Is this for real? PENTAX K MOUNT 500mm f1.8 by Five Star

m8o · 09-24-2007, 08:36 PM

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500mm f/1.8 ? Seriously?!

PENTAX K MOUNT 500mm f1.8 Telephoto Lens L@@K - (eBay item 160161041291 end time Sep-30-07 15:59:40 PDT)

f/1.8? 500mm? That makes for a pretty darn big aperture opening. Is it 'real'? I gotta assume it doesn't do great on Digital tho not having coating, producing a lot of CA and flaring .... ?

frank · 09-24-2007, 09:05 PM

It's probably a 1:8 or F8 lens by the look of it...

Toshi · 09-24-2007, 09:15 PM

I'll second the f/8.

A lot of people who aren't familiar with lenses often make this mistake, such as listing a 50mm 1:2 as a f/1.2.

thePiRaTE!! · 09-24-2007, 09:17 PM

Plus for the ratio to be physically feasible the front element would probably be the size of a manhole cover - and as heavy.

nathancombs · 09-24-2007, 09:22 PM

i agree it is a tipo BUT i did see on youtub that Sigma may put in to perdution a F2.8 100-500 that thing was a BEAST. a Sigma rep was shoing it off at a camera show it evin came with a 2x converter i could use some thing like that

clawhammer · 09-24-2007, 10:15 PM

It looks identical to a Quantaray 500 f/8 that I've got, minus the cool pistol grip with cable-release trigger. It's a pretty crappy lens, slow, and full manual (doesn't even have an automatic aperture, you have to focus with the aperture open, then close it down to meter). btw, my lens came with a 2x doubler that made it a 1000mm lens.

little laker · 09-24-2007, 10:33 PM

It looks the same as my Phoenix 500mm F8 as well.

They're alright for the money, around $100.00 new but I rarely use mine for a reason.
They're too slow, and not the best image quality.

On the other hand, it's extremely lightweight, so I wouldn't be surprised if I use it more during the winter when I'm trying to conserve the weight of my pack more.

little laker · 09-24-2007, 10:39 PM

Originally posted by clawhamemr

btw, my lens came with a 2x doubler that made it a 1000mm lens.

I wonder if that 2x is as lousy as the one with the Phoenix lens.
They'll mess up any shot, and almost doubles the price of the lens.

SupremeMoFo · 09-25-2007, 02:52 AM

Originally posted by nathancombs

i agree it is a tipo BUT i did see on youtub that Sigma may put in to perdution a F2.8 100-500 that thing was a BEAST. a Sigma rep was shoing it off at a camera show it evin came with a 2x converter i could use some thing like that

200, not 100. 200-500 f2.8. Totally impractical, I think it was 18kg.

egordon99 · 09-25-2007, 04:32 AM

Seriously, if it was a f/1.8, the front element would have to be AT LEAST 278mm in diameter. Have you ever seen a Nikon/Canon 200mm f/1.8? That is HUGE! Heck, a 500mm f/4 is huge....My mind hurts just trying to comprehend a 500mm f/1.8

Syb · 09-25-2007, 07:37 AM

I thought: let's be original and think this IS a 500mm/F1:1.8. But you would end up disappointed. So i'll be honest: I would not buy this lens. I have a 400mm/F5.9 that I never use. Too big for its performance. That will be only worse on F/8

Syb

little laker · 09-25-2007, 11:11 AM

There's a quick lens review with it over here
Cheap Super Telephoto Lenses Part III - Handholding a Toyo/Five Star 500mm f/8 lens « Olympus/Zuiko

rdrum76 · 09-25-2007, 11:39 AM

ah ha that seems more like it....is it a mirror at f8??... i emailed the guy...waiting

clawhammer · 09-25-2007, 07:54 PM

If it's the same as mine then it's not a mirror. I havn't shot with mine for two or three years now... Maybe I should pull it out and test it on the K10 shooting the full moon.....

m8o · 09-25-2007, 08:53 PM

Originally posted by little laker

There's a quick lens review with it over here
Cheap Super Telephoto Lenses Part III - Handholding a Toyo/Five Star 500mm f/8 lens « Olympus/Zuiko

Those are some kinda uninspiring pics...

Lol ... I kid. I shouldn't talk... I've taken a fair share of spectacularly ordinary and uninspiring pix w/my 300mm f/2.8 too; not all are like what I share in my Tanzania thread I hold so dear. So I don't mean to insult if anyone has or particularly loves one similar.

Just not too jazzed seeing those examples. I like more color and contrast.

I bet it would do better on a tripod, given the exposure times you'd want stopped down from f/8? I can't imagine that pistol grip does a great job. (does it?)

Sorry all for my ignorance in my OP; it all makes sense. I figured the glass had to be too small. I know f/x is represented that way because it is a ratio, but didn't think it through enough to consider what size of glass was required.

09-24-2007, 08:36 PM	#1
m8o Veteran Member Join Date: Jul 2007 Location: 40°-55'-44" N / 73°-24'-07" W [on LI] Photos: Gallery \| Albums Posts: 3,092	Is this for real? PENTAX K MOUNT 500mm f1.8 by Five Star Staff note: This post may contain affiliate links, which means Pentax Forums may earn a small commission if a visitor clicks through and makes a purchase. If you would like to support the forum directly, you may also make a donation here. 500mm f/1.8 ? Seriously?! PENTAX K MOUNT 500mm f1.8 Telephoto Lens L@@K - (eBay item 160161041291 end time Sep-30-07 15:59:40 PDT) f/1.8? 500mm? That makes for a pretty darn big aperture opening. Is it 'real'? I gotta assume it doesn't do great on Digital tho not having coating, producing a lot of CA and flaring .... ?

09-25-2007, 08:53 PM	#15
m8o Veteran Member Join Date: Jul 2007 Location: 40°-55'-44" N / 73°-24'-07" W [on LI] Photos: Gallery \| Albums Posts: 3,092 Original Poster	Originally posted by little laker There's a quick lens review with it over here Cheap Super Telephoto Lenses Part III - Handholding a Toyo/Five Star 500mm f/8 lens « Olympus/Zuiko Those are some kinda uninspiring pics... Lol ... I kid. I shouldn't talk... I've taken a fair share of spectacularly ordinary and uninspiring pix w/my 300mm f/2.8 too; not all are like what I share in my Tanzania thread I hold so dear. So I don't mean to insult if anyone has or particularly loves one similar. Just not too jazzed seeing those examples. I like more color and contrast. I bet it would do better on a tripod, given the exposure times you'd want stopped down from f/8? I can't imagine that pistol grip does a great job. (does it?) Sorry all for my ignorance in my OP; it all makes sense. I figured the glass had to be too small. I know f/x is represented that way because it is a ratio, but didn't think it through enough to consider what size of glass was required. Last edited by m8o; 09-25-2007 at 08:58 PM.

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09-24-2007, 09:05 PM	#2
frank Veteran Member Join Date: Nov 2006 Location: Singapore Photos: Gallery Posts: 3,202	It's probably a 1:8 or F8 lens by the look of it...

09-24-2007, 09:15 PM	#3
Toshi Veteran Member Join Date: Sep 2006 Location: San Francisco, CA Posts: 431	I'll second the f/8. A lot of people who aren't familiar with lenses often make this mistake, such as listing a 50mm 1:2 as a f/1.2.

09-24-2007, 09:17 PM	#4
thePiRaTE!! Inactive Account Join Date: Sep 2007 Location: Calgary, AB Photos: Gallery Posts: 942	Plus for the ratio to be physically feasible the front element would probably be the size of a manhole cover - and as heavy.

09-24-2007, 09:22 PM	#5
nathancombs Veteran Member Join Date: Jul 2007 Location: Waysboro va Photos: Gallery Posts: 517	i agree it is a tipo BUT i did see on youtub that Sigma may put in to perdution a F2.8 100-500 that thing was a BEAST. a Sigma rep was shoing it off at a camera show it evin came with a 2x converter i could use some thing like that

09-24-2007, 10:15 PM	#6
clawhammer Veteran Member Join Date: Sep 2007 Location: Logan, Utah Photos: Gallery Posts: 971	It looks identical to a Quantaray 500 f/8 that I've got, minus the cool pistol grip with cable-release trigger. It's a pretty crappy lens, slow, and full manual (doesn't even have an automatic aperture, you have to focus with the aperture open, then close it down to meter). btw, my lens came with a 2x doubler that made it a 1000mm lens.

09-24-2007, 10:33 PM	#7
little laker Veteran Member Join Date: Sep 2006 Photos: Gallery Posts: 5,697	It looks the same as my Phoenix 500mm F8 as well. They're alright for the money, around $100.00 new but I rarely use mine for a reason. They're too slow, and not the best image quality. On the other hand, it's extremely lightweight, so I wouldn't be surprised if I use it more during the winter when I'm trying to conserve the weight of my pack more.

09-24-2007, 10:39 PM	#8
little laker Veteran Member Join Date: Sep 2006 Photos: Gallery Posts: 5,697	Originally posted by clawhamemr btw, my lens came with a 2x doubler that made it a 1000mm lens. I wonder if that 2x is as lousy as the one with the Phoenix lens. They'll mess up any shot, and almost doubles the price of the lens.

09-25-2007, 02:52 AM	#9
SupremeMoFo Veteran Member Join Date: Mar 2007 Location: Queensland, Australia Posts: 668	Originally posted by nathancombs i agree it is a tipo BUT i did see on youtub that Sigma may put in to perdution a F2.8 100-500 that thing was a BEAST. a Sigma rep was shoing it off at a camera show it evin came with a 2x converter i could use some thing like that 200, not 100. 200-500 f2.8. Totally impractical, I think it was 18kg.

09-25-2007, 04:32 AM	#10
egordon99 Inactive Account Join Date: Dec 2006 Location: Outside of Philly Posts: 1,561	Seriously, if it was a f/1.8, the front element would have to be AT LEAST 278mm in diameter. Have you ever seen a Nikon/Canon 200mm f/1.8? That is HUGE! Heck, a 500mm f/4 is huge....My mind hurts just trying to comprehend a 500mm f/1.8

09-25-2007, 07:37 AM	#11
Syb Veteran Member Join Date: Aug 2007 Location: Near Utrecht, Netherlands Photos: Gallery Posts: 1,221	I thought: let's be original and think this IS a 500mm/F1:1.8. But you would end up disappointed. So i'll be honest: I would not buy this lens. I have a 400mm/F5.9 that I never use. Too big for its performance. That will be only worse on F/8 Syb

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09-25-2007, 11:11 AM	#12
little laker Veteran Member Join Date: Sep 2006 Photos: Gallery Posts: 5,697	There's a quick lens review with it over here Cheap Super Telephoto Lenses Part III - Handholding a Toyo/Five Star 500mm f/8 lens « Olympus/Zuiko

09-25-2007, 11:39 AM	#13
rdrum76 Inactive Account Join Date: May 2007 Posts: 221	ah ha that seems more like it....is it a mirror at f8??... i emailed the guy...waiting

09-25-2007, 07:54 PM	#14
clawhammer Veteran Member Join Date: Sep 2007 Location: Logan, Utah Photos: Gallery Posts: 971	If it's the same as mine then it's not a mirror. I havn't shot with mine for two or three years now... Maybe I should pull it out and test it on the K10 shooting the full moon.....