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Forum: Pentax K-5 & K-5 II 06-30-2015, 11:58 AM  
The right lens...
Posted By normhead
Replies: 23
Views: 2,985
My DA*60-250 compares favourably with any prime out there for the focal lengths it covers, not just the garden variety. Me thinks thou dost generalize to the level of blatant inaccuracy. I suspect the DA*50-135 also exceeds many primes in it's focal range. Sometimes you give up flexibility, for the mistaken belief that you're getting a better image using a prime, and all you're doing is deluding yourself. Even the much maligned DA 18-135 probably out performs the FA 20 and it certainly out performs the FA* 24 ƒ2 everywhere but possibly ƒ5.6 in the centre. You should maybe look at the actual test results and images.. I think you'll be surprised. Primes definitely do not guarantee you any kind of result. You have to check the zooms available in their range and look at each one individually. The zoom is nearly as likely to be the better performer as the prime.
Forum: Pentax K-5 & K-5 II 06-26-2015, 08:26 AM  
The right lens...
Posted By normhead
Replies: 23
Views: 2,985
Those type zooms never have the IQ. To me the 18-135 still gives you prime type IQ and zoom like flexibility. If you want better IQ you can go to something like the 16-85 or a 17-70 that has a lower zoom ratio. All the top quality zooms are maximum 4:1 (DA* 60-250) and frequently 2:1 (Sigma 18-35). Once you go over the 18-135's 7.5:1, to something like an 18-300 (17:1) you won't get the IQ anywhere in it's zoom range. Even an 18-200 suffers from this.

I'm going to say this is theoretically a general rule, because I don't know every lens.... and then I'm going to say it's practically a hard rule, because I don't know of a single lens that breaks the "higher zoom ratio = lower IQ" assumption.
Forum: Pentax K-5 & K-5 II 06-22-2015, 10:21 AM  
The right lens...
Posted By normhead
Replies: 23
Views: 2,985
My current preference wold be SImga 8-16/ Pentax 10-17- DA 18-135, D FA 150-450 and the rest primes for special occasions. I want my primes fast and sharp. Currently I have the 21 ltd. DA 35, 40XS, FA 50, Sigma 70 and Tamron 90, and I'd like to add the 31 ltd, 15 ltd and 77 ltd.

So. from my perspective, from where you are, my next choice would be the 18-135. It would fill the biggest gaps in your line up. the 55-300 has only a little more than 2x as much range.

Starting from 8.. there are 8-16, 16-31, 31-50, 50-70, 70-100, 100-150, 150-200, 200-300, 300-500. 9 gaps you practically want to fill. The 18-135 covers 5 of them. At least that's the way I'd look at it. The 55-300 covers 4. It would be my next choice. After that, unless you want to go UWA as well, I'd be looking at the 15, 21 ltd, your 35, a 50, a 70 and a 90 to 135 with one of the longer primes a macro. If you have a 55-300 I'd consider either the or both of the DA 200 or DA 300 as well.

There, your whole life is planned for you. Start with the 18-135. If you're lucky, you'll be able to stop there.
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