Tamron 24-70 F/2.8 Sharpness Issue
Mar 12, 2016 15:33:37 #
I recently made the switch from my Canon T4i to a Nikon D750 and based on many reviews and suggestions from some of you, bought a Tamron 24-70 F/2.8 lens. I was taking some test shots from my front porch today and was concerned that the sharpness at the edge is clearly better with my old Canon T4i and 18-135 mm kit lens. I am attaching four pictures and would appreciate your opinions. Two of the images were taken with the house across the street in the center of the frame and two with it at the right edge.
If you zoom in at 100% the house number at the right of the garage in the centered images is sharp with both camera/lens combinations. However, when the camera is moved left to place the house number at the edge of the frame, the D750/Tamron shows a much fussier house number. All four shots were taken at F/8 and 100 ISO. The Tamron lens was set at 30mm, which is virtually the same coverage as the Canon at 18mm.
Any thoughts would be greatly appreciated.
If you zoom in at 100% the house number at the right of the garage in the centered images is sharp with both camera/lens combinations. However, when the camera is moved left to place the house number at the edge of the frame, the D750/Tamron shows a much fussier house number. All four shots were taken at F/8 and 100 ISO. The Tamron lens was set at 30mm, which is virtually the same coverage as the Canon at 18mm.
Any thoughts would be greatly appreciated.
Mar 12, 2016 16:10:18 #
chemdoc wrote:
I recently made the switch from my Canon T4i to a ... (show quote)
There is a great deal more color aberration with the Canon combination than the Nikon. Most noticeable in the tree branches. The numbers themselves appear a bit less focused with the Nikon.
--Bob
Mar 12, 2016 16:34:01 #
rmalarz wrote:
There is a great deal more color aberration with the Canon combination than the Nikon. Most noticeable in the tree branches. The numbers themselves appear a bit less focused with the Nikon.
--Bob
--Bob
It is the focus that concerns me. I upgraded my equipment hoping for improved sharpness among other things. I would be interested in hearing from anyone who uses this lens to see if mine is simply subpar or is this normal performance.
Mar 12, 2016 16:57:13 #
you will need a better set of shots if you want any meaningful oppinions
Mar 12, 2016 16:57:24 #
chemdoc wrote:
It is the focus that concerns me. I upgraded my equipment hoping for improved sharpness among other things. I would be interested in hearing from anyone who uses this lens to see if mine is simply subpar or is this normal performance.
Have you performed a microfocus adjustment? This can make a big difference.
Mar 12, 2016 17:00:43 #
oldtigger wrote:
you will need a better set of shots if you want any meaningful oppinions
Could you suggest what type of images you would need to make an assessment? Thanks.
Mar 12, 2016 17:02:21 #
JimH123 wrote:
Have you performed a microfocus adjustment? This can make a big difference.
I have not done that yet. I am new to Nikon, but I seem to recall that this is not needed in live view but only when using the viewfinder. Is that accurate? I did use live view for all of the images. Thanks.
Mar 12, 2016 17:03:02 #
Where were you focus point(s)?
What type of focusing were you using?
What type of focusing were you using?
Mar 12, 2016 18:06:45 #
traveler90712 wrote:
Where were you focus point(s)?
What type of focusing were you using?
What type of focusing were you using?
I was using a single point focus on both cameras and had the focus box centered in the frame on both cameras. I am brand new to Nikon cameras so perhaps there is a better setting to use, but with my Canon I always use the single point focus.
Mar 12, 2016 19:02:00 #
chemdoc wrote:
... I did use live view for all of the images. Thanks.
the image quality on nikon 1 is too low to be useful for anything.
I use a tamron 24-70/2.8 and love it cause it gives me nice soft edges on landscapes.
Mar 13, 2016 07:45:10 #
The majority of the lenses are at their best in the center. Corners suffer the more you open the lens although some lenses are excellent also at the corners.
I have never used the Tamrom lens but I know it is a great lens although not perfect, indeed many lenses are not.
Understand that if you are going to be printing murals this Tamron lens is not for you. At 100% crop the printing size will be humongous and the distance at which the print is viewed increases to view it well.
I would be very satisfied with this Tamron since I never print beyond 13x19 but as I said, if you have in mind to print murals this Tamron is not the lens you need.
I have never used the Tamrom lens but I know it is a great lens although not perfect, indeed many lenses are not.
Understand that if you are going to be printing murals this Tamron lens is not for you. At 100% crop the printing size will be humongous and the distance at which the print is viewed increases to view it well.
I would be very satisfied with this Tamron since I never print beyond 13x19 but as I said, if you have in mind to print murals this Tamron is not the lens you need.
Mar 13, 2016 07:54:25 #
I also meant to say that I hope VR was off and the camera was on a tripod.
Mar 13, 2016 08:49:26 #
I downloaded the image resolution charts from LensTip.com testing of the Tamron 24-70mm f/2.8 and Canon 18-135mm f/3.5-5.6 IS STM lenses for both lens center and lens edge. It looks like the Canon has a little more sharpness at the center and edges. The Canon is resolving about 38 line pairs per millimeter at 18mm and f/8 at the edges. With the Tamron chart you have to guess a little since 30mm is not on the chart. The Tamron is resolving about 30 line pairs per millimeter at 24mm and f/8 at the edges.
Tamron 24-70mm f/2.8 center
Tamron 24-70mm f/2.8 edge
Canon EF-S 18-135mm IS STM center
Canon EF-S 18-135mm IS STM edge
Mar 13, 2016 09:27:56 #
camerapapi wrote:
I also meant to say that I hope VR was off and the camera was on a tripod.
:thumbup: :thumbup:
Mar 13, 2016 11:46:08 #
camerapapi wrote:
I also meant to say that I hope VR was off and the camera was on a tripod.
The camera was on a tripod but VR was on for both. I seem to remember reading that VR can be left on with the D750 but may be wrong.
Phil
If you want to reply, then register here. Registration is free and your account is created instantly, so you can post right away.