[aslyfox]

. . . On the other hand, and especially as to @Wpresto's point #4, I have the idea that tires are mainly "synthetic rubber", i.e., polymers of petrochemicals, which I expect will not make any useful contribution to the soil, and as been noted elsewhere, will probably be toxic until finally broken down by oxidation, UV light and bacterial action.. . . .

it may make a good photo but

Tires are not biodegradable: Tires can take hundreds or thousands of years to decompose. If you illegally dump them in nature, they’ll release toxins and poison the environment.

Where Can I Recycle Tires Near Me - Local Tire Recycling and Disposal

What’s Inside a Tire?
19% Natural rubber, usually from trees in Southeast Asia
38% Synthetic *rubber (butadiene, styrene, halobutyl rubber) and additives, to prevent damage from ozone and oxygen, and to promote curing
4% Synthetic-*polymer fabric belts (nylon, rayon, and aramid), for reinforcement
12% Wire (high-carbon steel), for *more reinforcement
26% Fillers (carbon black, silica

Our Waste Tire Problem Is Getting Worse

[aslyfox]

SMC Pentax-D FA 50mm F2.8 Macro

[Aaron28]

other critters of the backyard.....K-3ii.....tamron 90/f2.8DI.....af360fgz (manual)

[StephenMerola]

Maybe not true macros, but here are some shots from the garden yesterday with my new-to-me Sigma 105mm EX macro. I have wanted this lens for a long time and a non-DG version came up super cheap so I grabbed it. All were shot as DNG RAW files processed in DxO Photo Lab 3. I am currently using a trial version and considering buying the full version. I like it a lot so far. I decided to order prints of all three through SmugMug. I ordered some other 5x7s last week and the quality was nice so I ordered these a bit larger. The metallic prints they offer are really nice looking, especially for these types of compositions. Let me know what you think (good or bad).

---

Last edited by StephenMerola; 07-19-2020 at 01:30 PM.

[MKohoutek]

K 50mm/4 Macro on K1
Some type of stonecrop, starting to bloom.

[Shedking]

I'm not sure that I have ever posted a full-frame image from my 100WR to this thread. I'll rectify that omission with two from a visit to the National Arboretum at Westonbirt.

[kevinWE]

Another shot from the Day Lily group I shot yesterday.
(Fujinon EBC 55mm 3.5 Macro)

[Aaron28]

K-3ii....tamron 90/f2.8DI...af360fgz

[cobbu2]

Pink Lily after the rain,

Pentax KP
SMC Pentax-DA 1:2.8 35mm Macro Limited




The "Heart" of the Lily, same lens and camera.

[que es tu]

Hi ya'll!! I was referred here with my question from another thread. So, here it is: I shoot with an HD-DA 55-300 non PLM on a KP or K-S2. It has a MFD of approx 54 in and a max magnification of .28x. For fun I like to attach a Canon 500D close-up filter to it. This brings my MFD down to approx 18 in. Since I can now focus 3 times closer does this therefore increase the magnification by 3 times bringing it to .84x?? I know this is not true macro, but for $54 it is still fun!!

[WPRESTO]

Hi ya'll!! I was referred here with my question from another thread. So, here it is: I shoot with an HD-DA 55-300 non PLM on a KP or K-S2. It has a MFD of approx 54 in and a max magnification of .28x. For fun I like to attach a Canon 500D close-up filter to it. This brings my MFD down to approx 18 in. Since I can now focus 3 times closer does this therefore increase the magnification by 3 times bringing it to .84x?? I know this is not true macro, but for $54 it is still fun!!

Possibly. Figuring magnification with a zoom lens is tricky. Best way is to set the camera on a tripod (a table-top is actually easiest for this) ,, attach the 500D, set zoom to 300mm, and and using manual focus set to the closest focusing distance. Now move the rig toward a ruler set horizontally until it is sharp focus. This will show you 1) the minimum size object that will fill the frame; 2) the distance lens to subject for maximum magnification; 3) and if you want to do the calculation, compare the width of the ruler across the viewfinder (left to right) in millimeters. Divide 25.1 (= the width of an APS-C sensor in mm) by the width of the ruler that is visible. If 50mm of the ruler is visible, your magnification would be 0.5X. If only 25mm of the ruler is visible, you've go 1.0X = life size, and so on.

. I got good results with the original 55~300mm and a achromatic close-up lens, probably the same Canon 500D (I have one and also the 250D in 58mm). Best IQ, but not highest magnification, was with the lens at about 125~150mm

[que es tu]

Possibly. Figuring magnification with a zoom lens is tricky. Best way is to set the camera on a tripod (a table-top is actually easiest for this) ,, attach the 500D, set zoom to 300mm, and and using manual focus set to the closest focusing distance. Now move the rig toward a ruler set horizontally until it is sharp focus. This will show you 1) the minimum size object that will fill the frame; 2) the distance lens to subject for maximum magnification; 3) and if you want to do the calculation, compare the width of the ruler across the viewfinder (left to right) in millimeters. Divide 25.1 (= the width of an APS-C sensor in mm) by the width of the ruler that is visible. If 50mm of the ruler is visible, your magnification would be 0.5X. If only 25mm of the ruler is visible, you've go 1.0X = life size, and so on.

. I got good results with the original 55~300mm and a achromatic close-up lens, probably the same Canon 500D (I have one and also the 250D in 58mm). Best IQ, but not highest magnification, was with the lens at about 125~150mm

Great! Sounds like fun!! However, this is may be way out of my league because I have no idea how to measure something across the viewfinder!! I could learn, but I don't know if it is possible over a computer. I will see what I can do and any more advice is welcome and greatly appreciated! Thank you!! Oh yeah, here is a shot I took fooling around while on a recent backpacking trip in the Smokies. Disregard my last, the photo isn't uploading for some reason.

[que es tu]

I'll try that photo one more time. HD DA 55-300mm Non PLM at 300mm with Canon 500D close-up filter handheld.

[WPRESTO]

I'll try that photo one more time. HD DA 55-300mm Non PLM at 300mm with Canon 500D close-up filter handheld.

That looks close to, perhaps slightly more than life size (~1.0X). An APS-C sensor at 25.1mm is just about one inch wide, so if the beetle is slightly less than an inch long your magnification ratio is close to 1:1 = life size.

The use the ruler method I described, just move forward until the ruler is in focus, then carefully shift the ruler until the "zero" is at the left edge of the frame as seen through the viewfinder or on the screen, then read the measurement at the extreme right edge of the frame.

[rgknief60]

Was clipping the dead heads when I noticed the structure and a sight bit of color, so decided to investigate further.

Saved as animated GIF alternating between Color & BW.


6.5/36MP K-1 crop, resized to 1080 for GIF. 1/125 sec, f16, ISO 3200.




Bergamot