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12-25-2015, 04:53 AM   #1
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Replace 16-50 AND 28-75 with new 24-70 good idea?

Currently, there's a good offer from a German Pentax Dealer for the new 24-70mm Pentax lens (

I intend to buy the new Pentax FF this year, however, since there are no hard facts about its pricing and its technical specs available yet, it's just an intention, no real firm plan.

I'm trying to get my lenses ready for FF. I'm almost done. Latest newcomer was a Tamron 700-200mm 2.8 which is here to replace my 50-135mm 2.8.

The only lens which still hasn't found a replacement in my lineup is the 16-50mm Pentax. I have to say that it's a very good copy, sharp right from the beginning (f2.8). Moreover, I've had its AF changed so no real risk for SDM-failure anymore. I've been using this lens really often. Besides, I also own a Tamron 28-75mm 2.8 which delivers stunning results. I picked it from three different copies. It has proven to be not that easy to find a copy that performs that excellent as my copy does.

However, the 16-50mm won't work on a FF (at least not in FF-mode... I don't want to use it in crop mode...) and the 28-75mm is to long at the beginning. That's why I will buy the 24-70mm sooner or later.
What's breaking the deal so far: I have to sell my two lenses (16-50mm; 28-75mm) in oder to refinance the 24-70.

May anyone's in the same boat and has to sell e.g. the 16-50mm for the 24-70? Do you have any regrets? Will the 24-70mm be a worthy replacement for the Tamron 28-75 (which got a very decent Bokeh => I've read some rather negative comments on the Bokeh of the new Tamron/Pentax 24-70...).

There are two scenarios I'm most afraid of:

Pentax releases its new FF-Camera and for whatever reason, it's not fitting my demands (too expensive, too big, too whatever). This would mean I have to find a comparable 16-50mm and 28-75mm again, which seems to be a tough endeavor...

The new 24-70 does perform not as good as expected (in comparison to the 16-50mm and 28-75mm) so again, I'd have to give it back and I might regret having sold good working copies for it).

Sounds quite like a dilemma I'm in .

So is there anyone who's plagued by similar fears? Any reasonable way out?

12-25-2015, 06:46 AM   #2
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Or you could keep the 28-75 and pick up a Rokinon 14mm f/2.8. That's the cheap way, but I probably wouldn't recommend it.

I don't think the Pentax 24-70 will go up in price, I'd wait until the FF is released to buy it.

Another idea - keep the 28-75, and then buy the rebadged Tamron 15-30 when Pentax releases it. Whatever you do, the Tamron 24-70 is likely going to be sharper than your 28-75
12-25-2015, 08:09 AM   #3
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Thanks for sharing your supplier, could come in handy, since I live in the Netherlands. Some (other brand) users have stated that the 28-75 performs better on APS-C than on FF. Having a copy, I'm anxiously waiting to find out myself. Cheers, Ron
12-25-2015, 09:55 AM   #4
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Personally I think you are getting ahead of yourself. If you have good copies of lenses for your current setup why jump until you see what the FF turns out to be?
Lots of things could happen:
1) The FF is delayed again
2) The FF is canceled
3) The FF does not live up to expectations
4) The FF has teething problems and bugs
5) The FF releases on time and is amazing

Only one of those means you should be an early adopter, that's 20% odds.............

And just because there is a current deal on the 24-70 does not mean it will not be repeated. It is possible there will be bundle pricing at the FF release or the 24-70 pricing will continue to go down. So personally I would wait until you know for sure.

If you could swing swapping the 28-75 for the 24-70 and keeping the 16-50 for now, that might be a good move. But if you let go of the 16-50 and end up not getting the FF at all or having to wait because of delays that would turn out into a bad move. YMMV

12-27-2015, 01:48 PM   #5
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Thank you all very much for your elaborated comments! You've convinced me that waiting in this case is definitely the best option! I'd unnecessarily give away one (or even two) very good copies without being 100% sure that the new FF-Pentax will be what I've been waiting for all these months.
One thing hasn't even come to my mind yet: what if the FF is delayed again? This will end up in a lot of frustration! Having sold well performing glass without getting anything in return... not a good idea.

Even though the 24-70 is 100 Euro off now, I'm pretty confident now that we will see such a offer again someday. But even for the case that this won't happen any time soon, it's probably better to spend 100 Euro more for something that you know than investing in a bubble .

So thank you very much for keeping me on track! My lens lineup is more or less ready for FF:

Tonika 17mm 3.5
Pentax 31 Limited
Pentax 43 Limited
Pentax 77 Limited
Pentax M 50 1.7
Pentax M 100 2.8
Pentax F135 2.8
Tamron 28-75
Tamron 70-200

I'm just missing a standard zoom for FF that offers a good wide-angle corresponding to the 16-50mm APS-C lens I've been using for years now.

I've already sold my 15mm Limited since I cannot really gain profit from it on FF. I still have the 16-50mm Pentax and the 50-135mm which will go on sale then too if this proves necessary.

So thank you very much again for your support! I highly appreciate it!
12-27-2015, 02:13 PM   #6
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You could also keep the 28-75 and pick up an FA 20-35.

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