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01-01-2017, 01:32 AM   #16
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This is what I had for the OM film cameras - really compact and light



So, probably the reason the DSLR lenses are so long and heavy is because they need to bend the light so it strikes the sensor more or less square-on.

01-01-2017, 01:40 AM   #17
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QuoteOriginally posted by Digitalis Quote
Under 400g? HA! If pentax ever makes a 20mm f/1.8 will weigh in the vicinity of 500~700g. Personal;ly I'd prefer it to be heavier, as weight is indicative* that there are more corrective elements in use in the optical design - which are a necessity with wide angle lenses to reduce coma,astigmatism, controlling field curvature which all become increasingly problematic with wide lenses

*but by no means a infallible indicator
I do have a Nikkor 20mm f/1.8 ED at 357g. 13 elements in 11 groups with 2 aspherical and 2 ED elements plus silent wave AF motor. Field curvature is what youʻd expect, but nothing that canʻt be corrected in PP. 77mm filter size, so itʻs not a small prime. For me, it balances nicely with the D750.
01-01-2017, 09:33 AM   #18
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K18/3.5? (295g)

Phil.
01-01-2017, 05:51 PM   #19
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QuoteOriginally posted by peterh337 Quote
This is what I had for the OM film cameras - really compact and light



So, probably the reason the DSLR lenses are so long and heavy is because they need to bend the light so it strikes the sensor more or less square-on.
It used to be available in Pentax mount, onced very common in Europe.
Very rare showing up on AU used market, in US , I do not know but the average price is US$92 so can not be too rare
Tokina ( SL17 / RMC ) 17mm f/3.5 Lens Reviews - Tokina Lenses - Pentax Lens Review Database

01-02-2017, 01:25 AM   #20
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It is on Ebay now
17mm Pentax PK Fit Tokina Lens, Filter Thread Damage. Digital OK, Others Listed
Presumably this would work on a K1 but only in M mode?
01-02-2017, 01:35 AM   #21
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QuoteOriginally posted by peterh337 Quote
It is on Ebay now
17mm Pentax PK Fit Tokina Lens, Filter Thread Damage. Digital OK, Others Listed
Presumably this would work on a K1 but only in M mode?
indeed
01-02-2017, 04:31 AM   #22
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Agree about the size of the 15-30, I briefly tried one, I can't fault its IQ but the sheer size was off-putting and the lack of a filter thread meant I'd be needing to spend over £500 on a new holder and a basic set of filters.

Instead I acquired a Pentax 20mm f2.8 FA which seems to be very good on the K1, certainly enough for the limited amount of wide shoot I do, size comparison here:

01-02-2017, 05:11 AM   #23
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That's interesting - many thanks. That also gives you autofocus and possibly (?) camera-selectable aperture. Not many for sale however.

From my perspective, I would use a wide angle rarely so carrying around a 1kg lump is not good. I shoot everything with the 24-70 (have a 70-300 Tamron at home for the moon etc) and carrying any extra lens is a significant hassle. So I want something small.

01-02-2017, 05:38 AM   #24
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The most compact ultra-wide will surely be the Voigtländer Color Skopar 20mm F/3.5. Fits everywhere, not without compromises but can do magic as well, see the sample pictures. I really don't miss auto-focus in that range.
01-02-2017, 05:51 AM   #25
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QuoteOriginally posted by JensE Quote
The most compact ultra-wide will surely be the Voigtländer Color Skopar 20mm F/3.5. Fits everywhere, not without compromises but can do magic as well, see the sample pictures. I really don't miss auto-focus in that range.
Gorgeous lens...almost fits in your coin pocket.... really compliments the DFA 150-450.... for when size does matter.... either way!
01-02-2017, 11:00 AM   #26
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M 20mm f4 is also small. Seems somewhat rare and hasn't been sold brand new in a long time.

The wide FF prime situation is currently somewhat of a negative in the land of k-mount. If a K-1 fell from the sky and into my hands I would probably take a few long walks trying my 15 Limited in crop to see what that felt like. I know, pixel density in crop no better than the K-5, but at least there's this nice little solution that sell for noticeably less than FA20's on the used market.

Hopefully Papa Ricoh drops something interesting soon to remedy the situation. DFA 19 f2.x anyone?
01-02-2017, 12:18 PM   #27
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That is however likely to be a 800 gram lens and almost as big as the 24-70 f2.8 monster

Pentax will never bring out any FF lens which doesn't get totally stellar reviews, so whatever they do will be big, heavy and very pricey.

It's funny that I paid £250 for the Tokina (OM mount) 30 years ago and they go for the same today. I sold it on Ebay c. 10 years ago when I sold all my OM film stuff and got about £150 for it but the buyer (in Spain) gave me dirty feedback, saying it was full of mould and oil, which could not have been true.
01-02-2017, 02:21 PM   #28
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Pentax has a number of full frame lenses that review well, are not large nor heavy, and are comparatively reasonably priced. FA 35 and 50 come to mind immediately. The old FA 20 is quite small as well for what it provides. Maybe you typo'd "Sigma" or something.
01-02-2017, 03:18 PM   #29
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Here is one FA 20 for €1000!
Pentax FA SMC 2.8/20 mm #4970417 Lens | eBay
01-02-2017, 07:14 PM   #30
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There isn't a 17-18mm lens that is compact, high quality and relatively cheap.

The old 17-18mm of old film days are not good enough on the edges if one is looking for an "all sharp at f8" lens.
Thats the Pentax 18, Tokina/Vivitar/Tamron 17mm

I do think the Pentax 20mm work well enough in most cases and are not too big (the M20/4 is tiny in fact), but YMMV (esp wrt what is needed for edges)
There is also that Voigtlander 20mm (about the same compromises as the M20/4).

Unfortunately, modern UWA offerings are largely fast aperture, hence big and often heavy.
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