[tuco]

Admiralty Head Lighthouse updates.
Pentax 67, 67 55mm, T-Max 100

[desertscape]

Diffraction totally kills resolution

I have had the 90-180 for many years now and agree that f/45 can be a problem. But on the positive side, I have used it on some macro work at f/45 and the images were published. You just can't enlarge them like the f/11 work. I can't recommend landscape work at f/45 with this zoom.

[RICHARD L.]

I have had the 90-180 for many years now and agree that f/45 can be a problem. But on the positive side, I have used it on some macro work at f/45 and the images were published. You just can't enlarge them like the f/11 work. I can't recommend landscape work at f/45 with this zoom.

I was disappointed to find out the 67 M 90-180 mm f/5.6 didn't perform better at small openings. For distant landscapes, it is excellent at f/8, f/11 and f/16. It starts going south at f/22, f/32 and f/45 are really getting bad. I still have to try it in close-ups, though I rarely take this kind of images (maybe I should do it more often). Thank you for your insight and we all know great images can be made successfully even if resolution isn't optimum.

Regards

[kaseki]

The width of the diffracted spot between the first nulls is 2.4 f (lambda/d) where lambda is the wavelength, say 0.5 microns, d is the aperture size, and f is the focal length. f/d is the f/no. Hence, 2.4 x 5E-7 x 45 = 54 microns. I believe this is much larger than a pixel on the 645Z sensor (somewhere near 5 microns, as I recall). Moral of this story: Use ND filters if minimum ISO plus a reasonable aperture is still too bright.

[desertscape]

I mostly use the 90-180 for macro work because it has the right focal length, the right stops and the zoom gives me latitude when framing. Fixed focal length lenses can require a lot of tripod adjustments when doing macro work, but not the zoom. This zoom with tubes is a proven combination for macro work.

[tuco]

A dilemma I find with macro work and medium format is either I go for really shallow DOF or really deep DOF. The in-between DOF feels out of place most the time for me. And with 90mm+ focal lengths you can forget about deep DOF unless you have a view camera or T/S lens.

500C/M, CB 60mm, 10mm Ext Tube, RPX 100, Rodinal

[mikeSF]

I went out to see the Sandhill Cranes this morning at Staten Island, in the California Delta:

Cruisin'
lens is the 645 600mm, but body is the K3ii. Hope I don't get banned...

[TDvN57]

I went out to see the Sandhill Cranes this morning at Staten Island, in the California Delta:

Cruisin'
lens is the 645 600mm, but body is the K3ii. Hope I don't get banned...

Mike I think the lens trumps and makes it MF :-)






As the sun was starting to draw lower the moths (I think they are moths) came flying around the flowers, twisting and turning so fast that actually seeing what they look like is impossible. I pulled out the 645z with 6x7 400mm and handheld with elbow support took a couple of lucky shots.

Shutter speed was 1/4000 and the initial shots were f8 and then I switched to f16 and upped the ISO from 2500 to 4000. Took about 40 shots in total with only one really clear where you can see the legs and mouth etc. But considering these things are so fast that by the time you realize to trigger the shutter they are already gone, so a success rate of 8% is not bad and I'm smiling.... Gotcha moment.

I think the four I got was because they made turns within my frame area and I got them on the tail end after the first twist/turn.[

[Ed Hurst]

Luna Park, in Milsons Point (Sydney), has a long and convoluted history. It was constructed in 1935 and became an iconic part of the harbourside scene - sitting in the shadow of the Harbour Bridge and alongside the North Sydney Olympic Pool (built for the 1938 Empire Games). Following a lethal fire in 1979, it closed and this prime part of Sydney real estate seemed likely to disappear. It was largely demolished but then, against the odds, rebuilt - operating until 1988, when it again closed due to concerns about its condition. It opened again in 1995, but closed once again following concerns about its state of repair and complaints from nearby residents about noise. It has been redeveloped yet again, reopening in 2004 - since when it has been open continuously. I don't want to tempt fate, but it seems secure now as part of the famous Harbour scene.

The famous Luna Park face is lit up for most of the day, but there are a few hours in the very early morning when its own lights go off and it's only illuminated by an adjoining floodlight, making a picture like this possible for someone mad enough to attempt it.

645Z with 25mm f4 DA lens
[IMG][/IMG]

[texandrews]

Luna Park, in Milsons Point (Sydney), has a long and convoluted history. It was constructed in 1935 and became an iconic part of the harbourside scene - sitting in the shadow of the Harbour Bridge and alongside the North Sydney Olympic Pool (built for the 1938 Empire Games). Following a lethal fire in 1979, it closed and this prime part of Sydney real estate seemed likely to disappear. It was largely demolished but then, against the odds, rebuilt - operating until 1988, when it again closed due to concerns about its condition. It opened again in 1995, but closed once again following concerns about its state of repair and complaints from nearby residents about noise. It has been redeveloped yet again, reopening in 2004 - since when it has been open continuously. I don't want to tempt fate, but it seems secure now as part of the famous Harbour scene.

The famous Luna Park face is lit up for most of the day, but there are a few hours in the very early morning when its own lights go off and it's only illuminated by an adjoining floodlight, making a picture like this possible for someone mad enough to attempt it.

645Z with 25mm f4 DA lens
[/url][/IMG]

Gettin' kinda surreal on us, Ed. I'm thinking about that Escher-ish shot also, plus some of those swimming tank shots...but this one is pretty over the top!

[maxloxton]

Luna Park, in Milsons Point (Sydney), has a long and convoluted history. It was constructed in 1935 and became an iconic part of the harbourside scene - sitting in the shadow of the Harbour Bridge and alongside the North Sydney Olympic Pool (built for the 1938 Empire Games). Following a lethal fire in 1979, it closed and this prime part of Sydney real estate seemed likely to disappear. It was largely demolished but then, against the odds, rebuilt - operating until 1988, when it again closed due to concerns about its condition. It opened again in 1995, but closed once again following concerns about its state of repair and complaints from nearby residents about noise. It has been redeveloped yet again, reopening in 2004 - since when it has been open continuously. I don't want to tempt fate, but it seems secure now as part of the famous Harbour scene.

The famous Luna Park face is lit up for most of the day, but there are a few hours in the very early morning when its own lights go off and it's only illuminated by an adjoining floodlight, making a picture like this possible for someone mad enough to attempt it.

645Z with 25mm f4 DA lens
[/url][/IMG]

What an excellent image. Can you pls elaborate the process? Is it a single image or multiple image merged in post?

[RICHARD L.]

[mikeSF]

Mike I think the lens trumps and makes it MF :-)






As the sun was starting to draw lower the moths (I think they are moths) came flying around the flowers, twisting and turning so fast that actually seeing what they look like is impossible. I pulled out the 645z with 6x7 400mm and handheld with elbow support took a couple of lucky shots.

Shutter speed was 1/4000 and the initial shots were f8 and then I switched to f16 and upped the ISO from 2500 to 4000. Took about 40 shots in total with only one really clear where you can see the legs and mouth etc. But considering these things are so fast that by the time you realize to trigger the shutter they are already gone, so a success rate of 8% is not bad and I'm smiling.... Gotcha moment.

I think the four I got was because they made turns within my frame area and I got them on the tail end after the first twist/turn.[

love the backlight and colors. wonderful

---------- Post added 11-27-20 at 01:39 PM ----------

Luna Park, in Milsons Point (Sydney), has a long and convoluted history. It was constructed in 1935 and became an iconic part of the harbourside scene - sitting in the shadow of the Harbour Bridge and alongside the North Sydney Olympic Pool (built for the 1938 Empire Games). Following a lethal fire in 1979, it closed and this prime part of Sydney real estate seemed likely to disappear. It was largely demolished but then, against the odds, rebuilt - operating until 1988, when it again closed due to concerns about its condition. It opened again in 1995, but closed once again following concerns about its state of repair and complaints from nearby residents about noise. It has been redeveloped yet again, reopening in 2004 - since when it has been open continuously. I don't want to tempt fate, but it seems secure now as part of the famous Harbour scene.

The famous Luna Park face is lit up for most of the day, but there are a few hours in the very early morning when its own lights go off and it's only illuminated by an adjoining floodlight, making a picture like this possible for someone mad enough to attempt it.

645Z with 25mm f4 DA lens
[/url][/IMG]

this has a wonderful pop-art vibe and really stimulates the senses, Ed. Love it.

[cobbu2]

Yellowstone Lake from Storm Point, Yellowstone National Park

Pentax 6x7 (early Honeywell Non-MLU), SMC Fisheye Takumar/6x7 35mm f/4.5, Kodak 320TXP (220), HC-110B

[WhatsMyNameAD67]

Admiralty Head Lighthouse updates.
Pentax 67, 67 55mm, T-Max 100

Those gray tones are cream in texture. Nice!

---------- Post added 11-27-20 at 08:58 PM ----------

Yellowstone Lake from Storm Point, Yellowstone National Park

Pentax 6x7 (early Honeywell Non-MLU), SMC Fisheye Takumar/6x7 35mm f/4.5, Kodak 320TXP (220), HC-110B

Great perspective!