[jimr-pdx]

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I've used an SMC M100/2.8 with the Q-S1, it wasn't a good combination.

Bummer! I haven't tried it on my Q, I should give it a spin..

[CWRailman]

The 06 would probably be cheaper than a quality c-mount lens. (I would love to have a few!)

The rubber washer inside the 110 Q adapter only takes a few seconds to install or remove. The fixed aperture isn't that big of a concern, you wouldn't want to stop down the 06 beyond 4.5 anyway.
.

Actually I tried the 110 lenses and the Lens Baby disks first on a Q10 and then later on my Q7's and found the lack of adjustable aperture and auto focus to be more than a little restrictive. I am not one of those who always shoots at maximum aperture but in many cases prefer a good depth of field and having to mess around changing those Lens Baby disks when out in the field was troublesome to say the least. I also found that while the focusing of the 110 lenses is quite smooth they cannot compare to the native lenses in corner to corner sharpness. Again, they are a fascinating diversion which some find rewarding to experiment with but not up to the quality of the native lenses. Since some shooters find the Image Quality of the Q series to already be marginal then I personally would not consider any lens that might detract from that quality no matter how inexpensive it is. If money is tight, save till the proper amount becomes available. You will find that it is well worth the wait. I have actually seen 06 lenses sell on Ebay for as little as $125. In fact there is one on there right now for a buy it now price of $120 plus shipping. Pentax Q 06 Telephoto Zoom 15 45mm F2 8 Excellent from Japan 24 | eBay or this one at $125 Pentax Q 06 Telephoto Zoom 15 45mm F2 8 Excellent from Japan 24 | eBay

Plus, the 06 uses the same 40.5mm lens filters that are used on the 02 and 01 so no need for additional costs in filters and as I believe that you should never leave home without a filter on the lens that extra cost can add up.

[GUB]

Every one has forgotten to mention the 110 70mm for the Q -- giving a result equivalent to about 300mm on apsc. The 70mm looks awesome and has the added bonus of 49mm filter size which means you can hood it up with your standard hoods. Its downside is it doesn't focus very close. Another plus for the 70 is at 70mm it is still a complementary accessory should you choose to also get the 06 which maxs out at 45mm

[pleo]

If not taking the 06 Telezoom I only use 50 - 135 mm lenses on the Q because every lens that is longer is too difficult to handle.
I really prefer the M 3.5/135 for the Q
... in addition to the 06 (15-45)

[CheepShot]

I've had good results with the Nikon Series E 50mm F1.8 and the Industar 50-2 F3.5. Those lenses are cheap, very small and sharp. The 16mm F2.8 Som Berthiot is a no fuss lens and great to walk around with but, not so good for shooting small animals from a distance.

[digital029art]

If you want really compact, check out some of the D mount (vintage movie) lenses. The 1 1/2" (~36mm) varieties are beautifully made of chrome and glass. The f/3.5 versions are cheap and surprisingly really sharp!! With the crop factor, this works out to about the 200mm equivalent range. Just make sure to get one that has a focusing ring - some are fixed focus and that's a pain for telephoto use. Get a $5 D mount adapter and have fun!

[Pioneer]

MS Optical made a very sweet little 25mm lens that is not a lot larger than the standard 8.5mm prime lens. It is not autofocus so you will need to use Live View. It uses the Q mount and does not require an adaptor so it is very compact on the Q7. I am not sure what the price is but this is a description of it. MS Optical Sonnetar 25mm f1.1 Q mount - Japan Camera Hunter