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Forum: Pentax SLR Lens Discussion
05-26-2018, 11:32 AM
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No problem. The biggest benefit to Pentax is being to able to use whatever lens on whatever camera you want. It gives you the freedom no other system can offer. I have always maintained that the right lens and camera are the ones that work for you. That is the whole beauty behind the SLR system. That and LBA and my empty wallet.
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Forum: Pentax SLR Lens Discussion
05-26-2018, 09:53 AM
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There is no ASP-C equivalent of the DFA100 macro or the DFA 150-450. There are many ASP-C alternatives for the DFA 24-70. I do not personally feel the DFA24-70 is that much optically better. There is also a big difference in size and weight between a 82mm and a 77mm lens. That was my point on the DFA 24-70 being overkill in both price and size. The equivalent 36mm to 105mm field of view may prove to be quite frustrating indoors. Back when I was shooting my Super Program I had a 35mm to 70mm zoom. I was always backing into walls trying to get more coverage. Then I managed to get an A 24-50 and my world changed. That extra field of view makes a huge difference. I too use my full frame lenses on my K3. For macro and wildlife, the crop sensor camera is still the best choice in my opinion. It simply gives you the best bang for your dollar. Personally I have never mounted my Sigma 50-500 on my K-1. Even on the K3 I am always needing more reach it seems.
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Forum: Pentax SLR Lens Discussion
05-25-2018, 03:00 PM
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 Quote: The DFA24-70 is a full frame lens. You are paying a lot more money for a lens that covers a 24X36mm sensor. A crop sensor lens is much more affordable and more compact. Right a Sigma 17-50 is about $369 and the DFA24-70 is over a $1000. Also 24mm on a crop sensor camera is way too narrow for a lot of shots. SDM is the Pentax trademark name for their Supersonic Drive Motors that in their high end lens. All DA* lenses feature these in lens motors rather traditional screwdrive. Some feature both. In lens motors are virtually silent making them very appealing for indoor work.
I own both the DA18-135 and the HD16-85. One thing everyone needs to do with all UWA (Ultra Wide Angle) lenses is test for decentering and for if any focus adjustment is needed. It sounds like your 16-85 may have been decentered. I have seen a few of them. This can happen with any lens. Keep in mind all the new DFA lenses use the HD coatings. I went through 3 Sigma 8-16's and 2 Tamron 70-200's before I had a good one of each. The 18-135 is still my goto lens if I can only take one lens. For all of its weaknesses it is still one of the best all around lenses for Pentax. The DFA28-105 is sharper overall but does cover the equivalent focal range of 28-200mm on full frame. I however would want to rely on the 18-135 for indoor photography unless I was using a flash.
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Forum: Pentax SLR Lens Discussion
05-24-2018, 04:30 PM
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You keep mentioning your low light needs. The DFA 24-70 is simply overkill for your K3. In low light situations I simply can not overstate the importance of a fast constant apeture lens. Essentially you have the Pentax DA*16-50, Tamron 17-50, and the Sigma 17-50. These are all f2.8 constant aperture zooms. I own the DA*16-50 and it was my most used lens on my cameras. Unfortunately I dropped my 16-50 which left it badly decentered. This was no fault of the lens. Now I use the Pentax 16-85 which is just a fantastic lens. I also had the Sigma 17-50 as well but preferred the color rendering and contrast of the 16-50. This was merely a personal decision and is nothing against the Sigma. There is a very good review of these three lenses here. DA* 16-50mm vs. Sigma and Tamron 17-50mm F2.8 Comparison Review - Introduction | PentaxForums.com Reviews
Personally I feel the winner of the three is the Sigma. The Sigma is well built, has reliable silent focus, is usable wide open, and is extremely affordable even new. I never purchased the 17-70 due to the autofocus issues. As for the Superzooms, 18-300, I do not feel you will get the image quality out of them ypu want. Plus they are extremely slow. A very good setup would be the DA*16-50, or one of the 17-50's and the DA*50-135.
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