[Kunzite]

Hard to compare otherwise as few copies of G1 are still available. The G2 isn't that much better than the G1 anyway -- biggest improvement is in VC performance, which Pentax didn't include anyway.

If I'm not mistaken, the optics are identical.

[Serkevan]

Yes, but I think you are referring to the newer Tamron G2 version from 2017 which outperforms the 2013 one Pentax is based on :/

Isn't the optical formula identical in both versions? Do we have a shootout between both of them and compared with the Pentax? I wouldn't be surprised if the iteration went Tamron 2013 -> Pentax 2015 -> Tamron G2 2017.

[thibs]

This would be neat for us, but considering the DFA 150-450 is not a star lens - although the argument can be made that it performs like one - I can't imagine Pentax would be interested in the Tamron 100-400. Similar reasoning for us not getting a version of the 150-600.

From what I've seen, the Tamron 150-600 is not better than the DFA 150-450 + 1.4x TC, although obviously the Tammy is more economical.

The 150-450 is no * 'cos it has variable aperture (whatever its optical properties are).

[sundown]

Isn't the optical formula identical in both versions? Do we have a shootout between both of them and compared with the Pentax? I wouldn't be surprised if the iteration went Tamron 2013 -> Pentax 2015 -> Tamron G2 2017.

https://dustinabbott.net/2017/10/tamron-sp-24-70mm-f2-8-di-vc-usd-g2-review/ Somehow the newer version is sharper edge-to-edge even with the older optical formula.

[Serkevan]

Tamron SP 24-70mm f/2.8 Di VC USD G2 Review - DustinAbbott.net Somehow the newer version is sharper edge-to-edge even with the older optical formula.

With a bit of luck, that happens with the D FA 70-210/4 too!

[thibs]

We can deduce it by reverse engineering, as Tamron and Sigma do for their lenses
I think the main advantage of the Tamron re-branded Pentax lenses is that the communication protocol with the camera is the original one and not one deduced by reverse engineering plus plus the Pentax specific WR construction.

Ricoh could have stayed with the original lens stabilization and they implemented a dual IBIS + lens stabilization system.

Tamron does no reverse engineering. And if they did, Ricoh would not use their stuff.

[Mistral75]

If I'm not mistaken, the optics are identical.

Yes they are. The differences between G1 and G2 are:

• Coatings - no impact on the Pentax version
• Two processors (one dedicated to autofocus and the other one to stabilisation) instead of one - no impact on the Pentax version
• Compatibility with the TAP-in console - no impact on the Pentax version
• Better construction - but the Pentax version is said to have been improved in comparison to the G1

[thibs]

like some others i miss from pentax dfa 150-600mm. I don’t mind if it is tamron rebadge or not. Despite dozens of pentax lenses and pentax bodies like k3, k1 and 645z, i had to to buy a few weeks ago nikon d500 and sigma 150-600mm for bird and wild photography. Pentax dfa 150-450 is a good quality lens but too short telephoto lens for me and pentax da 560mm f5.6 is a bit overpriced in my opinion.

As for the new pentax 70-210mm f4 lens, i believe it will become a popular lens for travel photography as a lightweight, high quality lens. It will be a good pair of the dfa 28-105mm and it looks great .i will buy it as soon as the lens price drops to about a thousand euros.

150-450 + tc ?

[thibs]

According to DPR's "I own it" tag, which isn't anywhere near an accurate representation of sales, we have:
- HD PENTAX-D FA 28-105mm F3.5-5.6 ED DC WR: 103
- HD Pentax D FA 24-70mm F2.8 ED SDM WR: 89
- Pentax D FA 150-450mm F4.5-5.6 ED DC AW: 63
- HD PENTAX-D FA 15-30mm F2.8 ED SDM WR: 63
- Pentax D FA* 70-200mm F2.8ED DC AW: 47
- HD Pentax-D FA* 50mm F1.4 SDM AW: 43

My impression was that the D FA 150-450 is more popular than its price and size would suggest, as it's also a good match for an APS-C camera (and pretty much the only good option as a long telephoto).

This tag is useless IMO

[TwoUptons]

This tag is useless IMO

It’s not useless. When half the people commenting on a newly announced product click that they own it, you know the comments are all completely fictional

-Eric

[edri]

Tamron does no reverse engineering. And if they did, Ricoh would not use their stuff.

Tamron does reverse engineering for the other mounts, not the K-mount. That's what I said.

[MMVIII]

Tamron SP 24-70mm f/2.8 Di VC USD G2 Review - DustinAbbott.net Somehow the newer version is sharper edge-to-edge even with the older optical formula.

Because they put the coatings and fine-tuning of the Pentax now also in their own v2.

[Serkevan]

Because they put the coatings and fine-tuning of the Pentax now also in their own v2.

That's what I was thinking - they apparently increased the quality of the aspherical elements, which could be the reason the Pentax 70-210 shows extra marketting fluff on those. Let's see how it tests in the end.

[beholder3]

150-450 + tc ?

On a German Forum a user once did a comparison shootout between the Sigma 150-600 and the Pentax 150-450 + DA TC. The Sigma lost in the image quality department against the combo. And the user is very Sigma friendly in general.
The Tamron 150-600 consumer long telezooms are generally believed to be somewhat weaker than the Sigmas, at least not better.

---------- Post added 22nd Jan 2020 at 14:23 ----------

Tamron SP 24-70mm f/2.8 Di VC USD G2 Review - DustinAbbott.net Somehow the newer version is sharper edge-to-edge even with the older optical formula.

Since the G2 is just a tiny cosmetic facelift over the G1 version, any optical improvement (coatings effects aside) is not down to the model but consequence of random sample variation.

[WorksAsIntended]

Tamron SP 24-70mm f/2.8 Di VC USD G2 Review - DustinAbbott.net Somehow the newer version is sharper edge-to-edge even with the older optical formula.

May very well just be varaiability in production causing these results. Or maybe they just enhanced production over time. I do not expect Pentax to sell their coating to Tamron without any notice.