mostly in f/6.3 and f/7.1 in iso 400 with my K10D to get the shutter speed above 1/640 sec. I have the AF 540 flash and I have not learned to use it for the shooting, I am not sure if the filled flash will scare away the bird in eating.

If you can share experience in shooting hummingbirds, please comment for things I can learn to do better.

Hin

Last edited by hinman; 07-28-2008 at 01:22 PM.
07-28-2008, 01:25 PM   #15
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I tried it again this morning with my Tamron 70-300 Di LD and Tamron 1.4x TC

The lighting today allow me to have a faster shutter


1/1600 sec, f/6.3, 420mm (after 1.4x), iso 400, 0 Ev, hand-held



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