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Tamron 17-50/2.8 vs Minolta 24-50/4, primes, etc.

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QuietOC View Drop Down
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Topic: Tamron 17-50/2.8 vs Minolta 24-50/4, primes, etc.
    Posted: 25 June 2016 at 04:30
A brief comparison at 24, 28, 30, 35, and 50 mm F/4 or so and close focus.

Tamron SP AF 17-50mm F2.8 XR Di II LD Aspherical aka "----" below
Minolta AF 24mm F2.8
Minolta AF 24-50mm F4
Minolta AF 24-85mm F3.5-4.5
Minolta AF 28mm F2.8
Sony DT 30mm F2.8 Macro SAM
Sony DT 50mm F1.8 SAM
Sony DT 18-55mm F3.5-5.6 SAM II
Sony DT 18-135mm F3.5-5.6 SAM
Sony DT 16-105mm F3.5-5.6

24mm f/4 Center Crop


24mm f/4 Top Left


24mm f/4 Bottom Right


28mm f/4 Center Crop


28mm f/4 Top Left


28mm f/4 Bottom Right


30mm f/4 Center Crop


30mm f/4 Top Left


30mm f/4 Bottom Right


35mm f/4 Center Crop


35mm f/4 Top Left


35mm f/4 Bottom Right


50mm f/4 Center Crop


50mm f/4 Top Left


50mm f/4 Bottom Right


Edited by QuietOC - 25 June 2016 at 04:36
Sony A7RIV LA-EA5
Pentax Q7 5-15 15-45/2.8 8.5/1.9 11.5/9
 



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skm.sa100 View Drop Down
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Post Options Post Options   Quote skm.sa100 Quote  Post ReplyReply Direct Link To This Post Posted: 25 June 2016 at 05:23
Thanks for sharing this.
I'd like to run a few comparisons myself. Where did you get a test chart?

Thanks,
Sashi
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QuietOC View Drop Down
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 25 June 2016 at 05:32
I downloaded this one by Stephen H. Westin of Cornell University and printed it on a 13" x 19" sheet.

My printer doesn't do that well printing it. I am not sure why--it is vector art.

The choice of paper matters. Here is close-up of my first print of the chart on normal copy paper:



Here is the second print on Canon Photo Paper Pro Luster


It was supposed to be grayscale. The current one is the third print, and it is a bit better than the second, but it is still aliased and colorful.

I would pay for a decent chart. Some people print multiple small charts.

Edited by QuietOC - 25 June 2016 at 05:52
Sony A7RIV LA-EA5
Pentax Q7 5-15 15-45/2.8 8.5/1.9 11.5/9
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Miranda F View Drop Down
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Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Posted: 25 June 2016 at 07:10
I generally use A3 sheets and print the chart so it fills half the image width. This way the resolution of the printer is distinctly better than the sensor. I centre the shot on the rh edge where I have drawn some large black rectangles to focus on, and check the lh edge where I have drawn large triangles, so the points are just in shot.

re the lenses, the dt 50mm seems to come out well, and the dt zooms aren't disgraced in the corners either, though clearly some of them are worse than others.

Anyway, thanks for sharing these tests. It's nice to check subjective impressions against tests occasionally.

Miranda F & Sensorex, Sony A7Rii, A58, Nex-6, Dynax 4, 5, 60, 500si/600si/700si/800si, various Sony & Minolta lenses, several Tamrons, lots of MF primes and *far* too many old film cameras ...
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Post Options Post Options   Quote djfoxy Quote  Post ReplyReply Direct Link To This Post Posted: 28 June 2016 at 23:05
What was your process to achieve the results?

Tripod + remote + center focus point in manual focus + multi segment metering mode ?

Anyway great job considering the time needed. Always useful to know the limitations of a lens
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QuietOC View Drop Down
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 29 June 2016 at 01:05
Manual focus with magnification on the rear screen with lots of wiggling the focus back and forth. I've ordered an HDMI cable for the A65 so I can use a 1920x1080 monitor.

I just use the standard wide metering with +1 ev exposure comp dialed in from checking the histogram. I definitely could use a better light source.

Edited by QuietOC - 29 June 2016 at 01:17
Sony A7RIV LA-EA5
Pentax Q7 5-15 15-45/2.8 8.5/1.9 11.5/9
 



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Post Options Post Options   Quote djfoxy Quote  Post ReplyReply Direct Link To This Post Posted: 29 June 2016 at 06:53
Still it's very nice to achieve this with the screen of the A58 :)

Good job here.

Doing MF with a lens like 18-55 dt Sam is a mission. Did you notice if the end of your barrel is wobbling? Mine does definitely :s
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 29 June 2016 at 23:35
For anyone considering it, live-view on the A65 hdmi output only uses a 4:3 center crop in the 16:9 1920x1080 output, and the actual sensor view is an additional 3:2 crop (or 16:9 crop) of that 4:3 crop. So, hdmi live-view on the A65 displays at most 1440x960 pixels--that still better than 1024x683 pixels on the EVF or 640x427 pixels on the rear screen.

It sounds like the A33/A35/A55 cameras didn't have this 4:3 crop on their live-view HDMI output maybe since they had 16:9 displays.

All lenses with moving parts those parts wobble some amount. I find the telephoto zooms the worst. The hardest time I've had is using the 55-300 with several teleconverters to image the moon. The moon doesn't sit still either.

Edited by QuietOC - 30 June 2016 at 21:47
Sony A7RIV LA-EA5
Pentax Q7 5-15 15-45/2.8 8.5/1.9 11.5/9
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Miranda F View Drop Down
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Post Options Post Options   Quote Miranda F Quote  Post ReplyReply Direct Link To This Post Posted: 01 July 2016 at 09:35
Originally posted by QuietOC QuietOC wrote:

The hardest time I've had is using the 55-300 with several teleconverters to image the moon. The moon doesn't sit still either.


Yes, It's only when you fit a couple of TCs on a long lens you realise *just* how fast it shifts across the sky! IIRC it's about a degree every four minutes, so it basically shifts by its own width every two minutes. Just as well it's bright enough not to need long exposures!

The trouble is, if you want to fill the screen instead of cropping heavily, you've got a fairly short time to focus it accurately before it disappears again.

And if it *does* fill the screen, getting it in shot isn't trivial either. With my 500mm mirror and two TCs, I almost need a spotting scope to align it.    
Miranda F & Sensorex, Sony A7Rii, A58, Nex-6, Dynax 4, 5, 60, 500si/600si/700si/800si, various Sony & Minolta lenses, several Tamrons, lots of MF primes and *far* too many old film cameras ...
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