Thinking about jumping ship due to poor AF. Any help?

Started Apr 28, 2014 | Discussions thread
Petroglyph Veteran Member • Posts: 5,929
Re: Thinking about jumping ship due to poor AF. Any help?

viking79 wrote:

GabrielFFontes wrote:

Hey guys!

The trade off is low light focus is worse. The system will fail earlier than SLR, and require some sort of focus assist light. Since the system requires contrast a focus assist light on the camera is terrible and provides little contrast so doesn't really speed things up. Best bet is technique to put some contrast on the subject. However, My K-5 was terrible in low light, but this should be rectified by now with K-3 or K-5II(s).

Do you guys think i would see improvement switching to a Nikon D7000?

Not necessarily. I saw improvement going from K-5 to D7000, but don't think K-5II or newer would be any worse. You will still miss shots. Most importantly you need to learn how the AF system responds. It took me a while to learn that the periphery sensors on the D7000 are horizontal edge sensitive and not vertical edge sensitive. As soon as I learned that my focus improved dramtically.

With Pentax you need to learn that the focus sensors are very large in older models and might be grabbing something you don't want them to be focusing on.

You should check out a K-3 Eric, 25 of 27 AF points are cross type and they are much smaller than earlier models.  Also the centre three points are sensitive to -3ev.  I'm surprised the new TC supposedly won't work with f/5.6 max or smaller max aperture lens (unless it is baked in the software as with Canon).

The lens is a very important aspect as well. To get great focus on the D7000 you are probably going to need a newer lens.

What about a Canon? 60d, 7d? (but i guess i would lose in image quality)

Same as D7000 I would guess.

Any help? It would be tough to get a K-3 here because it's not so easy to get Pentax items here, and by jumping ship i would be able to sell all my lenses and invest in the camera and new equipment...getting a K-3, i wouldn't want to sell lenses.


Mirrorless cameras require a different mindset, you should turn off image review since you already know what image is going to look like before taking shot (with some cameras that always show live preview by default), and the review image blocks the EVF or monitor from showing the live feed. If you do this blackout time is comparable to DSLR.

Also, it takes time to get used to differences in focus behavior. Be sure to focus on high contrast area (catchlight in hair often wants to grab focus above ears), For this reason need adjustable focus point size you can make smaller or larger depending on situation.

For action shots, you often use AF-S and press shutter fully so it snaps image almost instantly after focus is achieved. This is useful on cameras with short shutter lag and electronic first shutters. This means you can usually get first shot in focus.

Mirrorless cameras are rapidly catching up in AF-C performance. Sony A6000 seems to be leading the charge here, but your telephoto lens selection is pretty minimal (seems to be the area you would want this feature most).

Bottom line is before jumping to a mirrorless camera make sure the system offers the lenses you would want to use, and available today (or shortly). I am done with DSLRs and don't regret my decision to do so. I still am fond of Pentax, but they don't make what I want to buy today.

Mirrorless cameras aren't better or worse, they are just another tool to do the job. The bottom line is you shouldn't have to fight your tool to get the job done and so get something that works for you. If Pentax isn't working for you don't hesitate to change, but knowing more about your specific situation might help.


 Petroglyph's gear list:Petroglyph's gear list
Sony Alpha a7R II Sony FE 90mm F2.8 macro Rokinon 135mm F2.0 Samyang 20mm F1.8
Post (hide subjects) Posted by
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow