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06-10-2019, 07:51 AM   #1
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Lens Decision for new K1

Hey,

i recently bought my first Pentax (K1) together with an old prime lens (M 50mm 1.7).
Now i want to get my first „new“ lens for the K1, but the decision is sort of hard for me...
Either the Sigma 35mm Art 1.4 or the DFA 28-105mm. According to the reviews both should be really fine lenses.
At the moment the primary uses would be Nature, Landscape, travel, Astro(never tried seriously) and maybe some portrait at festivities. The DFA seems to offer very much flexibility for a great price, but lacks a bit of aperture... the Sigma on the other hand should be very crispy, full of light but has the limitation of a prime lens. I would be glad to hear suggestions and experiences from you. Thanks👍

06-10-2019, 07:58 AM   #2
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QuoteOriginally posted by PentaxMuc Quote
Hey,

i recently bought my first Pentax (K1) together with an old prime lens (M 50mm 1.7).
Now i want to get my first „new“ lens for the K1, but the decision is sort of hard for me...
Either the Sigma 35mm Art 1.4 or the DFA 28-105mm. According to the reviews both should be really fine lenses.
At the moment the primary uses would be Nature, Landscape, travel, Astro(never tried seriously) and maybe some portrait at festivities. The DFA seems to offer very much flexibility for a great price, but lacks a bit of aperture... the Sigma on the other hand should be very crispy, full of light but has the limitation of a prime lens. I would be glad to hear suggestions and experiences from you. Thanks👍
I think you've summed up the pros and cons of the two lenses pretty well. They are completely different beasts.

I'd base the decision on your objectives- do you value the added versatility of the zoom, or do you want to maximize image quality and artistic opportunities?

You could also compromise and meet in the middle with something like the D FA 24-70mm, which would give you a faster aperture and a bit wider field of view, which can make a big difference if you primarily shoot landscapes.

Personally, though, I would go for the 28-105mm, as it is an affordable lens that you can always have on hand as you add more and more primes to your collection over time.

Adam
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06-10-2019, 08:03 AM   #3
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QuoteOriginally posted by PentaxMuc Quote
Hey,

i recently bought my first Pentax (K1) together with an old prime lens (M 50mm 1.7).
Now i want to get my first „new“ lens for the K1, but the decision is sort of hard for me...
Either the Sigma 35mm Art 1.4 or the DFA 28-105mm. According to the reviews both should be really fine lenses.
At the moment the primary uses would be Nature, Landscape, travel, Astro(never tried seriously) and maybe some portrait at festivities. The DFA seems to offer very much flexibility for a great price, but lacks a bit of aperture... the Sigma on the other hand should be very crispy, full of light but has the limitation of a prime lens. I would be glad to hear suggestions and experiences from you. Thanks��
When I bought the K-1, I had the FA 35-80, FA 50 1.7, FA 50 macro,DA* 60-250, DA" 200 the DA 35 2.4, FA-J 18-35, Tamron 90 macro, Tamron 300 2.8 and Sigma 70 macro in my collection.

I wasn't happy with the camera until I bought the 28-105.
I am waiting for an ultra wide angle variable aperture zoom. with the FA-J 18-35 filling in until it arrives.

Just one guy's take.
But I'm a guy who almost never uses 35mm. I grew up with 55 mm on film and am accustomed to shooting at that focal length for primes. With nothing but 35mm my camera would rarely get used.
06-10-2019, 08:04 AM   #4
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I have both, and a bunch of other options in that range.

The DFA 28-105 is a must-have. It's relatively cheap, light and compact. It's weather resistant. Image quality is superb across its focal range. For nature/landscape/travel it is the first lens I pack.

If you want a versatile event/portrait lens, the DFA 24-70 might be a better option than the Sigma 35 Art. I still struggle to get consistent focus with the Sigma, but when I get it right it's certainly a superb lens.

06-10-2019, 08:34 AM   #5
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If you want to do a bit of everything and astro, your best choice if the D-FA 24-70, because you can use it at 24mm f2.8 (wide open) for astro. The D-FA 28-105 is great as a travel compact lens but it isn't bright enough for astro-photography. Take the D-FA 24-70 f2.8 .
06-10-2019, 08:38 AM   #6
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Another vote for the 28-105. It's a no-brainer on the K1.

I also have the Sigma 35 Art. It's a very good lens, but I don't actually use it very much. Expanding your collection beyond the DFA 28-105 may involve exploring one of the following directions:
  1. Fast "normal" prime, such as Sigma 35, FA 43 Ltd f/1.9, DFA 50 f/1.4, DA 55 f/1.4, FA 50 f/1.4, ...?
  2. Longer; wait for the DFA 70-200 f/4 or the ~65-300 telephoto zoom?
  3. Wider; DFA 15-30 f/2.8, several 3rd party manual primes, wait for the ultra wide prime on the DFA roadmap?

But the DFA 28-105 will keep you happy for some time.
06-10-2019, 08:41 AM   #7
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QuoteOriginally posted by PentaxMuc Quote
...primary uses would be Nature, Landscape, travel, Astro(never tried seriously) and maybe some portrait at festivities...
The DFA 28-105 is a great general purpose lens for the K-1. Image quality is excellent, it's relatively compact and light for carrying around all day, and is fairly priced. My general recommendation is for every K-1 user to start with the 28-105. Add specialty lenses later.

The 28-105 doesn't have a large aperture, though. That limits its astro low light usability. It also affect portraits if you want a very thin depth of field.

Other have already mentioned the 24-70. It offers the larger f2.8 aperture. It's a heavier and more expensive lens than the 28-105 but might fit your needs better if you want to do all the above with a single lens.
06-10-2019, 08:45 AM - 6 Likes   #8
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P.S. Here's an example of the 28-105 for astro.




06-10-2019, 08:55 AM   #9
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QuoteOriginally posted by biz-engineer Quote
If you want to do a bit of everything and astro, your best choice if the D-FA 24-70, because you can use it at 24mm f2.8 (wide open) for astro. The D-FA 28-105 is great as a travel compact lens but it isn't bright enough for astro-photography. Take the D-FA 24-70 f2.8 .
I think I agree with this, and I have and enjoy the 28-105, it is a very good lens.
Astro needs something <35mm and f2.8 so you would be looking for a prime to go with the 28-105. 24mm would also be good for places like aerospace museums, if you have that need.

One question back to you though, how often would you get to do Astro?. It can be frustrating planning for it only to find cloud cover spoiling the plan.
That happens to me alot. Even so I have started to think of the 24-70 as an option for a few use cases.
06-10-2019, 09:08 AM   #10
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Thanks for your answers so far! It seems as if the consensus favors the DFA 28-105 clearly over the Sigma. If i go this way the saved money would also allow another used prime lens or sth like that...

One thing that makes the sigma very interesting is the superb optics and sharpness everyone talks about😅
But not sure if someone can see a difference in normal prints?

Astro: well it would be nice to have the opportunity trying it out a little bit. But no major decision point.

The 24-70 is also interesting, yet another price class. Is 2.8 vs 3.5 worth it?
06-10-2019, 09:15 AM   #11
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I get a ton of use out of the 28-105. Reasonable price, reasonable size, versatile, fairly high quality.

For a landscape/astro lens, I'd go with a manual prime before I'd get the 24-70. A Rokinon/Samyang/Irix/Laowa or an older Pentax 20-24. The 15-30 or 11-18 would be good choices as well to pair with the 28-105, but both are a lot more expensive, and in the case of the 15-30, a lot bigger.
06-10-2019, 09:21 AM   #12
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QuoteOriginally posted by SteveinSLC Quote
I get a ton of use out of the 28-105. Reasonable price, reasonable size, versatile, fairly high quality.

For a landscape/astro lens, I'd go with a manual prime before I'd get the 24-70. A Rokinon/Samyang/Irix/Laowa or an older Pentax 20-24. The 15-30 or 11-18 would be good choices as well to pair with the 28-105, but both are a lot more expensive, and in the case of the 15-30, a lot bigger.
For astro I bought the Rokinon 14 2.8. Cheap and a top rated astro-lens on the astro photography sites.
06-10-2019, 09:21 AM   #13
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QuoteOriginally posted by DeadJohn Quote
P.S. Here's an example of the 28-105 for astro.
Sure it works at ISO6400, even slower lenses would work with higher ISO at the expense of image quality.

A fast wide manual prime for asto and the D-FA 28-105 would pair well.
06-10-2019, 09:27 AM   #14
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My first impression is something is wrong. I do a lot of street photography. I needed some reach at times and a little wider than my primes would give me. Granted 28mm is not at all wide but until something like an 18 - ??mm shows up the 28-105mm fills my style well.

I have found it to be a great walking around lens. I am happy with the build, the price is reasonable along with the size and weight.
06-10-2019, 10:31 AM - 1 Like   #15
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QuoteOriginally posted by biz-engineer Quote
Sure it works at ISO6400, even slower lenses would work with higher ISO at the expense of image quality.

A fast wide manual prime for asto and the D-FA 28-105 would pair well.
If someone has never done astro before, 28mm f3.5 is okay to get started. Many people dive into astro and soon give up due to local light pollution, uncooperative weather, work/sleep schedules, etc. Almost new equipment sits on a shelf or gets sold at a loss.

The OP should, IMO, pick one of these approaches:
  • Get the 24-70. It works well for all the desired types of photography.
  • Get the 28-105. It works well for most of the desired types of photography, and is fair for astro. Practice with it for a while. If the OP decides to stick with astro, add a specialized lens later.
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