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08-16-2014, 11:38 PM   #1
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645 25mm or 28-45mm

Just to start a discussion really...

With the 28-45mm zoom coming out, how do people view this against the 25mm for landscape work?

If you have the 25mm will you add the 28-45, or if you still need wider than the 35mm A or FA, would you be adding the 25mm or the zoom?

What do you think the pros and cons are between each of these - again for landscape work?

Thanks

Phil

08-16-2014, 11:46 PM   #2
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The 25mm is really quite wide (equivalent to 19mm on FF, 15mm on APSC), so for many applications I think the 28-45mm will be more appropriate, though we have yet to see how it fares optically compared to the 25mm.

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08-16-2014, 11:59 PM   #3
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I should have added - assuming the optical performance is equal to the 25mm :-)
08-17-2014, 12:26 AM   #4
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Also consider the inclusion of optical image stabilization, Filters are also something to think about the Pentax DA 645 25mm f4 ASPH uses 40.5 mm filters which aren't all that commom.

08-17-2014, 01:03 AM   #5
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I am again assuming landscape work will be tripod based and therefore OS on the lens will not be a benefit. Filters is a point, but only in that grad NDs are not easy used on the 25mm
08-17-2014, 01:48 AM   #6
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I take a lot of photos handheld with my Z just as I did with the D. I'm not sure what I will do whether I will use the 25 as collateral for the zoom as 3 mm might not be much off the 45 end but its a lot off the wide end
08-17-2014, 03:42 AM   #7
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I have ordered the 28-45 for a couple of reasons.

First is the OS. I use a tripod all the time, but miss shots some time due to the set up time, just last week I lost a good shot.

Second is filters and the fact that I don't like the drop in concept. Dust etc can easily get in there. I use lee big and little stoppers so the ability to use them is valuable.

Third is space. I can leave the 35mm A at home, as well as the 55 DFA. With 50mp I am happy to gain the extra DOF at 45mm and crop down to 55mm equivalent if needed. Not to mention that the new zoom will most likely be better than the 55dfa.

That's my thoughts.
08-17-2014, 03:49 AM   #8
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QuoteOriginally posted by 2351HD Quote
Not to mention that the new zoom will most likely be better than the 55dfa.
Considering the performance of the HD Pentax-DA 20-40mm f/2.8-4 Limited DC WR lens Zoom lens, I wouldn't get my hopes up.

08-17-2014, 04:32 AM   #9
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QuoteOriginally posted by Digitalis Quote
Considering the performance of the HD Pentax-DA 20-40mm f/2.8-4 Limited DC WR lens Zoom lens, I wouldn't get my hopes up.
You have a point. Haha
08-17-2014, 09:52 AM   #10
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If the new DA 28-45mm is optically good, I'll probably add it for landscape and travel work at some point. But it won't replace my DA 25mm, at least not for everything. I don't use the 25mm all the time, but when I need it, I really need it. I'm quite willing stitch and all the rest in post when absolutely necessary. But those extra 3mm are most critical at the ultra-wide angle end of the focal length range, so I don't see giving them up.
08-17-2014, 07:20 PM   #11
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Here is a comparison of the field of view from the 25mm and the new zoom. Thanks to Alex Munoz for the instagram post.

Last edited by Thomasbrowphoto; 11-12-2014 at 04:36 PM.
08-17-2014, 10:31 PM   #12
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Thanks for that Thomas, I think it demonstrates the 25 is for many still needed.
08-17-2014, 11:10 PM   #13
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QuoteOriginally posted by Thomasbrowphoto Quote
Here is a comparison of the field of view from the 25mm and the new zoom. Thanks to Alex Munoz for the instagram post.
Wow that is good to see. It's not actually as big of a difference as I would have thought.

Diglloyd tested the 25 and said that it roughly has the same horizontal angle of view as the zeiss 21. Makes sense considering the aspect ratio difference.

So really the 25 would be better for tighter interiors or perhaps tight landscapes with foreground interest. But for most other landscape the 28-45 will be right on target.

Good to see this.
08-19-2014, 01:25 PM   #14
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Thanks all

Interesting comments. For me I need something wider (currently have the 35mm A for that end) and having done a lot of my pre-Pentax work with a Zeiss 21mm, I keep wishing for a bit wider.

Thought it would be the 25mm, but the 28-45mm has made me stop and consider the zoom. Normally I am a prime lens person, but if the zoom performs it could give me the wide end and also replace the 35mm and likely the 55mm.

Hmmm. But will it perform better or equal to the 25mm at my normal f/11 to f/16?

Phil
08-19-2014, 04:08 PM   #15
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QuoteOriginally posted by MrPhil Quote
Thanks all

Interesting comments. For me I need something wider (currently have the 35mm A for that end) and having done a lot of my pre-Pentax work with a Zeiss 21mm, I keep wishing for a bit wider.

Thought it would be the 25mm, but the 28-45mm has made me stop and consider the zoom. Normally I am a prime lens person, but if the zoom performs it could give me the wide end and also replace the 35mm and likely the 55mm.

Hmmm. But will it perform better or equal to the 25mm at my normal f/11 to f/16?

Phil

I will be able to tell you that answer in the first week of September as my 28-45 is due then.

I would like to think that at f11-16 it will be as good, or even better as they have had time to get this right and without the need for it to be DFA coverage.
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