Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
10-22-2007, 08:35 AM   #1
Senior Member
azcavalier's Avatar

Join Date: Oct 2007
Location: Blacksburg, VA
Photos: Gallery
Posts: 135
Someone tell me this was a good buy...Tokina 75-300mm f/4.5-5.6

I just bought a Tokina SZX 730 75-300mm f/4.5-5.6 lens off of eBay for about $130. It was listed as new, even though this is an older manual focus lens. Am I correct in thinking that since it was made for a 35mm film camera, that the length on this lens will be more like 450mm on my K10D? Does anyone know anything about this lens? I did a search on the forum before I bought it, and didn't see much. I also don't know what Tokina's reputation is as far as the quality of their lenses.

10-22-2007, 08:59 AM   #2
Veteran Member




Join Date: Dec 2006
Location: Outside of Philly
Posts: 1,564
Well for about $30 more, you could have had a brand new AUTOFOCUS Tamron 70-300mm.
Tamron Zoom Telephoto 70-300mm f/4-5.6 Di LD Macro 1:2 Autofocus Lens for Pentax AF (AF017P-700) -

So I'd say you didn't really get that great of a deal. Sorry!
10-22-2007, 09:05 AM   #3
Senior Member




Join Date: Aug 2007
Location: Oakland, CA
Posts: 131
For the field of view it provides, it doesn't matter whether the lens was made for a film camera or not. A 300mm lens originally made for a film camera but placed on a digital body will have the same field of view as a 300mm "digital" lens on the same digital body. This is a function of the sensor size on most digital SLRs being smaller than film. Both lens will provide the same equivalent field of view on the K10 as a 450mm on a 35mm film body. The only difference is that the digital lenses are smaller, more compact and generally more likely to vignette, and although you can use either lens on a digital body, you can't really use the digital lens on a film body without severe vignetting. I have a little more detailed explanation of the topic in this post.

As for the particular Tokina lens...sorry, I don't know anything about it.

Alex
10-22-2007, 09:12 AM   #4
Senior Member
azcavalier's Avatar

Join Date: Oct 2007
Location: Blacksburg, VA
Photos: Gallery
Posts: 135
Original Poster
QuoteOriginally posted by egordon99 Quote
Well for about $30 more, you could have had a brand new AUTOFOCUS Tamron 70-300mm.
Tamron Zoom Telephoto 70-300mm f/4-5.6 Di LD Macro 1:2 Autofocus Lens for Pentax AF (AF017P-700) -

So I'd say you didn't really get that great of a deal. Sorry!
Well, but my whole point was that this is an old film lens, put on a digital body, which gives me an equivalent range of about 112-450mm on the digital (I think). I'm not looking for a 300mm lens. I want something with a longer reach than that. I have the Tamron 18-200mm lens, and I didn't want to spend the $$$ for just a 300mm lens. But thanks for the opinion!

10-22-2007, 09:15 AM   #5
Veteran Member




Join Date: Sep 2006
Photos: Gallery
Posts: 5,713
I believe that the Tokina is a better lens than the Tamron so I wouldn't worry about the new Tamron only being a few more dollars for a new lens.

However I don't know if you got a good deal on it.

here's the specks page
Tokina SZX 730 75-300
10-22-2007, 09:16 AM   #6
Senior Member
azcavalier's Avatar

Join Date: Oct 2007
Location: Blacksburg, VA
Photos: Gallery
Posts: 135
Original Poster
QuoteOriginally posted by gerbilbox Quote
For the field of view it provides, it doesn't matter whether the lens was made for a film camera or not. A 300mm lens originally made for a film camera but placed on a digital body will have the same field of view as a 300mm "digital" lens on the same digital body. This is a function of the sensor size on most digital SLRs being smaller than film. Both lens will provide the same equivalent field of view on the K10 as a 450mm on a 35mm film body. The only difference is that the digital lenses are smaller, more compact and generally more likely to vignette, and although you can use either lens on a digital body, you can't really use the digital lens on a film body without severe vignetting. I have a little more detailed explanation of the topic in this post.

As for the particular Tokina lens...sorry, I don't know anything about it.

Alex
Alright, now you've lost me. I guess what I want to know is, if I put this 300mm film lens on a digital body, what will my focal length equivalent be? 450mm, right? Because that's what i'm shooting for. And, by using this lens on my digital camera body, is this a longer focal length than if I put a 300mm "digital" lens on my digital camera body? Or is it the same? Is that what you're saying? Because I always thought that if you could find older film lenses for your digital camera, you were getting more "bang for your buck" as it were. That you could take advantage of the fact that the sensor is smaller than film, so you extended your reach by 1.5.
10-22-2007, 09:19 AM   #7
Veteran Member
Tom M's Avatar

Join Date: Aug 2007
Location: Lincoln Park, NJ
Photos: Gallery
Posts: 782
A 300mm lens on a 1.5x crop factor sensor like that of the Pentax will provide a FOV (Field of View) equal to that of a 450mm of a 35mm camera.

No, you will not gain any magnification. A 450mm lens has a narrower FOV than that of a 300mm lens on a 35mm camera however, that 300mm will have the same FOV as the 450mm on a APS-C sized sensor.

Essentially, lenses designed for FF cameras lose some usefulness due to the fact that the small APS-C sensor can only 'see' some of the image the lens is capable of producing.

For Pentax users the answer is for Pentax to produce a full-frame sensor camera that can really take advantage of all the old glass plus newly developed glass. Currently, this myth that all Pentax lenses ever produced work on the new DSLR's is misleading. Yes, technically they work, however, they are severely limited.
10-22-2007, 09:20 AM   #8
Senior Member
azcavalier's Avatar

Join Date: Oct 2007
Location: Blacksburg, VA
Photos: Gallery
Posts: 135
Original Poster
QuoteOriginally posted by little laker Quote
I believe that the Tokina is a better lens than the Tamron so I wouldn't worry about the new Tamron only being a few more dollars for a new lens.

However I don't know if you got a good deal on it.

here's the specks page
Tokina SZX 730 75-300
Thanks. I had seen the specs page, but it didn't really tell me much more than I already knew. I have an 18-200mm Tamron, which is my main lens, and I do like it alot, but I have heard a couple of people say that they thought that Tamron had a bit of a bad repuation for being cheap. However, I do like mine. I have seen some ads for Tokina lenses, but I don't know anyone who actually has one. So I don't know much about their quality.

10-22-2007, 09:21 AM   #9
Veteran Member




Join Date: Sep 2006
Photos: Gallery
Posts: 5,713
QuoteOriginally posted by azcavalier Quote
if I put this 300mm film lens on a digital body, what will my focal length equivalent be? 450mm right?
Right

QuoteQuote:
And, by using this lens on my digital camera body, is this a longer focal length than if I put a 300mm "digital" lens on my digital camera body? Or is it the same?
It would be the same. They haven't changed the lens sizes since they switched to Digital.
10-22-2007, 09:24 AM   #10
Senior Member
azcavalier's Avatar

Join Date: Oct 2007
Location: Blacksburg, VA
Photos: Gallery
Posts: 135
Original Poster
QuoteOriginally posted by little laker Quote
Right


It would be the same. They haven't changed the lens sizes since they switched to Digital.
So, a 300mm digital lens and camera is the same as a 450mm lens on a film camera. But if I take that film lens and throw it on my digital camera, it's the exact same as a digital lens as far as focal length goes? Hmmm....I may have to spring for a 2x extender.

I don't suppose that someone has a Bigma that they want to sell me on the cheap?
10-22-2007, 09:26 AM   #11
Veteran Member




Join Date: Sep 2006
Photos: Gallery
Posts: 5,713
I have 2 Tokina lenses, and have gotten a few breathtaking photos with them.

Although they aren't that actual lens.

I don't use them very often, but that'll change pretty quick. Since they're the first lenses to get packed in my bag in the winter.
They're both small and light weight, yet good quality.
10-22-2007, 09:40 AM   #12
Veteran Member




Join Date: Dec 2006
Location: Outside of Philly
Posts: 1,564
Like we told you on the other thread, FOCAL LENGTH IS FOCAL LENGTH, doesn't matter what format it is for. 10mm is 10mm. 300mm is 300mm. If you don't have any experience with 35mm film, IGNORE THE "EQUIVALENT" FOCAL LENGTH!
10-22-2007, 10:16 AM   #13
Senior Member




Join Date: Aug 2007
Location: Oakland, CA
Posts: 131
QuoteOriginally posted by azcavalier Quote
So, a 300mm digital lens and camera is the same as a 450mm lens on a film camera. But if I take that film lens and throw it on my digital camera, it's the exact same as a digital lens as far as focal length goes? Hmmm....I may have to spring for a 2x extender.

I don't suppose that someone has a Bigma that they want to sell me on the cheap?
I fail miserably at explaining these things.

Yes, you are correct.

Any 300mm lens (digital or not) on any of the Pentax's current digital SLR bodies will produce the same telephoto view as (equivalent to) a 450mm lens on a 35mm film SLR camera. That is essentially what it boils down to.

Alex
10-22-2007, 10:28 AM   #14
Senior Member




Join Date: Aug 2007
Location: Oakland, CA
Posts: 131
QuoteOriginally posted by egordon99 Quote
Like we told you on the other thread, FOCAL LENGTH IS FOCAL LENGTH, doesn't matter what format it is for. 10mm is 10mm. 300mm is 300mm. If you don't have any experience with 35mm film, IGNORE THE "EQUIVALENT" FOCAL LENGTH!
I have been trying, although I haven't been successful at it here, to carefully use the word "equivalent." That's the one thing I've really been torn over in explaining this issue, since focal length doesn't change no matter what body you slap a lens on, but that doesn't say anything about field of view, which is what people are asking about.

Alex
10-22-2007, 11:19 AM   #15
Senior Member
azcavalier's Avatar

Join Date: Oct 2007
Location: Blacksburg, VA
Photos: Gallery
Posts: 135
Original Poster
QuoteOriginally posted by egordon99 Quote
Like we told you on the other thread, FOCAL LENGTH IS FOCAL LENGTH, doesn't matter what format it is for. 10mm is 10mm. 300mm is 300mm. If you don't have any experience with 35mm film, IGNORE THE "EQUIVALENT" FOCAL LENGTH!
Hey, don't yell at me. What thread was I told this? Don't remember ever asking the question, nor looking at a thread about it.
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
f/4.5-5.6, k-mount, lens, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Tamrom SP 300mm f/2.8 (60B) or Tokina 300mm f/2.8 STX2 tunarudi Pentax SLR Lens Discussion 8 05-02-2010 08:08 AM
Should I be a good Pentax choirboy and buy a DA 15 Limited or buy the Sigma 10-20mm? tokyoso Pentax SLR Lens Discussion 42 03-14-2010 04:54 PM
would this be a good buy simons-photography Pentax SLR Lens Discussion 3 05-30-2009 12:12 AM
For Sale - Sold: Tokina 20-35mm f2.8 AT-X Pro, Tokina 28-80mm f2.8 AT-X Pro, Tokina 100-300mm f photobizzz Sold Items 7 01-30-2009 06:04 PM
For Sale - Sold: FS: Tokina 17mm, Tokina 100-300mm, Sigma 28-200mm time-snaps Sold Items 2 07-24-2007 03:47 PM



All times are GMT -7. The time now is 02:07 PM. | See also: NikonForums.com, part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top