Pulled out the Vivitar Series-1 200mm ∱ 3.0

[DrEntropy]

Disappointed to find fungus in there. These with the D7500 in manual, 125th @ ∱8, ISO still at 800. A bit soft...

About five feet away:



This to see DoF, and point-of-focus is not sharp. About 20' and both shots on tripod

 

[DrEntropy]

I guess after forty-five years being hauled around in a leather bag, and almost twenty being mostly sat on a shelf in Florida, I've little to whine over. They all paid for themselves many times over.

 

[Basil]

I guess after forty-five years being hauled around in a leather bag, and almost twenty being mostly sat on a shelf in Florida, I've little to whine over. They all paid for themselves many times over.

That's a bit much to ask of any lens me thinks. Had you lived in New Mexico or Arizona it probably would not have been too bad.

 

[DrEntropy]

Same fleur, with the 70~300 DX set to 200mm. 1/200th @ ∱8 for settings. Much sharper, even hand-held.

 

[Basil]

Same fleur, with the 70~300 DX set to 200mm. 1/200th @ ∱8 for settings. Much sharper, even hand-held.

View attachment 81900

Looks about a stop darker than the first one.

 

[DrEntropy]

Looks about a stop darker than the first one.

Yup. Almost one stop from 125th sec. to 200th, to better compensate for hand-held.

 

[Basil]

Yup. Almost one stop from 125th sec. to 200th, to better compensate for hand-held.

Same ISO then?

 

[DrEntropy]

Yes, ISO 800. Intended to keep all else consistent. The lighting yesterday was from overcast sky. Today the background area was in shadow.

 

[DrEntropy]

The similar shot of the ferns with the zoom, same settings, and point-of-focus is much more obvious as well. Only difference is the top of this frame has sunlight hitting the greenery.

 

[GregW]

I just read an article on cleaning a lens of fungus. I didn't know it was possible.
> How to Remove Fungus from a Lens <
Or get a new lens. The Nikkor 180 f2.8 AIS has come down in price recently. I like mine a lot. DOF at 6' wide open is about a quarter inch.

 

[DrEntropy]

Thanks for the link, Greg. Interesting.
I may disassemble the 200 and try the ammonia/peroxide bath. I've used ammonia on a Q-Tip before with mixed results, never "soaked" optics with the 50/50 mix tho. Worth a try. All three prime longer lenses have some degree of the stuff in them, would like to have use of them with the DSLR's now.

Funny he uses a Sharpie pen. I used those to cover over light scuff marks on parts of used lenses & cameras we'd get as trade-in gear in the store I'd worked in here in the '80's. Wouldn't take in any lenses with fungus, tho.

 

[GregW]

If you use it, you have to name it. And weasel pee is taken.

 

[DrEntropy]

Well, it would seem consideration of use is needed as it has specific photographic use.

First impulse was "ox snot" but the NH3+H2O2 mix ain't that viscous.

On further consideration, it may be that elusive "Sharpening Fluid" ever-missing in the darkroom chemistry days. Like the Lucas wiring harness "smoke-in-a-bottle."

 

[DrEntropy]

 

[GregW]

If you want to stick with the name Ox Snot you could add some Methyl cellulose to the formula. That'll get the consistency you're looking for.

I've used a granular form in the past to make blended drinks like daiquiris on set that will keep their form for hours.

 

[DrEntropy]

And mashed potatoes for ice cream!

 

[Basil]

And mashed potatoes for ice cream!

Yum, what a great ice cream sundae that would make

 

[GregW]

Can't be worse than hot dog flavored popsicles.

 

[Basil]

Can't be worse than hot dog flavored popsicles.

Don't they call that a Corn Dog?

 

[GregW]

Not exactly.