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Tamron SP 35mm f/1.8 Di VC on GFX50s
  
 
engardeknave
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p.1 #1 · p.1 #1 · Tamron SP 35mm f/1.8 Di VC on GFX50s


Tamron SP 35mm f/1.8 performs pretty well on the GFX. It's the equivalent of a 28 f/1.4. I shot it stuck at f/1.8, but it also looked good at greater aperture values.

https://imgur.com/a/YA8Nr



Oct 29, 2017 at 06:18 PM
engardeknave
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p.1 #2 · p.1 #2 · Tamron SP 35mm f/1.8 Di VC on GFX50s


(I have no idea how to post photos that fit on the screen here without using Flickr. I am not signing up for Flickr.)


Oct 29, 2017 at 06:20 PM
gilgabo
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p.1 #3 · p.1 #3 · Tamron SP 35mm f/1.8 Di VC on GFX50s


engardeknave wrote:
Tamron SP 35mm f/1.8 performs pretty well on the GFX. It's the equivalent of a 28 f/1.4. I shot it stuck at f/1.8, but it also looked good at greater aperture values.

https://imgur.com/a/YA8Nr


Thanks for sharing this. I've wondered about coverage of the Sigma ART 35/1.4, but haven't considered the Tamron. What you've posted looks quite promising....please share as you capture more with this combination. Thanks!!



Oct 29, 2017 at 06:48 PM
Steve Spencer
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p.1 #4 · p.1 #4 · Tamron SP 35mm f/1.8 Di VC on GFX50s


engardeknave wrote:
Tamron SP 35mm f/1.8 performs pretty well on the GFX. It's the equivalent of a 28 f/1.4. I shot it stuck at f/1.8, but it also looked good at greater aperture values.

https://imgur.com/a/YA8Nr


Are these square crops? They looks square to me, but maybe I am not perceiving it right. Not to be pedantic, but at this aspect ratio, it is the equivalent of a 26 f/1.3 lens on FF 35mm.



Oct 29, 2017 at 07:59 PM
 

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engardeknave
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p.1 #5 · p.1 #5 · Tamron SP 35mm f/1.8 Di VC on GFX50s


Steve Spencer wrote:
Are these square crops? They looks square to me, but maybe I am not perceiving it right. Not to be pedantic, but at this aspect ratio, it is the equivalent of a 26 f/1.3 lens on FF 35mm.


The aspect ratio is 4:3. How are you getting those numbers? Maybe I'm doing it wrong.



Oct 29, 2017 at 08:41 PM
Steve Spencer
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p.1 #6 · p.1 #6 · Tamron SP 35mm f/1.8 Di VC on GFX50s


engardeknave wrote:
The aspect ratio is 4:3. How are you getting those numbers? Maybe I'm doing it wrong.


I use Lee Saxon's calculator which is a little page he set up just for doing these sort of comparisons. You can find it here:

http://www.leesaxon.com/pages/calculator.php

I had worked out the math on my own previously. The thing to keep in mind is that if it is a 4 X 3 aspect ratio, then you would need to crop a 3 X 2 sensor quite a bit to get that aspect ratio, so you are in effect using a slightly cropped FF 35mm sensor. When comparing aspects ratios of 4 X 3 or squarer the crop factor is .73. When you are comparing 3 X 2 aspects ratios (or skinnier rectangles) then you need to crop the miniMF sensor so you are in effect using a cropped miniMF sensor. The crop factor for 3 X 2 or skinnier rectangles is .82. You can let Lee's calculator do all the work, however, and just use compare sensor by height button for 4 X 3 for squarer crops and compare sensor by width for 3 X 2 or skinnier rectangular crops. These apply the .73 and .82 crop factors respectively.



Oct 29, 2017 at 08:50 PM
engardeknave
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p.1 #7 · p.1 #7 · Tamron SP 35mm f/1.8 Di VC on GFX50s


Steve Spencer wrote:
The thing to keep in mind is that if it is a 4 X 3 aspect ratio, then you would need to crop a 3 X 2 sensor quite a bit to get that aspect ratio, so you are in effect using a slightly cropped FF 35mm sensor. When comparing aspects ratios of 4 X 3 or squarer the crop factor is .73. When you are comparing 3 X 2 aspects ratios (or skinnier rectangles) then you need to crop the miniMF sensor so you are in effect using a cropped miniMF sensor. The crop factor for 3 X
...Show more

a 35mm f/1.8 lens
with a 43.8 x 32.9 mm sensor
produces Field of View : 64.07 x 50.35 x 76.09 (WxHxD)
which is comparable to...
a 27.6mm f/1.42 lens
with a 36 x 24 mm sensor



I guess it depends on your basis of comparison. I'd think the diagonal would be the most accurate representation of DOF, being a number that reflects the area of sensor. I use width to understand my angle of view horizontally.



Oct 29, 2017 at 09:44 PM
Steve Spencer
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p.1 #8 · p.1 #8 · Tamron SP 35mm f/1.8 Di VC on GFX50s


engardeknave wrote:
I guess it depends on your basis of comparison. I'd think the diagonal would be the most accurate representation of DOF, being a number that reflects the area of sensor. I use width to understand my angle of view horizontally.


The diagonal is only accurate for describing depth of field if you don't crop either image, but then the images don't look the same anyway. If you crop to the same aspect ratio the height figures are more accurate for depth of field for 4 X 3 and squarer and the width figures are more accurate for depth of field if you crop to 3 X 2 or a skinnier rectangle.



Oct 30, 2017 at 02:09 AM







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