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03-28-2013, 09:43 PM   #406
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QuoteOriginally posted by pearsaab Quote
a few from today...i love the longer days...500mm with p-k adapter setting 1.5




IMGP0206
by pearsaab, on Flickr
IMGP0206 | Flickr - Photo Sharing!






IMGP0295
by pearsaab, on Flickr
IMGP0295 | Flickr - Photo Sharing!




IMGP0305
by pearsaab, on Flickr
IMGP0305 | Flickr - Photo Sharing!




IMGP0268
by pearsaab, on Flickr
IMGP0268 | Flickr - Photo Sharing!
Like true pro, awesome as usual!

03-29-2013, 05:09 AM   #407
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QuoteOriginally posted by pearsaab Quote
500mm with p-k adapter setting 1.5
Wow those look good. So that would be somewhere around f/7.1?
03-29-2013, 06:19 PM   #408
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thanks guys...baronite 1.5 is about is between 4.5 and 5...setting 4 would be 7.1 at least that's my understanding...larry let me know if i'm wrong...amy

i actually find the 500 is very sharp at 4.5 to 5 so that is why is have the position so low
03-29-2013, 06:25 PM   #409
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here's a few with the da300

IMGP0317
by pearsaab, on Flickr
IMGP0317 | Flickr - Photo Sharing!


IMGP0322
by pearsaab, on Flickr
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IMGP0331
by pearsaab, on Flickr

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03-29-2013, 06:27 PM   #410
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QuoteOriginally posted by robtcorl Quote
Excellent shots Amy!
Can't wait for the goldfinch to get back to their summer colors.
We have a large river birch tree, and before long it will be filled with goldies feasting on its seeds.
Hope my skills with the Q are up to the capture task.
(boy are their highlights easily blown out though)
rob it is definitely interesting to see them change their colors...i wonder if the ones that change sooner are picked up by the females first
03-29-2013, 06:44 PM   #411
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QuoteOriginally posted by pearsaab Quote
thanks guys...baronite 1.5 is about is between 4.5 and 5...setting 4 would be 7.1 at least that's my understanding...larry let me know if i'm wrong...amy
1.5 on the Pentax adapter should be one and a half stops down. With the Sigma 500/4.5 I'm not sure if 4.5 is a third stop or half stop down from 4.0, but at any rate another stop and a half would be somewhere in the range of 7.1 to 8. Have you found the 1.5 setting to give the best results with this lens?
03-29-2013, 07:28 PM   #412
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QuoteOriginally posted by baro-nite Quote
1.5 on the Pentax adapter should be one and a half stops down. With the Sigma 500/4.5 I'm not sure if 4.5 is a third stop or half stop down from 4.0, but at any rate another stop and a half would be somewhere in the range of 7.1 to 8. Have you found the 1.5 setting to give the best results with this lens?
brain freeze.. 0 stop should be 4.5, 1 stop 5 and 1.5 between 5 and 5.6 i think or am i still screwed up...i like 1 to 1.5 just because i like the bokeh but haven't really had a chance to get it in long range situation with alot of light and low iso
03-30-2013, 07:14 AM   #413
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QuoteOriginally posted by pearsaab Quote
brain freeze.. 0 stop should be 4.5, 1 stop 5 and 1.5 between 5 and 5.6 i think or am i still screwed up...
Um, the latter. 1 stop from f/4.5 is either f/6.3 or f/6.7. I say either because of Pentax's strange use of 4.5 to signify both the 1/3 stop past 4.0, and the 1/2 stop past 4.0. So 1.5 stops from f/4.5 is either f/8 or a 1/6 of a stop up from that. That's pretty small for the Q, which is why I asked.

03-30-2013, 12:38 PM   #414
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QuoteOriginally posted by baro-nite Quote
Um, the latter. 1 stop from f/4.5 is either f/6.3 or f/6.7. I say either because of Pentax's strange use of 4.5 to signify both the 1/3 stop past 4.0, and the 1/2 stop past 4.0. So 1.5 stops from f/4.5 is either f/8 or a 1/6 of a stop up from that. That's pretty small for the Q, which is why I asked.
baro-nite is correct. One stop difference is either twice or half the aperture area (size of the hole in the aperture blades -- 2x the aperture area lets in 2x the mount of light) from your starting point. To calculate 1 stop difference in aperture value, you would either multiply or divide by a factor of 1.4x (sq root of 2 rounded) to go 1 stop slower or faster respectively. You can confirm that this is valid as the "standard' full stop values increment by a factor of 1.4x -- f1, f1.4, f2, f2.8, f4, f5.6. f8, etc.

f4.5 stopped down 1 full stop would be f4.5 x 1.4 = f6.3.

To calculate 1.5 stops, you'd use a 1.7x multiplication factor (sq root of 3 rounded), and for 2 stops, the factor is 2x (sq root of 4).

I do these calculations pretty much on a daily basis since I use TCs extensively (some would say excessively ) and know that I need to keep my max apertures at f8 or faster to get reasonable AF performance with my DSLR bodies.

Scott
03-30-2013, 06:26 PM   #415
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QuoteOriginally posted by snostorm Quote
baro-nite is correct. One stop difference is either twice or half the aperture area (size of the hole in the aperture blades -- 2x the aperture area lets in 2x the mount of light) from your starting point. To calculate 1 stop difference in aperture value, you would either multiply or divide by a factor of 1.4x (sq root of 2 rounded) to go 1 stop slower or faster respectively. You can confirm that this is valid as the "standard' full stop values increment by a factor of 1.4x -- f1, f1.4, f2, f2.8, f4, f5.6. f8, etc.

f4.5 stopped down 1 full stop would be f4.5 x 1.4 = f6.3.

To calculate 1.5 stops, you'd use a 1.7x multiplication factor (sq root of 3 rounded), and for 2 stops, the factor is 2x (sq root of 4).

I do these calculations pretty much on a daily basis since I use TCs extensively (some would say excessively ) and know that I need to keep my max apertures at f8 or faster to get reasonable AF performance with my DSLR bodies.

Scott
thanks guys...will need to play with it some more then
04-02-2013, 05:29 AM   #416
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dfa 100 with q-k adapter...setting 4

here's a few from yesterday with the dfa 100mm...get's frustrating when you're trying to take pictures on a windy day

inside a flower



IMGP0554 by pearsaab, on Flickr
IMGP0554 | Flickr - Photo Sharing!

the tiny weenie little hairs on a tiny weenie little flower



IMGP0541 by pearsaab, on Flickr
IMGP0541 | Flickr - Photo Sharing!

kind of hard to explain but the little tiny moss you see that has tiny little balls on it



IMGP0533 by pearsaab, on Flickr
IMGP0533 | Flickr - Photo Sharing!



IMGP0511 by pearsaab, on Flickr
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IMGP0520 by pearsaab, on Flickr
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04-02-2013, 09:00 AM   #417
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Excellent macros Amy. The first looks like a cartoon character.
04-02-2013, 11:51 AM   #418
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QuoteOriginally posted by crewl1 Quote
Excellent macros Amy. The first looks like a cartoon character.
thanks larry, it is actually the little bud inside the flower
04-02-2013, 08:51 PM   #419
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Vivitar 80-200 from 1970s on macro

Here is a comparison between the 02 lens and a Vivitar 80-200 macro on a tripod with the plain Fotodiox adapter, with SR off.
02 lens hand held, SR on, trying to fill the screen each time, but getting too close with the 02 in the end to make the first (top) picture bigger.
St Andrews cross spider. You may be able to make out how it's legs are over the cross.
Body is 1/4 inch wide.
Attached Images
   

Last edited by arnold; 04-03-2013 at 09:31 PM. Reason: added title
04-03-2013, 04:00 AM   #420
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When the purolator courier arrives in the next 2-6 days, I will start to contribute shots to this thread. One thing I have been wondering about, is whether we should petition Adam to make a separate LENS on Q photo archive.

It is a shame not to be able to link all the shots taken.

As another question for those watching this thread, I have, at present, 55 lenses. What would people like to see first? Since my K300/4 is already here, I think my tamron 200-500/5.6 and vivitar Series 1 70-210/3.5 version 1 and tak preset 200/3.5 will be first. But after that? I will put together a complete listing if people want to see something specific.
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