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06-16-2010, 03:54 PM   #1
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To sell my DA-40mm for a zoom or not...

i've been using prime lenses for a while now but there are times, such as when i am on vacation or when my sister asks me to take photos of her little kids, when i just think that a versatile zoom would be great to have.

i have an old 18-55mm that came with my old k100d kit but i have no desire to use it. yes, i know it's not the equipment that makes a photographer but i enjoy picking up my camera with a nice lens attached more than i would if i used the kit lens. since photography is just a hobby this feeling is important to me.

so what i am thinking is that i can part with my terrific copy of the gem that is the da-40mm and get a 17-70mm lens which will give me the focal coverage i want and convenience of a zoom without too big of a hit in the wallet. i will also keep my 50mm f1.7 for low light conditions.

so logically i think this plan makes sense. however, i have a feeling that i will regret the decision after all is said and done. what do you folks think?

06-16-2010, 04:05 PM   #2
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i vote for not selling the DA 40mm, which is by far the most underrated lens in the DA limited lineup.

Instead of getting a 17-70mm, save a couple hundred and get a 16-45. You can find one in the forum for about 250ish and it absolutely improve upon the 18-55 kit lens in every level.
06-16-2010, 04:24 PM   #3
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the problem i have with the 16-45, and 16-50 for that matter, is the focal lenth range.

i prefer the wide end so i don't see much appeal in a supersoom, especially with their variable aperture. however i do want something longer than 45 or 50mm and the 17-70mm is the only AF lens i know of which gives me wide angle and still goes past 50mm while offering a constant f4 (or f2.8-4/4.5 for the sigma lenses).
06-16-2010, 04:53 PM   #4
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I chuckle because in my mind, vacations and "keeper" photos are when you break out the 40mm instead of putting it away.
The 40 is great for vacations because it is so tiny that you always bring it along.
The 40 is great for "keepers" of kids because it is sharp as a razor, focuses as fast as any Pentax lens, and is faster than most zooms at f2.8.

06-16-2010, 05:04 PM   #5
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If you won't miss it, sell it.
06-16-2010, 05:06 PM   #6
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There are so many good manual zooms on ebay... For instance, a while ago I bough a Vivitar 28-70mm 3.5-5.6. Surprisingly good. (Good mtf grade on photodo; 3.2 if I remember correctly.) Much, much better than the kit lens, and the very nice wide open--although, of course, slow. But for less than $50 you can buy a temporary solution, until you have enough capital to get a zoom without sacrificing the da 40mm.
06-16-2010, 05:53 PM   #7
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QuoteOriginally posted by pb_red Quote
so what i am thinking is that i can part with my terrific copy of the gem that is the da-40mm and get a 17-70mm lens which will give me the focal coverage i want and convenience of a zoom without too big of a hit in the wallet. i will also keep my 50mm f1.7 for low light conditions.

so logically i think this plan makes sense. however, i have a feeling that i will regret the decision after all is said and done. what do you folks think?
If it were me, I'd regret it the moment I clicked the "OK" button on the sale. I'd chuck the 50 long before I'd part with the 40. Get an old $20 manual 50 if you must have something faster than the 40, but the 17-70 and a 40 to me makes a far better pair than the 17-70 and a 50, for all the same reasons I use my 40 about 1000 times more than I use my 50 (eg, more generally useful focal length, smaller size, faster focus)
06-16-2010, 05:56 PM   #8
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I would not part with my 40ltd for a zoom. Causey's idea of getting a more inexpensive zoom seems a good idea. I picked up a M 75-150mm I really like for 75.00. Manual focus and exposure of course but there others out there that might fit you need with out having to get rid of your 40.

06-16-2010, 08:10 PM   #9
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QuoteOriginally posted by pb_red Quote
the problem i have with the 16-45, and 16-50 for that matter, is the focal lenth range.

i prefer the wide end so i don't see much appeal in a supersoom, especially with their variable aperture. however i do want something longer than 45 or 50mm and the 17-70mm is the only AF lens i know of which gives me wide angle and still goes past 50mm while offering a constant f4 (or f2.8-4/4.5 for the sigma lenses).
I have both the 17-70 and the DA40, and both have their place.

The DA40 is a terrific lens. You will miss it. Get the zoom for times you need the wide and zoom and can't change, and keep the 40. I use the DA40 constantly as a travel lens. The DA40 plus DA21 makes a light, pocketable and sharp combo on the K-x that fits in a large pocket or waist pack. I use it constantly.
06-16-2010, 08:25 PM   #10
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I say go with your gut and dump the 40. It isn't so rare that you won't be able to replace it at a later date. It might Cost you more but if it's a bag queen, let it go to someone who will use it. Then get what you want. I will add that there is no shame in having multiple coverage in a given focal range. However, lenses that never get put on the camera never take pictures, no matter how nice they are.

06-16-2010, 08:52 PM   #11
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Sell it. If the 50mm 1.7 was manual focus I might think differently, but from what I understand the F 50mm 1.7 is supposed to be a great lens.

If you think a zoom will get you shots that you don't get now, then by all means, do what you can to get it.
06-16-2010, 10:38 PM   #12
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Keep it, but get a zoom.

As I said once before, primes are when you are shooting alone; zooms are when you are travelling with someone else and want to be still on speaking terms at dinner.

For me the Sigma 17-70, Pentax FA24-90 or the lowly 18-55 kit lens are ideal when you with other people.

Left to myself I carry the DA pancakes - 15, 21, 40, 70, sometimes just one or two of them. (Although the wide-open usefulness of the M50 sometimes edges out the 40.)
06-17-2010, 02:38 AM   #13
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The only lens I wold trade for DA40 is FA43. I actually did this...
I would never get zoom instead any of those two!
06-17-2010, 05:06 AM   #14
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I'd say keep the prime you use the most (40 or 50) and sell the other one. Either will fetch a decent price. Then get the zoom, having a good zoom is a great thing for exactly the situations you describe.

I'd look at the

Pentax 17-70
Sigma 17-70 (I own it and love it)
Tamron 28-75 f2,8

These are the three that would fit your requirements, I think. They are all excellent optically, none is too expensive, all will serve you well.
06-17-2010, 12:05 PM   #15
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thanks for the input everyone!

i need a low-light lens and since, unlike CaNikoNy, pentax refuses to make a cheap f1.8 lens i need to keep the 50mm f1.7 for those rare occasions.

also, AF on the K7 rocks (at least compared to my old k100d) and while i have a couple of old MF lenses i don't really use them. i can't imagine this changing even if i got very nice MF lenses so the MF option is out.

so for now the plan is to get a 17-70mm, keep the DA-40mm for a couple of months, and if i don't use it then i'll sell and recoup some of the cost of the zoom.
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