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Tamron SP 60-300mm + 1.7X TC: 510mm sample
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PostPosted: Tue Sep 07, 2010 4:27 am    Post subject: Tamron SP 60-300mm + 1.7X TC: 510mm sample Reply with quote

Took this snap earlier today with a Tamron SP 60-300 + 1.7X TC = 510mm
The sun was setting and so I had to push ISO to 640 to compensate for a rather slow shutter, so there is a little detail loss due to NR. Though overall I'd say the results look promising...

I'm going to run some more tests tomorrow in better light to see how things look then.


PS. The camera was spot focused on the grass stock rather than the subject, in case someone wondered about the DOF. All in all, I'd say not to shabbey for a $60 dollar eBay zoom lens Wink


Last edited by JohnBee on Fri Sep 10, 2010 9:17 am; edited 1 time in total


PostPosted: Tue Sep 07, 2010 5:37 pm    Post subject: Reply with quote

Thats just around the price i paid for mine ( in £GBP )

I think the IQ is damn good. What was your 1.7x TC ? I've tried the Tam SP 01F BBAR flat field 2x TC before, but i'm not 100% convinced of its quality


PostPosted: Tue Sep 07, 2010 6:49 pm    Post subject: Reply with quote

Fretless Pete wrote:
Thats just around the price i paid for mine ( in £GBP )

I think the IQ is damn good. What was your 1.7x TC ? I've tried the Tam SP 01F BBAR flat field 2x TC before, but i'm not 100% convinced of its quality


This one was taken with a Pentax SMC-AF 17x TC
I tried the same lens with other 1.4 and 1.7x TC's but this one gave the best results. Plus it makes the Tamron Auto Focusing which is somewhat convenient.


PostPosted: Tue Sep 07, 2010 7:05 pm    Post subject: Reply with quote

nice portrait, if your 1.7x TC is AF, does it mean this pic is AF
on your k20d, the 510mm are 765mm!
your daughter have good eyes if she find you at this distance


PostPosted: Tue Sep 07, 2010 7:20 pm    Post subject: Reply with quote

What distance between you and the girl?


PostPosted: Tue Sep 07, 2010 11:03 pm    Post subject: Reply with quote

Quite a nice result ! wide open !?


PostPosted: Wed Sep 08, 2010 7:51 am    Post subject: Reply with quote

poilu wrote:
nice portrait, if your 1.7x TC is AF, does it mean this pic is AF
on your k20d, the 510mm are 765mm!
your daughter have good eyes if she find you at this distance


The combination could be used in AF, but since my adaptall adapter is not A(PK/A), it is manual aperture and so I am limited to MF.

Himself wrote:
What distance between you and the girl?

Aprox. 100 feet

Phenix jc wrote:
Quite a nice result ! wide open !?

I believe this was f/5.6, and the lens is 3.8 if I'm not mistaken.


Last edited by JohnBee on Wed Sep 08, 2010 9:13 am; edited 1 time in total


PostPosted: Wed Sep 08, 2010 8:39 am    Post subject: Reply with quote

What camera was it taken with...I like it. Very Happy


PostPosted: Wed Sep 08, 2010 9:13 am    Post subject: Reply with quote

mo wrote:
What camera was it taken with...I like it. Very Happy

K20D


PostPosted: Wed Sep 08, 2010 9:21 am    Post subject: Reply with quote

JohnBee wrote:
poilu wrote:
nice portrait, if your 1.7x TC is AF, does it mean this pic is AF
on your k20d, the 510mm are 765mm!
your daughter have good eyes if she find you at this distance


The combination could be used in AF, but since my adaptall adapter is not A(PK/A), it is manual aperture and so I am limited to MF. ]


This is not the limitation with this AF-teleconverter, it focuses just fine with all manual lenses, which are bright enough (users report it to work up to F4.5-F5.6 depending on the light available). So it should focus just fine even without the PKA-adapter, in this case the lens is just too dark at least in the long end (F5.4).


JohnBee wrote:
Phenix jc wrote:
Quite a nice result ! wide open !?

I believe this was f/5.6, and the lens is 3.8 if I'm not mistaken.


The lens is F3.8-F5.4.
http://www.adaptall-2.org/lenses/23A.html


PostPosted: Wed Sep 08, 2010 9:51 am    Post subject: Reply with quote

soikka wrote:
This is not the limitation with this AF-teleconverter, it focuses just fine with all manual lenses, which are bright enough (users report it to work up to F4.5-F5.6 depending on the light available). So it should focus just fine even without the PKA-adapter, in this case the lens is just too dark at least in the long end (F5.4).


Indeed.

If I had a PK/A adaptall mount, I could shoot without stopping down and it would most likely work all the way to full extension. However, my own experiences have shown that at/or around 5.6, AF is really borderline in terms of usefulness. At which point it really only works reliably in very good light.

But with my particular PK adaptall adapter, I am at the mercy of two forces that work against this TC being AF. The first is where the adfaptall mount(flange surface) is powder coated. Which prevents the contact pins from being shorted out this stopping AF, The other issue is where I must stop down manually with this lens, therefore... the TC AF function is not an option with this particular combination.

I also know I could short the pins on my camera using tin foil(or equivalent) but I'm just not big on rickety modding when it camera hacks. But given these results, I think this lens warrants picking-up a PK/A adapter off eBay or similar.


PostPosted: Wed Sep 08, 2010 5:55 pm    Post subject: Reply with quote

soikka wrote:

The lens is F3.8-F5.4.
http://www.adaptall-2.org/lenses/23A.html

Very Happy THANK YOU for the new Adaptall's link(s) !
All the old links were hi-jacked ; I went on web.archive.org
but the pictures were lost (and I didn't find anything on google then Rolling Eyes )


PostPosted: Wed Sep 08, 2010 6:40 pm    Post subject: Reply with quote

Phenix jc wrote:
soikka wrote:

The lens is F3.8-F5.4.
http://www.adaptall-2.org/lenses/23A.html

Very Happy THANK YOU for the new Adaptall's link(s) !
All the old links were hi-jacked ; I went on web.archive.org
but the pictures were lost (and I didn't find anything on google then Rolling Eyes )


Thank Attila. He's behind it all. Copied the site to a new server after the old one was lost.


PostPosted: Wed Sep 08, 2010 7:07 pm    Post subject: Reply with quote

Well, Yes indeed ! (Much more living than web.archive.org which is a Great resource anyway)


PostPosted: Thu Sep 09, 2010 11:00 pm    Post subject: Reply with quote

I really like this lens. Using it on a Contax is very easy especially as it is surprisingly light given its focal length.

I've also used it on my Olympus E-3 with a 4/3-Adaptall 2 adapter and am awaiting a M4/3 adapter so that I can pop it onto an E-PL1. Having in effect a 120-600 zoom is very useful.

It is sharp, offers good contrast and distortion is well-handled for such a zoom length. And current ebay prices represent a bargain for such a good quality lens.


PostPosted: Thu Sep 09, 2010 11:13 pm    Post subject: Reply with quote

A 60-300mm lens is still a 60-300mm lens no matter what you mount it on.

The FOV gets cropped, and by how much depends on your crop factor, but thats it. There's nothing that i know of that magically increases focal length of a lens when its mounted on crop cameras


PostPosted: Fri Sep 10, 2010 8:00 am    Post subject: Reply with quote

Fretless Pete wrote:
A 60-300mm lens is still a 60-300mm lens no matter what you mount it on.


Try taking a look at this link to find more info: http://www.lonestardigital.com/multipler.htm


PostPosted: Fri Sep 10, 2010 8:31 am    Post subject: Reply with quote

Thats a good link , and explains my statement well. Its only perceived as extra FL , but in reality, a myth.

There's some good reading on the myth..

http://www.digitalcamerareview.com/default.asp?newsID=3611

http://www.luminous-landscape.com/tutorials/understanding-series/dslr-mag.shtml

http://www.clarkvision.com/photoinfo/cropfactor/

http://www.bobatkins.com/photography/tutorials/crop_sensor_cameras_and_lenses.html

http://www.the-digital-picture.com/Canon-Lenses/Field-of-View-Crop-Factor.aspx