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08-22-2008, 02:51 PM   #421
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That goose looks pretty good, Daniel.

Have you used the TC with the A* to get a 450mm f/5.6?

08-22-2008, 10:40 PM   #422
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OK - I'm one of those who has paid a bit for a Tamron TC 1.4 - from one on this thread... Just waiting for it to arrive, then I'll try it on the back of some of my lenses.

One that I'm interested in trying it on is my Tamron 18-250 which I use as a walkabout lens when I only want to take one lens. Having the TC with me will just extend the range enough.

Went whale-watching last week, with the K20D and the Tammy 18-250 only, and got some nice shots. Those humpbacks got up REAL close to the stern of the boat, but if I'd had the TC with me, I could have got better shots of the whales when they were just that bit further away frolicking.

I shot in RAW, and on auto-drive, popping off 3 - 5 shots at a time, in shutter priority mode, all at about 1/320.

You can see from the third shot that just a bit of extra reach - say about 1.4x - would have given me a nicer shot without having to crop.

All shots taken DNG, saved as JPG in Picasa, uncropped, then scaled down to 1280x1024 in Irfanview
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08-22-2008, 11:49 PM   #423
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Looks great Pete as Ive giving up shooting the whales as I've missed them everytime Im looking for them LOL


Good to see that you've collared a Tc at last

To everyone else the TC is worked out by lens X tc= mm or/// is it Lens X TC X crop factor= mm
I like the idea of a 55-300 X TC X crop factor 1.5= 116-630mm

cheers

Last edited by cupic; 08-23-2008 at 03:33 AM.
08-24-2008, 06:48 PM   #424
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Pete, nice whale shots; they wouldn't have been any better with the TC ;-)

Cupic, the TC multiplies the focal length of the lens by 1.4, that's it. At the long end, you're DA 55-300mm will be 420mm. Sure, if you want, you can say that on your K10D the FoV you would get is equal to 630mm on 35mm film, but that's just the equivalent FoV, not the magnification.

08-24-2008, 07:01 PM   #425
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Here are a couple of shots with the Tamron 1.4x. First, connected to the Sigma 70-300mm APO (I call this my Javier Special). It has only been minimally cropped, mostly because I had to straighten it a little bit. Hand-held, by the way.


Please Recharge after Using

This next one was taken with the TC attached to a Sigma CAT 400mm f/5.6, providing a 560mm f/8 equivalent. I shot it on a tripod and it was tough to focus, but I'm quite pleased. I think with a bit more practice and the Moon higher in the sky I could get a very decent shot.

08-24-2008, 07:34 PM   #426
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Mis, Those are some fine moon shots.
08-24-2008, 07:47 PM   #427
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Here are a few taken with the K10D and Sigma 135-400 and Tamron 1.4TC-mc4 ...

Exif data should be intact.
All images are resized only. No cropping, no PP, at all..This is how they came out of the box.

I spotted this beauty from a distance.


So I started to walk in her direction...


Then she turned around and I took another quick grab shot...


After getting chased away by the ''PRO'' shutterbugs, I made my way around to a distant pier AND the hunt was on and so I shot her again...


Busted, but she approved and kept smiling for me as I kept shooting....
08-24-2008, 07:53 PM   #428
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One more with a tight crop.


08-24-2008, 08:05 PM   #429
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Ha ha ha, that's a great series, Javier! Did the pro photogs really chase you away? Very nice last shot, but shame about all those pigeons!

And I should have mentioned that the second Moon shot was cropped. I took it in landscape and then cropped to portrait, further losing some frame off the top and bottom. So let's call it a 50% crop
08-24-2008, 08:24 PM   #430
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Mis, Those are not pigeons, but flying rats...

The Pro's really did chase me away...In fact, they got down right rude and upset and threatened to sue me...I said go right ahead....

Here is another one. This one was a tough shot. Shooting at very long range and shooting from the sunlight into to the shadows...
08-24-2008, 08:32 PM   #431
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QuoteOriginally posted by jgredline Quote
The Pro's really did chase me away...In fact, they got down right rude and upset and threatened to sue me...I said go right ahead....
They were probably just jealous that your lens was bigger than theirs
08-24-2008, 08:40 PM   #432
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QuoteOriginally posted by Miserere Quote
They were probably just jealous that your lens was bigger than theirs
Thats funny because thats what my Son said...
08-25-2008, 02:53 AM   #433
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Nice ones Javier

But let's not start the "My lens is bigger than your lens" thingy - we could generate a whole new line in spam.....

Re my whale shots above - that last one of the whale's tail - that was at full stretch on the 18-250, and I just wish I'd had the TC on to frame it better.

Any of you experts think that the definition and resolution would be better or worse by:

(a) tighter framing with a 1.4x TC, with the slight optical degradation of the TC (maybe)

or

(b) using the shot as taken, then crop and enlarge.

Which would give the better photo - theoretically?
08-25-2008, 04:06 AM   #434
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QuoteOriginally posted by Derridale Quote
(a) tighter framing with a 1.4x TC, with the slight optical degradation of the TC (maybe)
(b) using the shot as taken, then crop and enlarge.
Which would give the better photo - theoretically?
May I answer?

With a 18-250, which doesn't have the ultimate (read: sub pixel) resolution, there would be no difference between the two, with a little bit of extra chromatic aberration for the TC image.

A TC on a K20D needs a lens with a resolution in excess of 150 lp/mm. Which in turn needs an aperture of f/8 or wider. So, the lens should have a better resolution at f/5.6 than at f/8. Tele primes do. The Pentax 18-250 does at 18mm only, i.e., it doesn't at 250mm [Pentax SMC DA 18-250mm f/3.5-6.3 ED AL [IF] - Lab Test Report / Review].

To summarize:
Prime + TC: yes
Zoom + TC: no
08-25-2008, 07:08 AM   #435
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Tamron Turtle

Nice shots Pete! No whales here but here's a Box Turtle crossing the road this am. K100, Tamron 1.4, Tamron 18-250; full zoom, unedited............
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