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Arpe · 11-13-2006, 04:48 PM

Would this lens fit and be usable on my *istDs?

Ole · 11-13-2006, 06:11 PM

The seller states that it is a bayonet mount for Pentax so it will fit. Unless it interferes with the protruding flash housing on the camera...

It will be difficult to focus since the viewfinder will be very dark with an f/8 lens.

Matjazz · 11-14-2006, 02:07 AM

I have a 1100mm f10.5 mirror lens. It is hard to focus but mostly due to unstable tripod I use. When focusing the view shakes quite a bit. With 600mm and f8 this shouldn't be much of a trouble. (I too have DS)

Arpe · 11-14-2006, 04:03 PM

Thanks guys, think I'll give this one a miss. It would be fun to have a really long lens though.

Adam · 11-14-2006, 04:16 PM

Your safest bet would probably be to use a 300 or 400mm with a 2x teleconverter

Arpe · 11-14-2006, 04:35 PM

Yes I'd been thinking about a teleconverter but know absolutely nothing about them. I presume as far as controls etc. go it's exactly the same as not having one on? That is to say exposure and autofocus etc. all behave the same? How much do they slow the lens down by?

Adam · 11-14-2006, 04:53 PM

Let's say you put a 2x teleconverter on a 300mm F4.5 lens- the result would be 600mm F9. I've tried using up to 3 teleconverters: 400x2x2x1.5, and the combo was usable

For everyday tele shots, though, don't use more than one, since they may impact the overall quality.

Adam
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Arpe · 11-14-2006, 11:30 PM

Thanks for the lesson! I didn't realise they'd have such an impact on the speed. Something to ponder on.

Thingo · 11-16-2006, 12:27 AM

With my *istD, I needed to use a decent solid tripod, and ball head, to efectively use a 1000mm f/11 reflex lens, otherwise there was too much vibration to focus. Here's a panorama taken with such a lens. (Apologies for the heat haze.) Tripod used was from Feisol, the 3371, with cb70 ball head. A setup with which I'm very pleased.

Arpe · 11-16-2006, 02:07 AM

Well I'm one step on the way. I do have, what i think, is a decent tripod.

**barondla** · 11-16-2006, 03:57 PM

I had the Sigma 600 f8 for my Olympus OM system years ago. It was a decent lens. Wish I had one for the Pentax. It would pack lots of punch.
thanks
barondla

11-13-2006, 04:48 PM	#1
Arpe Pentaxian Join Date: Sep 2006 Location: New Zealand Photos: Gallery \| Albums Posts: 4,452	Sigma 600mm/8 for istDs? Would this lens fit and be usable on my *istDs?

11-14-2006, 04:16 PM	#5
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,609	Your safest bet would probably be to use a 300 or 400mm with a 2x teleconverter Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

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11-13-2006, 06:11 PM	#2
Ole Administrator Join Date: Sep 2006 Location: Copenhagen, Denmark Photos: Gallery \| Albums Posts: 4,409	The seller states that it is a bayonet mount for Pentax so it will fit. Unless it interferes with the protruding flash housing on the camera... It will be difficult to focus since the viewfinder will be very dark with an f/8 lens.

11-14-2006, 02:07 AM	#3
Matjazz Veteran Member Join Date: Sep 2006 Location: EU/Slovenia Photos: Gallery Posts: 774	I have a 1100mm f10.5 mirror lens. It is hard to focus but mostly due to unstable tripod I use. When focusing the view shakes quite a bit. With 600mm and f8 this shouldn't be much of a trouble. (I too have DS)

11-14-2006, 04:03 PM	#4
Arpe Pentaxian Join Date: Sep 2006 Location: New Zealand Photos: Gallery \| Albums Posts: 4,452 Original Poster	Thanks guys, think I'll give this one a miss. It would be fun to have a really long lens though.

11-14-2006, 04:35 PM	#6
Arpe Pentaxian Join Date: Sep 2006 Location: New Zealand Photos: Gallery \| Albums Posts: 4,452 Original Poster	Yes I'd been thinking about a teleconverter but know absolutely nothing about them. I presume as far as controls etc. go it's exactly the same as not having one on? That is to say exposure and autofocus etc. all behave the same? How much do they slow the lens down by?

11-14-2006, 04:53 PM	#7
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,609	Let's say you put a 2x teleconverter on a 300mm F4.5 lens- the result would be 600mm F9. I've tried using up to 3 teleconverters: 400x2x2x1.5, and the combo was usable For everyday tele shots, though, don't use more than one, since they may impact the overall quality. Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

11-14-2006, 11:30 PM	#8
Arpe Pentaxian Join Date: Sep 2006 Location: New Zealand Photos: Gallery \| Albums Posts: 4,452 Original Poster	Thanks for the lesson! I didn't realise they'd have such an impact on the speed. Something to ponder on.

11-16-2006, 12:27 AM	#9
Thingo Forum Member Join Date: Oct 2006 Location: UFTG, Oz Photos: Gallery Posts: 77	With my istD, I needed to use a decent solid* tripod, and ball head, to efectively use a 1000mm f/11 reflex lens, otherwise there was too much vibration to focus. Here's a panorama taken with such a lens. (Apologies for the heat haze.) Tripod used was from Feisol, the 3371, with cb70 ball head. A setup with which I'm very pleased.

11-16-2006, 02:07 AM	#10
Arpe Pentaxian Join Date: Sep 2006 Location: New Zealand Photos: Gallery \| Albums Posts: 4,452 Original Poster	Well I'm one step on the way. I do have, what i think, is a decent tripod.

11-16-2006, 03:57 PM	#11
barondla Site Supporter Join Date: Sep 2006 Location: midwest, United States Photos: Gallery \| Albums Posts: 5,717	I had the Sigma 600 f8 for my Olympus OM system years ago. It was a decent lens. Wish I had one for the Pentax. It would pack lots of punch. thanks barondla

Sigma 600mm/8 for istDs?

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