Micro Four Thirds Club

**WPRESTO** · 05-10-2022, 07:30 PM - **2 Likes**

Canada goose (the female I think) with four goslings. Pany G9 + Oly 300mm f4 & Oly 1.4X TC

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aaacb · 05-11-2022, 05:26 AM - **2 Likes**

northcoastgreg · 05-11-2022, 09:43 AM - **5 Likes**

Infrared, with the Pany 14-42:

**Kiddo70** · 05-11-2022, 10:46 AM - **6 Likes**

The lookout

Last edited by Kiddo70; 02-27-2023 at 12:57 PM.

**AgentL** · 05-11-2022, 10:53 AM - **4 Likes**

**WPRESTO** · 05-11-2022, 04:44 PM - **8 Likes**

Male bluebird with some food for his chicks, a beetle (I think) in the first image, a little spider in the second image.

**Kiddo70** · 05-12-2022, 11:51 AM - **6 Likes**

Wing study

Last edited by Kiddo70; 02-27-2023 at 12:57 PM.

Ivan · 05-12-2022, 01:45 PM

Originally posted by 3by2

To follow up on this I did some testing today on a tripod, with the camera manually focused to compare F stops at 140mm (It was meant to be 150 but for some reason I must have not fully twisted the lens, so I may have to go back and repeat it for OCD's sake).

The image below is a screenshot from Lightroom with the boat at 200%. As you can see there's no real difference between F4.0 and F6.3. This was consistent through the zoom range I tested. I would say the zoom sweet spot is between about 80 and 130 but there aren't huge differences, so in my view, it's all usable.

I also did a more controlled test of the focus variability I mentioned. In short, I found none, on either the 12-40 or the 40-150. And yet I have seen some differences. For the moment I'm putting this down to user error until I understand what it is I might be doing differently between shots. Or perhaps lighting conditions may play a part or subject contrast, it's something I need to understand better.

In my opinion, there is a difference. At F6.3, the image is sharper.

3by2 · 05-12-2022, 02:49 PM

Originally posted by Ivan

In my opinion, there is a difference. At F6.3, the image is sharper.

Yes I agree. What I meant by no real difference is that you probably wouldn't tell in most circumstances, given that's a 200% crop but yes it is slightly better. I would say the improvement happens about 5.6 maybe 5.0 but in reality I wouldn't be worried about using it at f4.

**WPRESTO** · 05-12-2022, 03:43 PM - **2 Likes**

Grackle that looks as if he's just discovered the paparazzi and is none too happy being photographed.

**luftfluss** · 05-12-2022, 07:17 PM - **2 Likes**

G9 + Tamron Adaptall-2 180/2.5 63B + Extension Tube 018F

Ivan · 05-13-2022, 01:04 AM

Originally posted by 3by2

Yes I agree. What I meant by no real difference is that you probably wouldn't tell in most circumstances, given that's a 200% crop but yes it is slightly better. I would say the improvement happens about 5.6 maybe 5.0 but in reality I wouldn't be worried about using it at f4.

I agree. This is the strength of Olympus photo lenses.

**pepperberry farm** · 05-13-2022, 06:27 AM - **3 Likes**

E-M1 with Lumix G Macro 30mm f2.8 ASPH

**Kiddo70** · 05-13-2022, 09:59 AM - **2 Likes**

Rambur’s Forktail

**Kiddo70** · 05-13-2022, 10:09 AM - **1 Like**

Variegated Fritillary

05-13-2022, 09:59 AM - 2 Likes	#4829
Kiddo70 Site Supporter Join Date: Aug 2020 Location: Arizona Posts: 1,414	Rambur’s Forktail Last edited by Kiddo70; 02-27-2023 at 12:57 PM.

05-13-2022, 10:09 AM - 1 Like	#4830
Kiddo70 Site Supporter Join Date: Aug 2020 Location: Arizona Posts: 1,414	Variegated Fritillary Last edited by Kiddo70; 02-27-2023 at 12:57 PM.

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05-12-2022, 01:45 PM	#4823
Ivan Pentaxian Join Date: Dec 2019 Location: Moscow Posts: 639	Originally posted by 3by2 To follow up on this I did some testing today on a tripod, with the camera manually focused to compare F stops at 140mm (It was meant to be 150 but for some reason I must have not fully twisted the lens, so I may have to go back and repeat it for OCD's sake). The image below is a screenshot from Lightroom with the boat at 200%. As you can see there's no real difference between F4.0 and F6.3. This was consistent through the zoom range I tested. I would say the zoom sweet spot is between about 80 and 130 but there aren't huge differences, so in my view, it's all usable. I also did a more controlled test of the focus variability I mentioned. In short, I found none, on either the 12-40 or the 40-150. And yet I have seen some differences. For the moment I'm putting this down to user error until I understand what it is I might be doing differently between shots. Or perhaps lighting conditions may play a part or subject contrast, it's something I need to understand better. In my opinion, there is a difference. At F6.3, the image is sharper.

05-12-2022, 02:49 PM	#4824
3by2 Closed Account Join Date: Feb 2019 Photos: Gallery \| Albums Posts: 819	Originally posted by Ivan In my opinion, there is a difference. At F6.3, the image is sharper. Yes I agree. What I meant by no real difference is that you probably wouldn't tell in most circumstances, given that's a 200% crop but yes it is slightly better. I would say the improvement happens about 5.6 maybe 5.0 but in reality I wouldn't be worried about using it at f4.

05-13-2022, 01:04 AM	#4827
Ivan Pentaxian Join Date: Dec 2019 Location: Moscow Posts: 639	Originally posted by 3by2 Yes I agree. What I meant by no real difference is that you probably wouldn't tell in most circumstances, given that's a 200% crop but yes it is slightly better. I would say the improvement happens about 5.6 maybe 5.0 but in reality I wouldn't be worried about using it at f4. I agree. This is the strength of Olympus photo lenses.

05-13-2022, 06:27 AM - 3 Likes	#4828
pepperberry farm amateur dirt farmer Join Date: Dec 2014 Location: probably out in a field somewhere... Photos: Gallery \| Albums Posts: 41,636	E-M1 with Lumix G Macro 30mm f2.8 ASPH

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