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05-19-2014, 08:50 PM   #1
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SMC 645FA 45-85 4.5 lens question

Hi every one, Im new to Pentax and have been investing in some 645 SMC lenses for for a hopefully future purchase of the yet to be released Pentax 645Z.

I purchased a second hand SMC 645 FA 45-85mm 4.5 off ebay that seems to be "near new condition" and in working order.. As I opened the lens up and had a look at it, I noticed the aperture blades are always in the open position despite me turning the aperture ring from closed to open? Now I don't have a Camera to attach this to yet , and Im curious as to weather this lens is always open,until you press the shutter button.?

(please not that when I push on the tab on the rear of the lens, the blades close up (f32) and when I let it go the blade snap back to the open position (f4.5)

Can any one confirm this, or have I just purchased a Dud lens?

Any info would be great.

Thank you

05-19-2014, 10:03 PM   #2
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QuoteOriginally posted by Thomasbrowphoto Quote
Hi every one, Im new to Pentax and have been investing in some 645 SMC lenses for for a hopefully future purchase of the yet to be released Pentax 645Z.

I purchased a second hand SMC 645 FA 45-85mm 4.5 off ebay that seems to be "near new condition" and in working order.. As I opened the lens up and had a look at it, I noticed the aperture blades are always in the open position despite me turning the aperture ring from closed to open? Now I don't have a Camera to attach this to yet , and Im curious as to weather this lens is always open,until you press the shutter button.?

(please not that when I push on the tab on the rear of the lens, the blades close up (f32) and when I let it go the blade snap back to the open position (f4.5)

Can any one confirm this, or have I just purchased a Dud lens?

Any info would be great.

Thank you
To facilitate open-aperture metering, the aperture diaphragm only closes to the desired setting when the aperture lever is pushed down. So there's nothing wrong with your lens

Adam
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05-19-2014, 10:53 PM   #3
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Thank you Adam. I thought that something like that was the case.

Tom
05-20-2014, 04:43 AM   #4
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If you want to see the aperture stopping down, there are two levers on the butt of the lens. One moves as you rotate the aperture ring. The other one doesn't but if you move it with your finger you'll see the blades stop down to whatever setting you've selected.

05-20-2014, 08:21 AM   #5
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i was late getting your pm, but concur with the responses here. good luck building the stash of lenses!
05-20-2014, 10:22 AM   #6
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QuoteOriginally posted by Thomasbrowphoto Quote
Hi every one, Im new to Pentax and have been investing in some 645 SMC lenses for for a hopefully future purchase of the yet to be released Pentax 645Z.
I'm in the same boat (although I already have a 645N). But in recent weeks I've been able to pick up 5 lenses to add to the 3 I already have. I'm ready. Even have a flash and a remote (if it works...).
05-20-2014, 03:16 PM   #7
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Thanks for the responses, I had a slight idea that this was standard for a Pentax Lens but wanted to double check.
Cheers Tom

---------- Post added 05-21-14 at 08:18 AM ----------

QuoteOriginally posted by texandrews Quote
I'm in the same boat (although I already have a 645N). But in recent weeks I've been able to pick up 5 lenses to add to the 3 I already have. I'm ready. Even have a flash and a remote (if it works...).

Nice one mate,

What lenses do you have in your kit?

Im planning on getting a SMC645 120FA f4 MACRO, and the SMC645 A 35mm (widest you can go I'm told) with out getting the expensive 25mm.

Cheers Tom
05-20-2014, 07:48 PM   #8
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QuoteOriginally posted by Thomasbrowphoto Quote
Nice one mate,

What lenses do you have in your kit?

Im planning on getting a SMC645 120FA f4 MACRO, and the SMC645 A 35mm (widest you can go I'm told) with out getting the expensive 25mm.

Cheers Tom
I already had a 45 f2.8 A series, a 75 f2.8 FA, and a 150 A. I got these last year in a great deal on a 645N kit at my local pro shop, just 2 blocks away from me(they get a lot of trade -ins). This last few weeks I've been able to pick up the A series 35 and 120 macro from the same shop. Then I joined up here after the news of the 645Z broke---with the price, which suddenly made it a painful stretch, but do-able if I shed some gear (which will involve another kind of pain). From the marketplace here I was immediately able to get a hold of an A series 75 LS, a lens I'd missed getting a while back, and a very rare Hartblei 45 Shift only. And then the last purchase was a near mint in box 45-85 FA off Ebay. I think I managed to get all 8 lenses for less than $1,800.00 usd. I don't have much interest in tele, so I think I'm ready. That 25 will have to wait a while, but that's ok, as I'm not shooting so much wide lately, and the 35 will be fine I think.

Good luck to you! tex

05-21-2014, 08:01 PM   #9
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The 45 - 85 is a great lens. Mine was damaged when my sun sniper screw in strap disconnected and the camera hit the hard floor. It's nt as sharp as it once was so suspect the elements are out of line. Need to decide whether it is worth sending in for a repair or whether to buy a another used one.
05-22-2014, 10:22 AM   #10
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I notice that a few posters here on the forums are picking up lenses in anticipation of adding a digital body - so I'm wondering what a fair price for the SMC 645FA 45-85 4.5 lens is?

---------- Post added 05-22-14 at 10:38 AM ----------

I should have mentioned - I'm asking about a used lens in mint condition....
(sorry but I could not edit my above post to include this last bit of info as I'm so new to the forums)
Thanks for understanding.
05-22-2014, 04:18 PM   #11
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QuoteOriginally posted by BackWithPentax Quote
I notice that a few posters here on the forums are picking up lenses in anticipation of adding a digital body - so I'm wondering what a fair price for the SMC 645FA 45-85 4.5 lens is?

---------- Post added 05-22-14 at 10:38 AM ----------

I should have mentioned - I'm asking about a used lens in mint condition....
(sorry but I could not edit my above post to include this last bit of info as I'm so new to the forums)
Thanks for understanding.
Well, of course there's that condition question, and accompanying parts. I got mine, MIJ, with original box, original warranty cards, "manual", case(funny soft case, kinda cool), caps, and hood, all but the box and hood just about mint, with just a couple of scuffs on the matte part of the inside of the hood, for $400 on Ebay from Jack's camera in Muncie Indiana (they were great to deal with, but I don't know that they are Pentax medium format specialists...). Based on what I've seen, that was a good deal. You can get them for less, but watch out for the hood: they can be hard to find separately, and run about $65 when I've seen them.

Last edited by texandrews; 05-22-2014 at 04:19 PM. Reason: added information
05-22-2014, 04:34 PM   #12
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Here is yesterday's listing at Fujiya Camera. They have a couple of the FA version for $410 and the A version for $320.
05-24-2014, 10:05 PM   #13
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I'm looking for a hood for my used FA 45-85mm and they are hard to come by. If you buy an FA 45-85mm, make sure you get one with the hood.
05-26-2014, 12:33 PM   #14
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QuoteOriginally posted by robertchow999 Quote
I'm looking for a hood for my used FA 45-85mm and they are hard to come by. If you buy an FA 45-85mm, make sure you get one with the hood.
PM sent re: extra 45-85mm hood
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