Adaptall Mount Club (Tamron).

tim60 · 01-02-2022, 11:51 PM

Originally posted by Lon da Yooper

Lens tests! Cold outside with snow getting deeper have decided to do resolution tests on a bunch of lenses. Test subject I one of second daughters pastel self portraits left behind when she moved out. Testing by f-stop to see resolution improvements or drop off can be pretty reliable by file size to plot a lenses peak performance. Color and contrast figures in to this as well. This started out by testing the fifties to truly see the hoopla of my Super Takumar m42 50mm f1.4 8 element was true as I have a later 71-72 vintage 7 element to compare with, it’s no myth.
Full subject shot with the $2 sleeper lens a Tamron 70-150 f3.5. An SP 200-500 f5.6 for these shots all at ISO 200 and f5.6 with my K-7. Peak performance of this and my SP 300mm f2.8 are at the low end of f-scale from wide open to f11 where they drop off. 200mm,300mm, 400mm and 500 mm in these pics. It’s a keeper and could even improve if the mold is cleaned from a zoom element. element.https://www.pentaxforums.com/forums/attachment.php?attachmentid=560668&d=1641148848

---------- Post added 01-02-22 at 01:48 PM ----------

https://www.pentaxforums.com/forums/attachment.php?attachmentid=560669&d=1641148848

---------- Post added 01-02-22 at 01:50 PM ----------

https://www.pentaxforums.com/forums/attachment.php?attachmentid=560671&d=1641149053

---------- Post added 01-02-22 at 01:52 PM ----------

https://www.pentaxforums.com/forums/attachment.php?attachmentid=560672&d=1641149053

---------- Post added 01-02-22 at 01:55 PM ----------

https://www.pentaxforums.com/forums/attachment.php?attachmentid=560673&d=1641149053

Can you explain the relationship of picture quality to file size. Is this with RAW files?

I think I have seen something like this but I have not investigated.

Lon da Yooper · 01-03-2022, 06:23 AM

Originally posted by tim60

Can you explain the relationship of picture quality to file size. Is this with RAW files?

I think I have seen something like this but I have not investigated.

I’m tight on space with laptop so went back to only jpegs. With the K-7 set at highest resolution I can scroll across the files and see the size difference getting fourteen files by f-stop click on the old 50mm f1.4 Takumar’s. Using Photoscape I’ve just been hitting auto for exposure and sharpening a crisp visually appealing lens will go from 10.7mb to 15mb + when saved at 100% quality. It also shows the good qualities at 100% crop. The minor adjustments when a lens is not at peak f-stop have little effect on file size, it’s just not there.

tim60 · 01-03-2022, 11:50 PM

Originally posted by Lon da Yooper

I’m tight on space with laptop so went back to only jpegs. With the K-7 set at highest resolution I can scroll across the files and see the size difference getting fourteen files by f-stop click on the old 50mm f1.4 Takumar’s. Using Photoscape I’ve just been hitting auto for exposure and sharpening a crisp visually appealing lens will go from 10.7mb to 15mb + when saved at 100% quality. It also shows the good qualities at 100% crop. The minor adjustments when a lens is not at peak f-stop have little effect on file size, it’s just not there.

Thanks. I think I will have a look into Photoscape.

**luftfluss** · 01-06-2022, 03:04 PM - **9 Likes**

200-500/5.6 31a

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**marcusBMG** · 01-06-2022, 03:23 PM - **1 Like**

Don't tell me you took the BIF hand holding the 31A....

very good results luftluss.

**luftfluss** · 01-06-2022, 03:44 PM - **1 Like**

Originally posted by marcusBMG

Don't tell me you took the BIF hand holding the 31A....

very good results luftluss.

Yup, hand-held with that BIF GBH. That was before I injured my left shoulder, though, so not sure I could do that today.

The grebe photo I basically had to freelens, as just when I lined things up the P/KA adapter came apart, so I held the lens up to the body - I would not have shot at f/5.6 otherwise. I rarely see grebes, so when I got home I was gratified that even though the image was low-contrast and had that slightly hazy look from spherical aberration, the 31A captured a decent amount of detail. Quality work by the good folks at Tamron.

Lon da Yooper · 01-07-2022, 08:13 PM

Originally posted by luftfluss

Yup, hand-held with that BIF GBH. That was before I injured my left shoulder, though, so not sure I could do that today.

The grebe photo I basically had to freelens, as just when I lined things up the P/KA adapter came apart, so I held the lens up to the body - I would not have shot at f/5.6 otherwise. I rarely see grebes, so when I got home I was gratified that even though the image was low-contrast and had that slightly hazy look from spherical aberration, the 31A captured a decent amount of detail. Quality work by the good folks at Tamron.

So what your saying is I shouldn’t be shooting offhand with my 31A after three shoulder surgeries?

I’m shocked out how good this lens really is. A beast yes but everything else is to like. Sharp from f5.6 to f13 then slowly drops off. Much better color and contrast then my 60B. A warming filter in the rear bay really looks good.

**luftfluss** · 01-07-2022, 09:35 PM - **9 Likes**

Originally posted by Lon da Yooper

So what your saying is I shouldn’t be shooting offhand with my 31A after three shoulder surgeries?

I’m shocked out how good this lens really is. A beast yes but everything else is to like. Sharp from f5.6 to f13 then slowly drops off. Much better color and contrast then my 60B. A warming filter in the rear bay really looks good.

Maybe what I'm saying is... I should have rehabbed my shoulder! There is some definite atrophy there. Or maybe you're just stronger than me.

It is surprising, I guess, how sharp so many of the Tamron Adaptalls are. I didn't get into photography until the 2000's, so Tamron had discontinued the line by the time I began shooting, but I'm a bit shocked at how many people are so dismissive of Tamron, considering their legacy of really good glass.

**steamloco76** · 01-12-2022, 09:13 AM - **4 Likes**

January sunrise, as the crow flies. 23A 60-300mm f3.8-5.4 on K-70

**luftfluss** · 01-23-2022, 09:53 PM - **7 Likes**

A trio of Abigail I shot last year with the 180/2.5 63B...

**John in OZ** · 01-29-2022, 04:32 AM - **7 Likes**

Large Huntsman Spider. Adaptall 70-210mm 52A at f/11 85mm on K-x. Took a few shots to get what I was after. Took same with Canon 5DIV and 100mm EF Macro. Sure better resolution. I liked this composition better and the colours soo good.

**luftfluss** · 02-08-2022, 09:40 AM - **7 Likes**

180/2.5 63B + 018F extension tube...

**steamloco76** · 02-11-2022, 05:26 AM - **6 Likes**

19AH Pre WWII United States industrial scrap waiting, endlessly, for its turn in the electric furnace.. Indiana, Pennsylvania.

**John in OZ** · 02-11-2022, 06:17 PM - **1 Like**

Originally posted by steamloco76

19AH Pre WWII United States industrial scrap waiting, endlessly, for its turn in the electric furnace.. Indiana, Pennsylvania.

steamloco76
Love this shots. Well presented. Thanks for sharing.

**John in OZ** · 02-14-2022, 04:17 AM - **1 Like**

Thought I'd share a couple of dawn photo's taken this morning. Love the colours. Eastland Ringwood, Victoria Australia. *ist DS, Tamron Adpatall-2 70-210mm f3.8-4 model 46A.

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01-02-2022, 11:51 PM	#4396
tim60 Pentaxian Join Date: Apr 2011 Photos: Albums Posts: 8,756	Originally posted by Lon da Yooper Lens tests! Cold outside with snow getting deeper have decided to do resolution tests on a bunch of lenses. Test subject I one of second daughters pastel self portraits left behind when she moved out. Testing by f-stop to see resolution improvements or drop off can be pretty reliable by file size to plot a lenses peak performance. Color and contrast figures in to this as well. This started out by testing the fifties to truly see the hoopla of my Super Takumar m42 50mm f1.4 8 element was true as I have a later 71-72 vintage 7 element to compare with, it’s no myth. Full subject shot with the $2 sleeper lens a Tamron 70-150 f3.5. An SP 200-500 f5.6 for these shots all at ISO 200 and f5.6 with my K-7. Peak performance of this and my SP 300mm f2.8 are at the low end of f-scale from wide open to f11 where they drop off. 200mm,300mm, 400mm and 500 mm in these pics. It’s a keeper and could even improve if the mold is cleaned from a zoom element. element.https://www.pentaxforums.com/forums/attachment.php?attachmentid=560668&d=1641148848 ---------- Post added 01-02-22 at 01:48 PM ---------- https://www.pentaxforums.com/forums/attachment.php?attachmentid=560669&d=1641148848 ---------- Post added 01-02-22 at 01:50 PM ---------- https://www.pentaxforums.com/forums/attachment.php?attachmentid=560671&d=1641149053 ---------- Post added 01-02-22 at 01:52 PM ---------- https://www.pentaxforums.com/forums/attachment.php?attachmentid=560672&d=1641149053 ---------- Post added 01-02-22 at 01:55 PM ---------- https://www.pentaxforums.com/forums/attachment.php?attachmentid=560673&d=1641149053 Can you explain the relationship of picture quality to file size. Is this with RAW files? I think I have seen something like this but I have not investigated.

01-03-2022, 06:23 AM	#4397
Lon da Yooper Junior Member Join Date: Dec 2021 Location: Michigan’s Upper Peninsula Posts: 26	Originally posted by tim60 Can you explain the relationship of picture quality to file size. Is this with RAW files? I think I have seen something like this but I have not investigated. I’m tight on space with laptop so went back to only jpegs. With the K-7 set at highest resolution I can scroll across the files and see the size difference getting fourteen files by f-stop click on the old 50mm f1.4 Takumar’s. Using Photoscape I’ve just been hitting auto for exposure and sharpening a crisp visually appealing lens will go from 10.7mb to 15mb + when saved at 100% quality. It also shows the good qualities at 100% crop. The minor adjustments when a lens is not at peak f-stop have little effect on file size, it’s just not there.

01-03-2022, 11:50 PM	#4398
tim60 Pentaxian Join Date: Apr 2011 Photos: Albums Posts: 8,756	Originally posted by Lon da Yooper I’m tight on space with laptop so went back to only jpegs. With the K-7 set at highest resolution I can scroll across the files and see the size difference getting fourteen files by f-stop click on the old 50mm f1.4 Takumar’s. Using Photoscape I’ve just been hitting auto for exposure and sharpening a crisp visually appealing lens will go from 10.7mb to 15mb + when saved at 100% quality. It also shows the good qualities at 100% crop. The minor adjustments when a lens is not at peak f-stop have little effect on file size, it’s just not there. Thanks. I think I will have a look into Photoscape.

01-06-2022, 03:23 PM - 1 Like	#4400
marcusBMG Site Supporter Join Date: Nov 2012 Location: North Wales Photos: Gallery \| Albums Posts: 2,869	Don't tell me you took the BIF hand holding the 31A.... very good results luftluss.

01-06-2022, 03:44 PM - 1 Like	#4401
luftfluss Site Supporter Join Date: Jun 2011 Location: NJ Photos: Gallery \| Albums Posts: 11,626	Originally posted by marcusBMG Don't tell me you took the BIF hand holding the 31A.... very good results luftluss. Yup, hand-held with that BIF GBH. That was before I injured my left shoulder, though, so not sure I could do that today. The grebe photo I basically had to freelens, as just when I lined things up the P/KA adapter came apart, so I held the lens up to the body - I would not have shot at f/5.6 otherwise. I rarely see grebes, so when I got home I was gratified that even though the image was low-contrast and had that slightly hazy look from spherical aberration, the 31A captured a decent amount of detail. Quality work by the good folks at Tamron.

01-07-2022, 08:13 PM	#4402
Lon da Yooper Junior Member Join Date: Dec 2021 Location: Michigan’s Upper Peninsula Posts: 26	Originally posted by luftfluss Yup, hand-held with that BIF GBH. That was before I injured my left shoulder, though, so not sure I could do that today. The grebe photo I basically had to freelens, as just when I lined things up the P/KA adapter came apart, so I held the lens up to the body - I would not have shot at f/5.6 otherwise. I rarely see grebes, so when I got home I was gratified that even though the image was low-contrast and had that slightly hazy look from spherical aberration, the 31A captured a decent amount of detail. Quality work by the good folks at Tamron. So what your saying is I shouldn’t be shooting offhand with my 31A after three shoulder surgeries? I’m shocked out how good this lens really is. A beast yes but everything else is to like. Sharp from f5.6 to f13 then slowly drops off. Much better color and contrast then my 60B. A warming filter in the rear bay really looks good.

02-11-2022, 06:17 PM - 1 Like	#4409
John in OZ Site Supporter Join Date: Sep 2020 Location: Ringwood, Victoria Photos: Gallery \| Albums Posts: 348	Originally posted by steamloco76 19AH Pre WWII United States industrial scrap waiting, endlessly, for its turn in the electric furnace.. Indiana, Pennsylvania. steamloco76 Love this shots. Well presented. Thanks for sharing.