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03-17-2012, 08:42 PM - 1 Like   #1
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K-01 for snapshots?

I was looking for a 35 mm equivalent lens for my K-01 to mimic my compact travel companion of yesteryear which - besides being film-based of course - had a quality 35mm lens on it.

Not being a proud owner of the DA 21mm which would be close enough I dusted off my smc Pentax-A 24mm F2.8 lens. While not super compact (actually not compact at all) it balances well on the K-01. I just need to go find a lens hood for it.



First discovery (which isn't surprising once you think about it): The K-01 doesn't care if it is set to manual focus or auto focus mode with a manual focus lens. In either case it lets you shoot whether or not the subject is in focus. There is no catch-in focus mode on the K-01.

Second discovery: Focus peaking is awesome! It is quite evident when the subject gets in focus. No need to strain your eyes watching that screen closely to determine focus - just look for the bright white outlines to pop up!

Well, most parts of my scene got white outlines at the same time with the 24mm lens so third discovery: Why care about focus in the first place? Set the lens to hyper-focal distance (match the read numeral on the distance scale with the read focus mark, use Av mode and set the the aperture to the one marked in red on the lens) and fire away! The depth of field on an APS-C camera is from about one meter to infinity!

To illustrate the above: This image was shot at the hyper-focal setting (2.2m 7ft F8). Click on it for the full size image (7.7 MB).



See you around, I'm going to play tourist in my own town with my new combo here!

03-17-2012, 09:27 PM   #2
dms
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For the reduced size sensor, (1.5 factor) the hyperfocal distance used should be that for one stop more open--i.e., for taking with f/8 you should use the hyperfocal value for f/5.6, or about 3.1 meter.
03-18-2012, 03:11 AM   #3
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Great, one of the uses I will have for K-01 as well. I hope Pentax makes a 28mm xs lens for this.
03-18-2012, 04:55 AM   #4
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Aha, good discoveries!

03-18-2012, 11:57 AM   #5
Ole
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QuoteOriginally posted by dms Quote
For the reduced size sensor, (1.5 factor) the hyperfocal distance used should be that for one stop more open--i.e., for taking with f/8 you should use the hyperfocal value for f/5.6, or about 3.1 meter.
You're right, or use the read markings on the lens and shoot at on stop slower, f/11.
03-18-2012, 01:05 PM   #6
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QuoteOriginally posted by Ole Quote
You're right, or use the read markings on the lens and shoot at on stop slower, f/11.
I make adjustments based on the intended focus zone.

* If it's hyperfocus (DOF extends to infinity), I adjust by a bit over 1 f-stop. So if the aperture is a f/11, I set the infinity mark to a little inside the f/8 mark, to around f/7 or so. This is a paranoia move, to ensure that infinity IS in focus.

* If it's zone-focus (DOF doesn't reach infinity), then I go with the 1-f-stop adjustment, but I figure the edges of the zone will be marginal. So with a 24mm lens at f/11, I might set the 1m and 7m marks just barely inside the f/8 marks, so I'm sure of DOF just barely inside that range.

Note that the DOF scales differ among lenses of the same focal length, often depending on the focus throw. So my Vivitar-Kiron 24/2 has a 180-degree throw, and DOF marks for f/4-8-11-16; while my Paragon-Cimko 24/2.8 has a 90-degree throw, and DOF marks only for f/8-11-16-22 --there's not enough action+space to mark f/2.8-4-5.6. The longer the throw, the better, IMHO.
03-21-2012, 05:55 PM   #7
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That's a really nifty setup!

I have a question related to snapshot usage. Does the K-01 have a mode where the LCD can be turned off, but the camera is still on and ready to take photos? The use case I'm thinking of is fitting an optical viewfinder for rough framing and relying on the lens' distance scale for zone focus, while keeping the LCD off to save on battery life.

Just curious. Any info from K-01 owners would be greatly appreciated.
03-21-2012, 06:12 PM   #8
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The Pentax K-01 does have an option that turns off the screen. It also has somewhat of an optical viewfinder available, but it is not completely matched. The optical viewfinder is specifically made for the Pentax Q, but will work (in sorts) on the K-01 hotshoe. It is not completely matched to the field of view of any Pentax lens, but should give the user a general idea of the field of view. The price of this optical viewfinder is a bit steep; at about 250.

03-21-2012, 06:53 PM - 1 Like   #9
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QuoteOriginally posted by Medium FormatPro Quote
The Pentax K-01 does have an option that turns off the screen. It also has somewhat of an optical viewfinder available, but it is not completely matched. The optical viewfinder is specifically made for the Pentax Q, but will work (in sorts) on the K-01 hotshoe. It is not completely matched to the field of view of any Pentax lens, but should give the user a general idea of the field of view. The price of this optical viewfinder is a bit steep; at about 250.
As an alternative to the Q finder, you can get the Olympus VF-1 for around $99 and is matched to the FoV you would get with a 24mm lens on the K-01.
03-22-2012, 01:16 AM   #10
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QuoteOriginally posted by Ole Quote
... I dusted off my smc Pentax-A 24mm F2.8 lens. While not super compact (actually not compact at all) it balances well on the K-01. I just need to go find a lens hood for it
Try step-down adapter rings.

Each of the lenses in this photo has a 49-37 followed by a 37-30.5mm adapter ring.There's a good chance it works for a 24mm lens:



The lens attached to the camera is a 28mm F/2.8. It has a single 49-28mm adapter ring:

03-22-2012, 07:05 AM   #11
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QuoteOriginally posted by Swift1 Quote
As an alternative to the Q finder, you can get the Olympus VF-1 for around $99 and is matched to the FoV you would get with a 24mm lens on the K-01.
Many thanks Siwft1; just saved me about $150.

Note to Pentax though... Any possibilities of matching a new K-01 only optical viewfinder to show a one lens or multi lens perspective??
03-22-2012, 03:37 PM   #12
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Thanks for the info!
03-29-2012, 12:44 PM   #13
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QuoteOriginally posted by SOldBear Quote
Try step-down adapter rings.

Each of the lenses in this photo has a 49-37 followed by a 37-30.5mm adapter ring.There's a good chance it works for a 24mm lens:



The lens attached to the camera is a 28mm F/2.8. It has a single 49-28mm adapter ring:
SOldBear,

Have you tried the single 49-28mm step down ring on DA 15mm, DA 21mm, DA 40mm AND any 24mm lenses? I wonder how it goes with the vignette. It just looks modern, IMO, on your 28mm lens.
03-30-2012, 12:05 AM   #14
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QuoteOriginally posted by zany225 Quote
SOldBear,

Have you tried the single 49-28mm step down ring on DA 15mm, DA 21mm, DA 40mm AND any 24mm lenses? I wonder how it goes with the vignette. It just looks modern, IMO, on your 28mm lens.
DA 15mm is too wide for step down ring.

DA 21mm can use 49-37mm. The photo in my post above shows the DA 21mm having 49-37 and 37-30,5, but that results in vignetting.

DA 40mm already has 49-30.5mm. I don't see any reason to try 49-28.

I don't have any 24mm lens to try (sold mine after I bought the DA 21mm). But the 24mm lens in question is designed for 35mm full frame. My guess is that 49-37 + 37-30.5 will work (I haven't yet seen a 49-30.5 ring).
03-30-2012, 03:00 PM   #15
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QuoteOriginally posted by SOldBear Quote
DA 15mm is too wide for step down ring.

DA 21mm can use 49-37mm. The photo in my post above shows the DA 21mm having 49-37 and 37-30,5, but that results in vignetting.

DA 40mm already has 49-30.5mm. I don't see any reason to try 49-28.

I don't have any 24mm lens to try (sold mine after I bought the DA 21mm). But the 24mm lens in question is designed for 35mm full frame. My guess is that 49-37 + 37-30.5 will work (I haven't yet seen a 49-30.5 ring).
Thanks,

So it's better to use only 49-37mm for DA 21mm.

The reason I ask is because all DA limiteds have unique hoods. They are made from aluminium and black painted. So it's easy to get some scratches and the paint get off. So I think to not using original hoods and keep them in the boxes then use the other cheaper hoods instead. But I don't like the regular hoods that are being sold on e-bay or wherever.

When I saw yours they are just just like the hood of DA 40mm limited and look beauty. So I want to make sure if they work for the others limiteds or maybe 24mm lenses (may be the next limited from Pentax ). Moreover, I'm so surprised that the 49-28mm can do it's job on 28mm lens! I thought it could be too narrow for wide angle lens like 28mm. So I'm thinking if you ever tried it on the others, especially, 24mm and DA 40mm lenses.

Sunny
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