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10-29-2015, 11:23 AM   #1
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What do you think of the Opteka 650-1300mm lens?

I saw this lens, maybe in 2 different versions, and was curious about it. Do any of you have thoughts about it? I know it would be for very specific purposes, but the price point seems inviting. Do any of you think it is worth a try? thanks.

10-29-2015, 11:32 AM   #2
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Above 5-600mm things get tricky photographically (shake, vibration, focus ..) and optically (ie quality). Whats your purpose? there are probably better options like digiscoping or using a high crop factor camera like the Q. That lens is very slow - f16 I think at 1300mm - diffraction already setting in.
if you are just curious I would say don't bother you are only going to be disappointed. (addendum) It's more practical these days to simply crop a pic taken with a good lens of a more reasonable focal length - many decent, value options at 400mm, 500mm.

Last edited by marcusBMG; 10-29-2015 at 03:22 PM.
10-29-2015, 11:33 AM   #3
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I've read several reviews. It's very soft at any aperture. You get what you pay for (usually) and this lens is not simply a "bargain," it is just plain cheap and the chances of getting a satisfactory image are all but non-existent. For a super-bargain telephoto that can give reasonable IQ, try EBAY for a Spiratone 400 f6.3. Very simple, cheap lens with exceed-your-expectations image quality.

Last edited by WPRESTO; 10-29-2015 at 01:26 PM.
10-29-2015, 11:38 AM - 1 Like   #4
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If you need that kind of reach get a telescope and attach it.

10-29-2015, 11:49 AM   #5
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If f2.8 or f4 are better.
10-29-2015, 12:54 PM   #6
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QuoteOriginally posted by WPRESTO Quote
For a super-bargain telephoto that can give reasonable IQ, try EBAY for a Spiratone 400 f6.3. Very simple, cheap lens with exceed-your-expectations image quality.
Yep...there are a lot of variations of this lens, but the general formula of about 400mm and about f/6 simply works. Spiratone sold a lot of these and for good reason.


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10-29-2015, 12:59 PM   #7
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If I remember right, this lens 'zooms' by simply adding a (crappy) 2X teleconverter to it. You're better off tossing the one that comes with and using a bog standard $10-of-eBay vintage TC instead.

From experience with my 400mm and 500mm tubes, the things are way, WAY more effort than they're worth unless you do like I did and get them stupidly cheap on the used market.

For the $200 or so the lens asks for you're far better off just shelling out an extra $100 and getting a Q, or a quality point and shoot, or a good case of whiskey, or.........
10-29-2015, 01:17 PM   #8
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I would just get the Tamron Adaptall 2 500mm f/8 mirror lens. I have been getting some nice results with it and the adaptall TC that comes with it making an effective 500mm and 1000mm lens combo. One or two reviews say it isn't sharp but I have noticed that after bumping up contrast and saturation its a fairly sharp lens. and you could probably find one for $50 without TC

https://www.pentaxforums.com/userreviews/tamron-adaptall-2-sp-500mm-f-8-mirror-55bb.html


Last edited by kmurphy220; 10-29-2015 at 03:06 PM. Reason: I was an A$$! :)
10-29-2015, 01:23 PM   #9
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QuoteOriginally posted by fstop18 Quote
the price point seems inviting.
That's all you really need to know.

To put it in perspective: A good 500mm like the Sigma 500mm f/4.5 costs $5,000 new. The Opteka 650-1300 costs under $200. You do (generally) get what you pay for. But if you have a use for a long lens and not much budget give it a try. I suspect you will be disappointed but then compared to what?

Here are some sample pics on Flicker: https://www.flickr.com/groups/opteka-650-1300/
10-29-2015, 01:44 PM   #10
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If you really want to give a long tube a try just hit Shopgoodwill.com. These pre-set lenses are mostly T-mount, so you can get a K-mount adapter for not much money.

There is a Kalimar 500/8 with a K-mount adapter already on it currently at $12...
10-29-2015, 01:47 PM   #11
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QuoteOriginally posted by kmurphy220 Quote
I would just get the Tokina Adaptall 500mm f/8 mirror lens. I have been getting some nice results with it and the adaptall TC that comes with it making an effective 500mm and 1000mm lens combo. One or two reviews say it isn't sharp but I have noticed that after bumping up contrast and saturation its a fairly sharp lens. and you could probably find one for $50 without TC Tokina 500mm F8 Mirror Lens Lens Reviews - Tokina Lenses - Pentax Lens Review Database
You are confusing Tokina and Tamron. Tamron made the Adaptall, not Tokina. But for a long time Tokina and Tamron made comparable 500mm mirrors that were considered the best on the market. But the Tamron performed better than the Tokina.

Tamron SP Adaptall-2 500mm F/8 Model 55B

Tamron Adaptall-2 SP 500mm f/8 Mirror (55BB) Lens Reviews - Tamron Adaptall Lenses - Pentax Lens Review Database
10-29-2015, 01:51 PM   #12
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QuoteOriginally posted by boriscleto Quote
You are confusing Tokina and Tamron. Tamron made the Adaptall, not Tokina. But for a long time Tokina and Tamron made comparable 500mm mirrors that were considered the best on the market. But the Tamron performed better than the Tokina.
The second version of the Tamron Adaptall 2 is better and one of the best 500 f8 mirror lenses. However the very best, found by a couple of reviews, is the 500 f8 Zeiss Mirotar, but sadly, it cannot be converted from its Leica R or Contax mounts to a K-mount.
10-29-2015, 03:05 PM   #13
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QuoteOriginally posted by boriscleto Quote
You are confusing Tokina and Tamron. Tamron made the Adaptall, not Tokina. But for a long time Tokina and Tamron made comparable 500mm mirrors that were considered the best on the market. But the Tamron performed better than the Tokina.

Tamron SP Adaptall-2 500mm F/8 Model 55B

Tamron Adaptall-2 SP 500mm f/8 Mirror (55BB) Lens Reviews - Tamron Adaptall Lenses - Pentax Lens Review Database
LOLOLOL. I'm an idiot. I knew something was wrong when I typed that post. hahahaha. Good call.The Tamron is what I use and its very nice. and Small.

---------- Post added 10-29-15 at 03:07 PM ----------

QuoteOriginally posted by WPRESTO Quote
The second version of the Tamron Adaptall 2 is better and one of the best 500 f8 mirror lenses. However the very best, found by a couple of reviews, is the 500 f8 Zeiss Mirotar, but sadly, it cannot be converted from its Leica R or Contax mounts to a K-mount.
Yeah the Tamron is pretty much the best mirror lens I have used so far and I would dare to say it's even better than its Minolta Rokkor counterpart. That 500mm has some major contrast and sharpness issues.
10-29-2015, 03:51 PM   #14
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FYI: A Hanimex version of the 400 f6.3 has just come up on equipment for sale. It's an S-mount (M42) so you'd need a K to S adapter, but the seller only wants $30 for it, practically a give-away.
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