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06-27-2010, 10:17 AM   #1
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500mm -800mm

Good -day , I am currently using the SMC Pentax-DA* 300mm F4 awesome lens by the way , and I am looking to upgrade to a 500mm -800mm. Any suggestions would be appreciated I am using the k20 Thanks Rob

06-27-2010, 10:34 AM   #2
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What will you be using it for? Need autofocus?
06-27-2010, 10:36 AM   #3
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A good place to start is with Bojidar Dimitrov's Pentax K-Mount PageIn terms of telephoto lenses beyond 300mm, Pentax really is not that strong - in current lenses. In the past, they carried special order lenses which have a wonderful reputation and price. As a place to start, go through Bojidar's pages (which he keeps up to date) looking for older glass that interests you, and then its a hunt to find it. There is also Stan's Pentax site which covers older lenses and is somewhat out of date.There is also the Forum's Lens database that is a goldmine.Then there are the obvious alternatives - Sigma and Tamron. In the past Tokina had a good 80 - 400mm lens in a Pentax mount, but that is also difficult to find.

Earlier this year I came across a 600mm Pentax and it was going for about $2K+. Also, earlier this year an older 1200mm went for about $9.5K. So they are out there - its just the Quest!!

.... and then this was just posted!


Last edited by interested_observer; 06-27-2010 at 10:58 AM.
06-27-2010, 11:35 AM   #4
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QuoteOriginally posted by interested_observer Quote
In terms of telephoto lenses beyond 300mm, Pentax really is not that strong - in current lenses.
Not that strong?
They have NO current lenses over a 300mm f4 ... criminal that a company of Pentax's pedigree should come up so short.

You have to start looking at Sigma for longer.

06-27-2010, 11:53 AM   #5
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Check the lens databases at Pentax Lens Review Database - Lens Listings

You'll likely want a used FA* lens, or a third-party lens.
06-27-2010, 12:07 PM   #6
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QuoteOriginally posted by Mike.P Quote
Not that strong?
OK, I'll be more blunt - They Aint Got None!! - Nada, Zilch, Goose Egg, Zero, the cupboard is bear.
06-27-2010, 01:07 PM   #7
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I would suggest to visit the 300mm plus lens club: https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/55946-300mm-pl...ng-lenses.html

It is a long thread and growing, but you will find a lot of helpful info here, which will allow you to narrow down your requirements.

Ben
06-27-2010, 03:55 PM   #8
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There's the Sigma 50-500mm (bigma). That's going to be your cheapest option in a single glass lens. You can always go with a DA* or FA* 300 and add teleconverters.

From there your options get more limited. There's the cheap generic mirror lenses and the really cheap glass. I dont have those, but they aren't generally recommended around the forums.

If you want to spend piles of cash, Sigma has some additional offerings, and there's older and expensive pentax glass such as the FA* 400mm, FA* 600mm, and FA* 250-600mm.

The only one of these I know where to get currently is the FA* 600mm at tristate camera: Pentax | Fa 600/4.0 Ed If | | Tri-State Camera, Video, and Computer

This may also catch your interest:
https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/96450-if-you-c...d-you-buy.html

I put up this poll a while ago, and while it doesn't cover all the teleconverter options, I think it covers most of the lenses.


Last edited by Clinton; 06-27-2010 at 04:08 PM.
06-27-2010, 04:34 PM   #9
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QuoteOriginally posted by interested_observer Quote
Also, earlier this year an older 1200mm went for about $9.5K. So they are out there - its just the Quest!!
One was listed on ebay last week for $7300 (for a single day) I'm guessing it sold quickly.
06-27-2010, 05:31 PM   #10
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I shoot with a 900 mm f 7.5 telescope. It has 2 lenses in one group, is ED and only cost $ 1800.
Pretty cheap, just lacks aperture control, but being f 7.5 who cares.
06-28-2010, 07:19 AM   #11
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I dont know whether it is an indication of something, but two persons have asked for my comments on the Sigma 500/4,5 recently.
Maybe the demand for long glass is on the increase.
Nevertheless, if you are looking for a lens in this focal range, this one is worth serious consideration. In terms of optical performance it is the best of Sigmas current supertele prime range (300/2,8;500/4,5;800/5,6).
You might want to have a look in the lens review seciton of this forum, or on this thread:
https://www.pentaxforums.com/forums/pentax-slr-lens-discussion/59187-sigma-50...est-shots.html
06-28-2010, 07:49 AM   #12
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QuoteOriginally posted by Ex Finn. Quote
I shoot with a 900 mm f 7.5 telescope. It has 2 lenses in one group, is ED and only cost $ 1800.
Pretty cheap, just lacks aperture control, but being f 7.5 who cares.
Refractor or reflector?

I've seen some people shooting with Celestron reflectors combined with T-mount adapters. (Just because it's a mirror lens doesn't mean it's bad - Unfortunately it's hard to find a quality mirror lens.)
06-28-2010, 04:42 PM   #13
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800mm f4 for a 6x7 camera (there are adapters), all 17.7kg of it:

Very Rare TAKUMAR Asahi Pentax 800mm F4 C Mount & T6-2X - eBay, Lenses, Photographic Accessories, Cameras. (end time 04-Jul-10 21:05:03 AEST)
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