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Forum: Pentax SLR Lens Discussion 10-24-2016, 06:42 AM  
Stacking HD 1.4 TC on a Tamron 70-200 f2.8 or the 1000€ Question
Posted By normhead
Replies: 15
Views: 2,130
My answer is explained in detail here.
https://www.pentaxforums.com/forums/10-pentax-slr-lens-discussion/318152-answ...acked-tcs.html

But I have to say, this is not a cheap solution, this is a light weight solution as as such is somewhat more expensive than some of the zoom solutions. Personally I Love my 60-250, but I don't consider it to be a telephoto. At 10 feet it's only the equivalent of about 135mm, not getting to 250mm until it approaches infinity. I bought the F 1.7x AF Adapter one year, the HD DA 1.4 TC a few years later, and DA* 200 a few years later, so I never really suffered sticker shock. Buying them all at once, you might as well just spring for a 150-450 or 50-500, unless like me you're concerned about weight.

So just from my experience.

You can't get reasonable performance with stacked TCs without an ƒ2.8 lens. You can stack on an ƒ4 lens, but you'll be doing some futzing with the focus.
I hate carrying my DA* 60-250 because of the weight. The 70-200s and 150-450 are both quite a bit heavier.

Most of the guys I know using 70-200s are using Canons and using a 2x converter. I personally would not recommend any 70-200 ƒ2.8 type lens without planning to go to a 2x as a companion. That would give you 400 ƒ5.6, with AF, not too shabby. The DA*60-250 is not all that long, even with a 1.4 TC. I find it useful as a telephoto, only with the 1.7x on it, and then you have to fiddle with partial AF. That being said, the Sigma 150-500 or 50-500 are by far the most popular "I want to mess around with long lenses" option. Too heavy and clunky for my liking. But lots of forum members are happy with theirs.
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