Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
01-03-2014, 10:26 PM   #1
Pentaxian




Join Date: Apr 2013
Location: Brisbane, Australia
Posts: 621
Hard decision on 25DA or Sony A7r + Canon 17TSE

Hi all,

I am having a tough time deciding how to fill my ultra-wide angle needs right now.

I really need to get to that 17-20mm (35mm equivalent) focal length, for not only landscape work but for taking pictures of my work (interiors of home cinema rooms and homes).

For the price of around 5k I can get a Pentax 25mm DA (or D-FA) lens and I will get to 19.5mm FOV, with no shift.

For roughly the same price and weight I can get an A7/A7r with the excellent Canon 17mm TSE lens.

I do need some sort of lighter weight backup kit to my 645D, so maybe the Sony A7 is the way to go and bypass the 25mm DA altogether.

My only problem with the above thought process is that if I was to buy the 25mm DA, I would do away with my 35mm A as I could get by with the 25mm DA, 55mm D-FA and 90mm D-FA Macro that I have and be quite happy.

Any comments would be most welcome.

Thanks, Scott

01-03-2014, 11:27 PM   #2
Veteran Member
Silent Street's Avatar

Join Date: Nov 2011
Location: Geelong & Richmond, Vic AUS
Posts: 537
Why is Canon's 17mm TS-E PC lens excellent?
In my long professional experience with all of Canon's TS-E PC lenses (since 1994), and recent use of this lens, I have concluded it is one of the most difficult lenses to work with because of its extreme angle of view and inherent naturally great depth of field — in fact I would skip 35mm entirely and utilise the more fluid and precise movements of large format (5x4 and above). That said, with the prime attributes of depth of field and clarity met, on what basis did Canon introduce tilt and shift into the lens? This question is best left to Canon, because a lot of us just do not know why this was done, other than to impress a small market. It is a very specialised, expensive optic and the better ones in the line-up have a more sensible and useful set of attributes for landscape and interiors, among the 24mm and 45mm.

Interior photography requires rectilinear, highly corrected optics that do not introduce distortion — even Canon's TS-E lenses, as highly corrected as they are, will introduce distortion which cannot be corrected by subsequent movements. The wider the lens, the smaller details will be and the greater the risk of distorion the moment the lens is moved up or down.
01-04-2014, 01:08 AM   #3
Veteran Member
revdocjim's Avatar

Join Date: Jan 2011
Location: Mt. Akagi, Gunma Prefecture
Posts: 374
Others know far more about this stuff than do I. So my comment is limited to your last statement. Just looking at the numbers, I can see why you might let go of the 35mm once you had the 25mm, but if you actually look at the lenses I can't imagine trading in the delightfully compact 35mm for the obnoxiously long, large and heavy 25mm. Even if I was fortunate enough to own the 25mm I don't think I would ever see it as a replacement for the 35mm. But that's just me...
01-04-2014, 12:12 PM   #4
Veteran Member
FrankC's Avatar

Join Date: Dec 2011
Photos: Gallery
Posts: 318
Would taking several shots and stitching them together be out of the question? I would image it would be if you're working with an art director or a client whose looking over your shoulder and needs an instant image to review. There's several good options to allow for taking panos while eliminating the parallax problem one has with taking several images. Gigapan and RRS just to name a few.

01-06-2014, 12:32 PM   #5
Veteran Member
Ryan Tischer's Avatar

Join Date: Feb 2012
Location: Duluth, Minnesota
Photos: Albums
Posts: 435
I can't speak on T/S lenses, but I wouldn't give up my 645 35mm for anything! Probably half of my best landscape shots were taken with that lens...it is very sharp, easy to use, light, and makes great sun stars from f/16 to f/22 on the 645D.


I've thought about getting the a7r as well, but am going to wait until I read a few more reviews on it and also discover what lenses work best on it. Best of luck!
01-15-2014, 10:22 PM   #6
Senior Member




Join Date: Dec 2011
Posts: 126
I have the a7r as well as the 25mm DA lens. I would advise you to wait until pentax actually does something with the 645D before you continue to invest more money into a potentially dead end system. I still love the 645D and the 25mm lens is great but not perfect, especially on a camera that has a tendency to have sub par auto focus in less than perfect situations. The lens if focused properly is insanely sharp, but degrades dramatically if the focus is slightly off. Good luck focusing it manually; the wide depth of field makes it very difficult to judge the precise line of focus in the viewfinder, especially in lower light.

I should be blindly suggesting you buy the pentax lens on a pentax forum, but I don't think the company deserves your money at the moment. They have been dragging their feet for a while and until they give you a reason to continue supporting them, hold off. Unless you have fanboy or sentimental reasons it does not make sense at this stage of the game.

Having said that, the camera has been really good to me and still has the edge in a lot of shooting situations. Good luck shooting in cold and bad weather wearing thick gloves with the A7r. Both cameras are going with me to Antarctica and the Patagonian wilderness next week, and I suspect they are both going to complement each other depending on the situation and time of day. I also hope ricoh will release a long awaited upgrade to the 645D, something with a 60 or 80mp sensor and a much improved auto focus system. If they do, I'm certainly going to buy it, along with the 90mm 2.8 which I have been holding off on for the same reasons you should hold off on the 25mm unless 5k is a totally irrelevant amount of money to you.
01-16-2014, 01:05 AM   #7
Pentaxian




Join Date: Apr 2013
Location: Brisbane, Australia
Posts: 621
Original Poster
QuoteOriginally posted by larkis Quote
I have the a7r as well as the 25mm DA lens. I would advise you to wait until pentax actually does something with the 645D before you continue to invest more money into a potentially dead end system. I still love the 645D and the 25mm lens is great but not perfect, especially on a camera that has a tendency to have sub par auto focus in less than perfect situations. The lens if focused properly is insanely sharp, but degrades dramatically if the focus is slightly off. Good luck focusing it manually; the wide depth of field makes it very difficult to judge the precise line of focus in the viewfinder, especially in lower light.

I should be blindly suggesting you buy the pentax lens on a pentax forum, but I don't think the company deserves your money at the moment. They have been dragging their feet for a while and until they give you a reason to continue supporting them, hold off. Unless you have fanboy or sentimental reasons it does not make sense at this stage of the game.

Having said that, the camera has been really good to me and still has the edge in a lot of shooting situations. Good luck shooting in cold and bad weather wearing thick gloves with the A7r. Both cameras are going with me to Antarctica and the Patagonian wilderness next week, and I suspect they are both going to complement each other depending on the situation and time of day. I also hope ricoh will release a long awaited upgrade to the 645D, something with a 60 or 80mp sensor and a much improved auto focus system. If they do, I'm certainly going to buy it, along with the 90mm 2.8 which I have been holding off on for the same reasons you should hold off on the 25mm unless 5k is a totally irrelevant amount of money to you.
Thanks Larkis.

I have the 90mm f/2.8 and its amazing. I would prefer that they release the wide zoom that is listed on the roadmap as that might take filters as I use Lee Filters all of the time.

I think you are right, I may have to wait. I love the camera and the only real reason that I bought it over the Leica S2 was for the ability to shoot exposures over 2 mins.

If Pentax does not release any info in the coming 6 months of an upgrade it will be disappointing. Hell, even Phase one releases product on a quicker cycle.

On another note, I am thinking of purchasing one of the RhinoCam systems so that I can make some use of my Sony Nex6 plus the 645 35mm A lens and shoot Panos that way. Has anybody tried the Rhinocam yet?

Thanks
01-18-2014, 10:41 AM   #8
Site Supporter




Join Date: Nov 2011
Location: pontiac mi.
Posts: 353
QuoteOriginally posted by 2351HD Quote
Hi all,

I am having a tough time deciding how to fill my ultra-wide angle needs right now.

I really need to get to that 17-20mm (35mm equivalent) focal length, for not only landscape work but for taking pictures of my work (interiors of home cinema rooms and homes).

For the price of around 5k I can get a Pentax 25mm DA (or D-FA) lens and I will get to 19.5mm FOV, with no shift.

For roughly the same price and weight I can get an A7/A7r with the excellent Canon 17mm TSE lens.

I do need some sort of lighter weight backup kit to my 645D, so maybe the Sony A7 is the way to go and bypass the 25mm DA altogether.

My only problem with the above thought process is that if I was to buy the 25mm DA, I would do away with my 35mm A as I could get by with the 25mm DA, 55mm D-FA and 90mm D-FA Macro that I have and be quite happy.

Any comments would be most welcome.

Thanks, Scott
if we are still talking about the 645d, I came up with a clever solution. I bought a .05 aux screw on lens and a step down ring that fit on my 45mm f 2.8.i now have a 22mm field, a sharp image, and it was well under $100.00

Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
25da or sony, 25mm, camera, canon, d-fa, da, decision on 25da, lens, medium format, sony, sony a7r canon, weight
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pentax 645D vs Sony A7R RAW JohnBee Non-Pentax Cameras: Canon, Nikon, etc. 22 06-10-2015 09:23 PM
Test of some Pentax lenses on Sony A7r maccalb Pentax SLR Lens Discussion 3 01-03-2014 06:33 PM
What do you think of Sony's new a7 and a7r? OldNoob Non-Pentax Cameras: Canon, Nikon, etc. 104 12-31-2013 06:39 AM
Trey Ratcliff with the Sony A7r jogiba Non-Pentax Cameras: Canon, Nikon, etc. 8 12-27-2013 05:23 PM
First look at Sony's A7r FF mirorless body JohnBee Non-Pentax Cameras: Canon, Nikon, etc. 160 10-24-2013 08:22 AM



All times are GMT -7. The time now is 08:58 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top