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Photo Forum / Digital Photography / DSLR Cameras / October 2007

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what pentax lens for indoor portrait?

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map - 11 Jan 2007 08:55 GMT
hi everyone,
(and especially pentax specialists)

I own a K100D and use the kit zooms very likely outdoors, but indoor, when I
want to take portraits of my kids, I prefer my old 50mm f2 M-mount to avoid
using the flash. my problem is this lens is manual focus and I miss 9/10
pictures because of the focus error : I need about 5seconds to make a good
focus but my kids are not so still! (and the DOF at F2 is really small). I
saw pentax propose a  77mm f1.8 but it is 800euros! is there other solutions
to have an autofocus portrait lens ? (with older but AF lenses?)
thank you very much.
Jon B - 11 Jan 2007 10:53 GMT
> hi everyone,
> (and especially pentax specialists)
[quoted text clipped - 7 lines]
> to have an autofocus portrait lens ? (with older but AF lenses?)
> thank you very much.

Any of the old AF lenses should fit the K100D also, what about a used
Pentax 50mm f1.4 or f1.7 AutoFocus?
Signature

Jon B
Above email address IS valid.
<http://www.bramley-computers.co.uk/> Apple Laptop Repairs.

map - 11 Jan 2007 13:21 GMT
>> hi everyone,
>> (and especially pentax specialists)
[quoted text clipped - 15 lines]
> Any of the old AF lenses should fit the K100D also, what about a used
> Pentax 50mm f1.4 or f1.7 AutoFocus?

would be great ! I didn't found those lenses because I thought I could find
them on ebay.fr (france), but there is none! on ebay.com, I found both
apertures in F and FA types. the F is cheaper, but what is the drawback of F
versus FA?
is there other alternatives?
thanks again.
Jon B - 11 Jan 2007 15:15 GMT
> >> hi everyone,
> >> (and especially pentax specialists)
[quoted text clipped - 22 lines]
> is there other alternatives?
> thanks again.

Here are two f1.7s
280067119056
250068993508

I suspect the F isn't autofocus, or it could just be poorly listed, but
without seeing any I can't be sure, I jumped ship from Pentax MF to
Canon AF when I made the move to digital. Pentax didn't have as a good a
range of digital bodies available then, but if it weren't for Sigma it
looks like there would be very few lenses for Pentax either.

New Alternatives?
Sigma 20mm f1.8
Sigma 24mm f1.8
Sigma 30mm f1.4
Sigma 50mm f2.8 Macro (tad on the dark side imo)
Sigma 18-50 f2.8 (see above)

Tamron 28-75 f2.8

Looks like a lot of eBayers must be clinging tight to what they've
bought, very little on there.
Signature

Jon B
Above email address IS valid.
<http://www.bramley-computers.co.uk/> Apple Laptop Repairs.

John Francis - 11 Jan 2007 17:42 GMT
>> > Any of the old AF lenses should fit the K100D also, what about a used
>> > Pentax 50mm f1.4 or f1.7 AutoFocus?
[quoted text clipped - 7 lines]
>
>I suspect the F isn't autofocus, or it could just be poorly listed ...

The F is autofocus, just like the FA.
For almost all practical purposes the F will do just as well - if you
can find one cheaper than an FA go for it!

The difference, for those who care, is that the FA lens returns rather
more information over the digital signal pin than does the F - things
such as the MTF curve.  This additional information is only of use if
you have a high-end body (such as the K10D), and are using the more
esoteric variations of the automatic exposure modes.
map - 12 Jan 2007 08:55 GMT
>>> > Any of the old AF lenses should fit the K100D also, what about a used
>>> > Pentax 50mm f1.4 or f1.7 AutoFocus?
[quoted text clipped - 13 lines]
> For almost all practical purposes the F will do just as well - if you
> can find one cheaper than an FA go for it!

I saw FAs at about 200$ and Fs at 70$ on ebay, whatever f1.7 or f1.4...

> The difference, for those who care, is that the FA lens returns rather
> more information over the digital signal pin than does the F - things
> such as the MTF curve.  This additional information is only of use if
> you have a high-end body (such as the K10D), and are using the more
> esoteric variations of the automatic exposure modes.

thank you very much for this precision, I'll looking for a F mount 50mm.
map - 12 Jan 2007 09:01 GMT
> Here are two f1.7s
> 280067119056
> 250068993508

thanks!

> New Alternatives?
> Sigma 20mm f1.8
[quoted text clipped - 4 lines]
>
> Tamron 28-75 f2.8
thanks, but too much wide angle or not enough open (2.8 is not so bad, but
at home I need 2 at 800iso (and the 50-200 kit zoom is f4 at 50mm so the
2.8/4 ratio makes not a big difference)
tomm42 - 11 Jan 2007 13:44 GMT
> hi everyone,
> (and especially pentax specialists)
[quoted text clipped - 7 lines]
> to have an autofocus portrait lens ? (with older but AF lenses?)
> thank you very much.

You can try to find an autofocus 50, shouldn't be too expensive. Wow a
77mm f1.8 at 800 euros? The going price for a Nikon 85 f1.8 in the US
is under $400.
You can also try to learn how to use manual focusing. Kids make it
difficult, random movements. The key is to pre focus, make sure you
have some depth of field (f5.6 and up) and enough shutter speed (1/100
and up). Use your ISO control to get to those parameters. I understand
the 1/focal length handholding rule, just think more speed is necessary
to stop the kids in their tracks.
Good luck

Tom
tomm42 - 11 Jan 2007 13:50 GMT
> hi everyone,
> (and especially pentax specialists)
[quoted text clipped - 7 lines]
> to have an autofocus portrait lens ? (with older but AF lenses?)
> thank you very much.

Sorry didn't read closely enough, INDOORS. That makes things tougher,
you need to wait for things to slow down, or use flash, if you don't
like the on camera flash get a hotshoe model. Pentax probably makes an
over priced one, but the auto features will help. Don't get the
cheapest, higher output equals a more flexible flash. While the on
camera flash is only good to 10-15 ft, a hotshoe model should cover any
situation in a normal sized house. Other brands to consider, Metz or
Sunpak.

Tom
Paul Mitchum - 11 Jan 2007 21:54 GMT
> hi everyone,
> (and especially pentax specialists)
[quoted text clipped - 7 lines]
> other solutions to have an autofocus portrait lens ? (with older but AF
> lenses?)

The 50mm has been replicated in the FA 50/1.4, which is a thoroughly
excellent lens for not a lot of money.

The Limited 77mm is worth the money, if you have the money to spend. :-)

You should also consider getting a flashgun with a tilt head. This will
let you bounce light off the ceiling indoors, for a more natural look. I
found an old Vivitar flash at a thrift store for <$10, and put it on a
Wein hot shoe adaptor (to avoid frying the camera), for just such a use.
map - 12 Jan 2007 09:05 GMT
> You should also consider getting a flashgun with a tilt head. This will
> let you bounce light off the ceiling indoors, for a more natural look.

doesn't this makes poeple looking tired as the light comes from above
(shadow under the eyes) ?

> I found an old Vivitar flash at a thrift store for <$10, and put it on a
> Wein hot shoe adaptor (to avoid frying the camera), for just such a use.

very interesting, thanks
Marc Sabatella - 12 Jan 2007 15:23 GMT
>> You should also consider getting a flashgun with a tilt head. This
>> will
[quoted text clipped - 3 lines]
> doesn't this makes poeple looking tired as the light comes from above
> (shadow under the eyes) ?

Bounced light doesn't cause particularly strong shadows, so I would say
no.  And you can also bounce light off walls, if your flash supports
that.  Realistically, this is how many professional photographers shoot,
so I wouldn't assume it doesn't work well, just because some book
somewhere mentioned that this might in some cases be a potential
drawback.

A *really* cheap/easy way to start experimenting with flash is an
external slave flash like the Sunpak DS-20 that you could use either
wireless in conjunction with the onboard flash, or with just a cheap
shoe adapter & cable.

But FWIW, I would also normally rather try to shoot without flash.

You may find, however, that in light low enough that f/2.8 & ISO 800
isn't good enough, the light also won't be good enough for auto-focus to
work quickly or reliably.  So you may actually be better off in the long
run just learning to manual focus more quickly.  A split focus screen
might help, if one is available for your particular model (I think there
are some available for most Pentax DSLR's).

---------------
Marc Sabatella
marc@outsideshore.com

Music, art,  & educational materials
Featuring "A Jazz Improvisation Primer"
http://www.outsideshore.com/
ABS - 21 Oct 2007 00:50 GMT
Well, this sounds like information I could use.  Please advise on which
hotshoe adapter is best to use on a Pentax K100D with an old Vivitar 2500.  I
have this flash here but don't want to fry my camera.  Almost bought a new
flash (YIKES!) but read this.  Be nice to avoid spending $300.00 on a flash!

Thanks!

>> hi everyone,
>> (and especially pentax specialists)
[quoted text clipped - 11 lines]
>found an old Vivitar flash at a thrift store for <$10, and put it on a
>Wein hot shoe adaptor (to avoid frying the camera), for just such a use.
Marc Sabatella - 12 Jan 2007 02:35 GMT
The most popular lens for this sort of thing is the FA50/1.4, which you
can buy new for well under $200 US.  At least in theory.  The lens is in
rather short supply, it seems.  The actual list price is somewhat over
$200, but Pentax has been offering a $50 rebate on it, although I gather
that is US only.

> I saw pentax propose a  77mm f1.8 but it is 800euros!

This is also a very popular lens, but definitely more of a luxury item.
It goes for a little under $600 here in the US - again, with help of a
$100 rebate - but folks who have it *love* it.

An option worth considering is a zoom in the 28-75/2.8 range.  Sigma,
Tamron, and Tokina all make some, although I forget if they are
available for Pentax or which are considered better than which.  But
they go for under $400 US.

---------------
Marc Sabatella
marc@outsideshore.com

Music, art,  & educational materials
Featuring "A Jazz Improvisation Primer"
http://www.outsideshore.com/
map - 12 Jan 2007 09:08 GMT
thanks marc,
I let you have a look at my previous answers to jon and john...
Pete D - 14 Jan 2007 05:08 GMT
The new 70mm F2.8 Sigma macro, it is a stunner.

> hi everyone,
> (and especially pentax specialists)
[quoted text clipped - 8 lines]
> lenses?)
> thank you very much.
 
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